Top stops in mid-cycle while being raised

rwd · Jul 20, 2010

The car is a 2008 XLR and was supposed to have had the updated top software installed last year.

Recently, after retracting without problem, when the top was raised, there was a continuous loud grinding or whine from the driver's side of the trunk while the switch was pressed, but the top secured properly.

Later, the top was lowered to check operation, and the same sound occurred, but it was stored correctly.

When an attempt was made to raise it, however, the mechanism locked with the trunk up, but before the top began to raise. The direction was reversed and it stored correctly. On the final attempt to raise it, it stopped at the same place, but when reversed, it did not fully retract. A 'top not secure message' appeared, and it has been the only message.

Currently, the center front tonneau cover is jammed against the roll bars and may be being held there by the quarter glass windows. While somewhat concealed, the windows appear to be higher than expected and their tops are tight against the underside of the center tonneau cover.

The trunk lid is closed, but whether it did so as part of the cycle or via the trunk button is unknown.

Any information, including any specific potential sensor involvement and whether all sensors have the same part number would be helpful.

JT112673 · Jul 20, 2010

Sounds like a Dealership visit to me... I just dropped mine off in Boulder to have them see what they can do to get my top to work... It just stopped working like there was no fluid in the system, yet it's full and no leaks... go figure. I'm guessing bad pump.

onalaska · Jul 20, 2010

Must be that time of year. I tried lowering the top at the restaurant we were at. Mine also stuck, but without the grinding. The trunk opened, the center front tonneau opened and it stopped. Wouldn't open or close from there. I can hear the pump running, but it appeares to be locked. I opened the valve on the pump to release the pressure, but coudn't close the trunk. While trying to figure out how I was going to get home with the trunk open I heard a click and then could lower the trunk lid. Started driving, but the top not secure message was on the DIC. I pulled over and manually latched the top and drove home with no visibility through the rear view mirror since the tonneau never would close. Calling the dealer tomorrow.

rwd said:
The car is a 2008 XLR and was supposed to have had the updated top software installed last year.

Recently, after retracting without problem, when the top was raised, there was a continuous loud grinding or whine from the driver's side of the trunk while the switch was pressed, but the top secured properly.

Later, the top was lowered to check operation, and the same sound occurred, but it was stored correctly.

When an attempt was made to raise it, however, the mechanism locked with the trunk up, but before the top began to raise. The direction was reversed and it stored correctly. On the final attempt to raise it, it stopped at the same place, but when reversed, it did not fully retract. A 'top not secure message' appeared, and it has been the only message.

Currently, the center front tonneau cover is jammed against the roll bars and may be being held there by the quarter glass windows. While somewhat concealed, the windows appear to be higher than expected and their tops are tight against the underside of the center tonneau cover.

The trunk lid is closed, but whether it did so as part of the cycle or via the trunk button is unknown.

Any information, including any specific potential sensor involvement and whether all sensors have the same part number would be helpful.

monepit · Jul 21, 2010

Mine did the same thing when I bought it. I swore it was a bad pump. Turned out boath times it was a position sensor. Also, when you loosen the screw on the pump it takes about 30 seconde till you can move thins. I dont know why but mine always did. You can also lower the little door in front of the back window manualy then too. BTW, all sensors have the same part number.

Cadillac Tech · Jul 24, 2010

2008 Cadillac XLR | XLR (VIN Y) Service Manual | Document ID: 2234169 <HR>
#03-08-67-008D: Diagnostic Information and New Software for Power Folding Top/Roof - Stops Mid-Cycle, Deck Lid (Trunk) Inoperative, Intermittent Top Not Secure Message on DIC with No DTCs Set - (Feb 12, 2009)

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Subject:</TD><TD vAlign=top>Diagnostic Information and New Software for Power Folding Top/Roof -- Stops Mid-Cycle, Deck Lid (Trunk) Inoperative, Intermittent "Top Not Secure" Message On DIC With No DTCs Set</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top width=100>Models:</TD><TD vAlign=top>2004-2009 Cadillac XLR, XLR-V</TD></TR></TBODY></TABLE>

<HR>This bulletin is being revised to add the 2009 model year. Please discard Corporate Bulletin Number 03-08-67-008C (Section 08 -- Body & Accessories).

<HR>This bulletin provides diagnostic information for a power folding top that exhibits the following conditions:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The power folding top stops mid-cycle.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The deck lid is inoperative.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>A "TOP NOT SECURE" message may be displayed on the Driver Information Center (DIC).</TD></TR></TBODY></TABLE>

Technicians may find that no Diagnostic Trouble Codes (DTCs) have been set.
<A href="#ss1-2234169">Diagnostic Information For Intermittent Folding Top Operation

Intermittent concerns with top operation that do not set a DTC can possibly be related to top position sensors that read a position incorrectly. In such cases, the top will operate to a point and will not advance and complete the operation. In these cases, the pump will continue to run up to 15 seconds as long as the top control switch is depressed.
The top operates in a sequence of steps: the first step must be completed before the second step can start. The folding top control module reads the limit switches and position sensors (potentiometers) in order to determine if one step is complete and the next step can begin.
In order for a technician to diagnose a concern, it is important to assess and record the position of the top parameters where the roof stops (the location in the top operation sequence) and is unable to complete the cycle. It is also important to know the direction of operation, moving from top closed (coupe) to top open or moving from top open (convertible) to top closed.
Important: Performing a relearn procedure on the Folding Top Control (FTC) module will reset all of the reference parameters and the top will usually function again but the root cause of the concern will not have been corrected.
<A href="#ss2-2234169">Sequence for Opening the Folding Top

Before any movement of the folding top toward the open position is allowed, the following conditions must be met or top operation will be inhibited:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The cargo cover must be pulled or extended into position (Luggage Barrier Limit Switch Closed).</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Verify that the hydraulic pump bypass valve at the motor is in the operating position by turning the valve clockwise.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The valet switch is off/inactive, it is located inside the instrument panel compartment on the left side of the compartment.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The power windows are normalized, refer to Reinitialization of the Power Windows.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The vehicle is in PARK.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The ignition is in ACCESSORY or RUN.</TD></TR></TBODY></TABLE>

To cycle the top from the closed/coupe position to the open/convertible position, press the folding top control switch to the open direction and hold. The folding top status changes to Opening and the following steps will then take place:

<LI type=1>The windows will express open (if closed).
The front tonneau (three piece closure behind the seats) opens. The header latch unlatches. This latch is located in the middle forward area of the roof panel. The deck lid/trunk lid opens. Tip

If the top operation will not advance past Step 2, it is possible that:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Front Tonneau Position Sensor value at or above the Front Tonneau Open Reference Position Value.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Header Latch Limit Switches as Unlatched.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Deck Lid Ajar Status and Deck Lid Latch Switch as Deck Opened.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Deck Lid Extended as Active.</TD></TR></TBODY></TABLE>

<LI type=1>The top opens (roof retracts into the trunk). Tip

If the top will not advance past Step 3, it is possible that the FTC module is not reading the Folding Top Position Sensor value at or below the Folding Top Open Reference Position value.

<LI type=1>The rear tonneau (the retracted panel below the deck lid) extends. Tip

If the top will not advance past Step 4, it is possible that the FTC module is not reading the Rear Tonneau Position Sensor value at or below the Rear Tonneau Closed Reference Position value.

<LI type=1>The front tonneau closes. The header latch latches, securing the roof panel with the structure behind the seats. Tip

If the top operation will not advance past Step 5, it is possible that:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Front Tonneau Position Sensor value at or below the Front Tonneau Closed Reference Position value.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Header Latch Limit Switches as Latched.</TD></TR></TBODY></TABLE>
The trunk lid closes. Sequence complete.

<A href="#ss3-2234169">Sequence for Closing the Folding Top

Before any movement of the folding top toward the closed position is allowed, the following conditions must be met or top operation will be inhibited:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The cargo cover must be pulled or extended into position (Luggage Barrier Limit Switch Closed).</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Verify that the hydraulic pump bypass valve at the motor is in the operating position by turning the valve clockwise.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The valet switch is off/inactive, it is located inside the instrument panel compartment on the left side of the compartment.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The power windows are normalized, refer to Reinitialization of the Power Windows.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The vehicle is in PARK.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The ignition is in ACCESSORY or RUN.</TD></TR></TBODY></TABLE>

To cycle the top from the open position to the closed position, press the folding top control switch in the close direction and hold. The folding top status changes to Closing and the following steps will then take place:

<LI type=1>The windows will express open (if closed).
The front tonneau (three piece closure behind the seats) opens. The header latch unlatches. This latch is located in the middle forward area of the roof panel and connects with the structure behind the seats. The trunk lid opens. Tip

If the top will not advance past Step 2, it is possible that:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Front Tonneau Position Sensor at or above the Front Tonneau Open Reference Position value (counts).</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Header Latch Limit Switches as Unlatched.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Deck Lid Ajar Status and Deck Lid Latch Switch as Deck Opened.</TD></TR></TBODY></TABLE>
<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Deck Lid Extended as Active.</TD></TR></TBODY></TABLE>

<LI type=1>The rear tonneau (the extended panel forward of the deck lid) retracts under the deck lid. Tip

If the top will not advance past Step 3, it is possible that the FTC module is not reading the Rear Tonneau Position Sensor at or above the Rear Tonneau Opened Reference Position value.

<LI type=1>The top closes (roof extends to the windshield header). Tip

If the top will not advance past Step 4, it is possible that the FTC module is not reading the Top Closed Limit Switch, inside the right hand guide pin receiver on the header, as Active/On.

<LI type=1>The front tonneau closes. The header latch latches, securing the roof panel to the windshield header. Tip

If the top operation will not advance past Step 5, it is possible that:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Front Tonneau Position Sensor at or below the Front Tonneau Closed Reference Position value.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>The FTC module is not reading the Header Latches Limit Switches as Latched.</TD></TR></TBODY></TABLE>
The trunk lid closes. Sequence complete.

<A href="#ss4-2234169">Folding Top Parameter Reference Tables

The tables below show the change in sensor inputs to the FTC module as viewed on the Tech 2® as the roof progresses through the close and open sequence.

<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom colSpan=8 align=middle>Roof Closed to Open Position Inputs as Viewed on Tech 2

</TH></TR><TR><TD vAlign=center align=middle>Parameters

</TD><TD vAlign=center align=middle>Top Fully Closed

</TD><TD vAlign=center align=middle>Front Tonneau Open

</TD><TD vAlign=center align=middle>Trunk Open

</TD><TD vAlign=center align=middle>Top Goes Into Trunk

</TD><TD vAlign=center align=middle>Rear Tonneau Closes

</TD><TD vAlign=center align=middle>Front Tonneau Closes

</TD><TD vAlign=center align=middle>Trunk Closed

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Top Control Switch

</TD><TD vAlign=center align=middle>Idle

</TD><TD vAlign=center align=middle>Top Open

</TD></TR><TR><TD vAlign=center align=middle>Luggage Barrier Limit Switch

</TD><TD vAlign=center align=middle>Closed

</TD></TR><TR><TD vAlign=center align=middle>Header Latch Limit Switches

</TD><TD vAlign=center align=middle>Latched

</TD><TD vAlign=center align=middle>Mid

</TD><TD vAlign=center align=middle>Unlatch

</TD><TD vAlign=center align=middle>Unlatched

</TD><TD vAlign=center align=middle>Latched

</TD></TR><TR><TD vAlign=center align=middle>Top Closed Limit Switch

</TD><TD vAlign=center align=middle>On

</TD><TD vAlign=center align=middle>Off

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Extended

</TD><TD vAlign=center align=middle>Inactive

</TD><TD vAlign=center align=middle>Active

</TD><TD vAlign=center align=middle>Inactive

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Ajar Status

</TD><TD vAlign=center align=middle>Deck Closed

</TD><TD vAlign=center align=middle>Deck Ajar

</TD><TD vAlign=center align=middle>Deck Closed

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Latch Switch

</TD><TD vAlign=center align=middle>Deck Closed

</TD><TD vAlign=center align=middle>Deck Open

</TD><TD vAlign=center align=middle>Deck Closed

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Status

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD><TD vAlign=center align=middle>Tonneau Open

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Position Sensor

</TD><TD vAlign=center align=middle>96 Counts

</TD><TD vAlign=center align=middle>158 Counts

</TD><TD vAlign=center align=middle>96 Counts

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Open Reference Position

</TD><TD vAlign=center align=middle>153 Counts

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Closed Reference Position

</TD><TD vAlign=center align=middle>101 Counts

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Status

</TD><TD vAlign=center align=middle>Tonneau Open

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Position Sensor

</TD><TD vAlign=center align=middle>191 Counts

</TD><TD vAlign=center align=middle>109 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Open Reference Position

</TD><TD vAlign=center align=middle>188 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Closed Reference Position

</TD><TD vAlign=center align=middle>112 Counts

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Status

</TD><TD vAlign=center align=middle>Extended

</TD><TD vAlign=center align=middle>Retracted

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Position Sensor

</TD><TD vAlign=center align=middle>209 Counts

</TD><TD vAlign=center align=middle>42 Counts

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Open Reference Position

</TD><TD vAlign=center align=middle>45 Counts

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Closed Reference Position

</TD><TD vAlign=center align=middle>206 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Compartment Lid Pull Down Switch

</TD><TD vAlign=center align=middle>Inactive

</TD></TR></TBODY></TABLE>
<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom colSpan=8 align=middle>Roof Open To Closed Position Inputs As Viewed On Tech 2

</TH></TR><TR><TD vAlign=center align=middle>Parameters

</TD><TD vAlign=center align=middle>Top Fully Open

</TD><TD vAlign=center align=middle>Front Tonneau Opens

</TD><TD vAlign=center align=middle>Trunk Opens

</TD><TD vAlign=center align=middle>Rear Tonneau Opens

</TD><TD vAlign=center align=middle>Top Closes

</TD><TD vAlign=center align=middle>Front Tonneau Closes

</TD><TD vAlign=center align=middle>Trunk Closes

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Top Control Switch

</TD><TD vAlign=center align=middle>Idle

</TD><TD vAlign=center align=middle>Top Closed

</TD></TR><TR><TD vAlign=center align=middle>Luggage Barrier Limit Switch

</TD><TD vAlign=center align=middle>Closed

</TD></TR><TR><TD vAlign=center align=middle>Header Latch Limit Switches

</TD><TD vAlign=center align=middle>Latched

</TD><TD vAlign=center align=middle>Mid

</TD><TD vAlign=center align=middle>Unlatched

</TD><TD vAlign=center align=middle>Mid

</TD><TD vAlign=center align=middle>Latched

</TD></TR><TR><TD vAlign=center align=middle>Top Closed Limit Switch

</TD><TD vAlign=center align=middle>Off

</TD><TD vAlign=center align=middle>On

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Extended

</TD><TD vAlign=center align=middle>Inactive

</TD><TD vAlign=center align=middle>Active

</TD><TD vAlign=center align=middle>Inactive

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Ajar Status

</TD><TD vAlign=center align=middle>Deck Closed

</TD><TD vAlign=center align=middle>Deck Ajar

</TD><TD vAlign=center align=middle>Deck Closed

</TD></TR><TR><TD vAlign=center align=middle>Deck Lid Latch Switch

</TD><TD vAlign=center align=middle>Deck Closed

</TD><TD vAlign=center align=middle>Deck Open

</TD><TD vAlign=center align=middle>Deck Closed

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Status

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD><TD vAlign=center align=middle>Tonneau Open

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Position Sensor

</TD><TD vAlign=center align=middle>96 Counts

</TD><TD vAlign=center align=middle>158 Counts

</TD><TD vAlign=center align=middle>96 Counts

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Open Reference Position

</TD><TD vAlign=center align=middle>153 Counts

</TD></TR><TR><TD vAlign=center align=middle>Front Tonneau Closed Reference Position

</TD><TD vAlign=center align=middle>101 Counts

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Status

</TD><TD vAlign=center align=middle>Tonneau Closed

</TD><TD vAlign=center align=middle>Tonneau Open

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Position Sensor

</TD><TD vAlign=center align=middle>108 Counts

</TD><TD vAlign=center align=middle>191 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Open Reference Position

</TD><TD vAlign=center align=middle>188 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Tonneau Closed Reference Position

</TD><TD vAlign=center align=middle>112 Counts

</TD></TR><TR><TD vAlign=center colSpan=8 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Status

</TD><TD vAlign=center align=middle>Retracted

</TD><TD vAlign=center align=middle>Extended

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Position Sensor

</TD><TD vAlign=center align=middle>41 Counts

</TD><TD vAlign=center align=middle>209 Counts

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Open Reference Position

</TD><TD vAlign=center align=middle>45 Counts

</TD></TR><TR><TD vAlign=center align=middle>Folding Top Closed Reference Position

</TD><TD vAlign=center align=middle>206 Counts

</TD></TR><TR><TD vAlign=center align=middle>Rear Compartment Lid Pull Down Switch

</TD><TD vAlign=center align=middle>Inactive

</TD></TR></TBODY></TABLE>Diagnostic Information For Intermittent Top Operation, Deck Lid Will Not Operate, Or Intermittent "Top Not Secure" Message On The DIC

<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom align=middle>Do This

</TH><TH vAlign=bottom align=middle>Don't Do This

</TH></TR><TR><TD vAlign=center align=middle>Verify potentiometer readings and install new folding top control module calibration.

</TD><TD vAlign=center align=middle>Do not replace folding top control module.

</TD></TR></TBODY></TABLE>Important: Folding top operation that is free from intermittent failures to complete open or closing operations is dependent on consistent readings by the FTC module of the position sensors in the top assembly. A customer concern of incomplete top operations, when the pump continues to run with the control switch held down, may be due to inconsistent sensor readings. For example, during an open top operation, starting from the fully closed position, the front tonneau opens, the header latch unlatches, the trunk lid opens, the top retracts into the trunk and the rear tonneau extends. The next step of the sequence is the front tonneau closing and the header latch latching. If the front tonneau does not close and the pump continues to run with the control switch depressed in the open top direction, the system has failed to recognize the completion of the last step, which was the rear tonneau extending. If the rear tonneau has physically extended and the over-center links have locked in, then the probable cause of the failure is the rear tonneau position sensor reading incorrectly. In these cases DTCs are not set because the sensor is still reading inside a valid range. In this example the rear tonneau position sensor will be reporting MID to the Tech 2. If a customer concern is not repeatable by the technician then the following procedure can be used to diagnose a concern with the top position sensors.

Important: Performing a relearn procedure on the FTC module will reset all of the reference parameters and the top will usually function again but the root cause of the concern will not have been fixed.
Important: Cycling the top system repeatedly will cause the pump motor temperature to rise. If the pump gets too hot the system will suspend operation, send a "TOP MOTOR OVER TEMP" message to the DIC, and possibly set a DTC. The system can usually be cycled three complete opening and closings consecutively without overheating the pump motor. Allow at least 10 minutes after a "TOP MOTOR OVER TEMP" is observed before operating the top again.
The Tech 2 displays four parameters for each panel that uses a potentiometer to establish its position. Here is a definition of each:

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Status: This describes the FTC module's interpretation of the panel position based on the position feedback from the potentiometer. The value from the potentiometer must be outside of the learned reference counts for the status to read open/closed or extended/retracted. When the value falls between the reference counts, the status will read Mid.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Position: This is the live feedback value from the potentiometer for the panel position. The FTC module converts the potentiometer's signal voltage to counts.</TD></TR></TBODY></TABLE>

<TABLE border=0><TBODY><TR><TD vAlign=top>• </TD><TD vAlign=top>Open and Closed Reference: This is a calibrated value that the FTC module establishes after every successful cycle of the top. The FTC module will update this value when the position value goes above or below the last established reference.</TD></TR></TBODY></TABLE>

Table 1 - Example of the Relationship Between Position Counts and Reference Counts

</TH><TH vAlign=bottom align=middle>Closed Position

</TH><TH vAlign=bottom align=middle>Closed Reference

</TH><TH vAlign=bottom align=middle>Mid Position

</TH><TH vAlign=bottom align=middle>Open Reference

</TH><TH vAlign=bottom align=middle>Open Position

</TH><TH vAlign=bottom align=middle>

</TH></TR><TR><TD vAlign=center colSpan=7 align=middle>

</TD></TR><TR><TD vAlign=center colSpan=3 align=middle>Closing direction-Counts and voltage decrease

</TD><TD vAlign=center align=middle>

</TD><TD vAlign=center colSpan=3 align=middle>Opening direction-Counts and voltage increase

</TD></TR><TR><TD vAlign=center colSpan=7 align=middle>Sample of counts for the Rear Tonneau Position Sensor

</TD></TR><TR><TD vAlign=center align=middle>0 counts

</TD><TD vAlign=center align=middle>99 counts

</TD><TD vAlign=center align=middle>104 counts

</TD><TD vAlign=center align=middle>

</TD><TD vAlign=center align=middle>190 counts

</TD><TD vAlign=center align=middle>195 counts

</TD><TD vAlign=center align=middle>250 counts

</TD></TR><TR><TD vAlign=center align=middle>0 volt

</TD><TD vAlign=center align=middle>0.74 volt

</TD><TD vAlign=center align=middle>0.80 volt

</TD><TD vAlign=center align=middle>

</TD><TD vAlign=center align=middle>3.86 volts

</TD><TD vAlign=center align=middle>3.92 volts

</TD><TD vAlign=center align=middle>5 volts

</TD></TR><TR><TD vAlign=center colSpan=7 align=middle>Approximate voltage at given counts

</TD></TR></TBODY></TABLE>Table 1 above shows the relationship of the position counts to the reference counts. As the rear tonneau is opening, the position counts are rising. As the rear tonneau is closing the position counts are lowering.
For the rear tonneau position to be considered open the position counts have to be equal to or higher than the open reference count. For the rear tonneau position to be considered closed the position counts have to be equal to or lower than the closed reference count. The front tonneau and top position sensor work the same way.

When the folding top position sensor is reading retracted it is at the low end of the scale and extended is the high end.

<LI type=1>Check the system for DTCs. If any DTCs are stored, correct them first before performing the following procedure. Note that a B3670 (Top Motor Temp Circuit) can be set as a result of repeatedly cycling the top. If this code is stored, clear it and proceed. <LI type=1>If the top will not operate, check the DIC for messages while holding the top control switch down. The ignition must be in ACCESSORY or RUN, and power windows normalized.
Use the Tech 2 to view the FTC module inputs. Capture the following panel REFERENCE counts as indicated. The Tech 2 displays four parameters for each panel that uses a potentiometer to establish it's position. Refer to the definition list above for an explanation of these terms. Use Table 3 below to capture the front tonneau, rear tonneau and folding top open and closed reference counts. The starting values can be captured before the roof is cycled. Cycle the roof either from the closed to open or open to closed position, stopping once the trunk lid has closed to capture the data. Start the engine before beginning to keep the system voltage stable.

Also observe the front tonneau, rear tonneau, and folding top position counts after each half cycle. If while the top is at rest, any of the position counts change by more than one count it is likely that a concern exists with the potentiometer installation. Readings that change more than one count at rest usually indicate excessive end load on the potentiometer shaft. Remove the potentiometer, and with a small sharp pick, attempt to clean out any foreign material or excess paint from the "D" shaped hole in the receiver and then reinstall it. The relearn procedure may be necessary if the top will not complete a cycle after the potentiometer is reinstalled. Remember to have the top in the fully open or fully closed position before running the relearn procedure. Rerun the reference count recording procedure as described above and once again observe the position counts while the top is at rest.

Important: If a panel will not reach a given state (stays in Mid) and the top stops moving, that panel's position sensor is likely at fault.

<LI type=1>Review the REFERENCE counts you captured in table 3 below. Any position sensor that exhibits a variation of three reference counts or more from the start to the final cycle may require replacement. In the table 2 example the rear tonneau closed reference has a change of three counts from the second to third cycle. If the potentiometer readings indicate a variation of three or more reference counts then refer to the "Potentiometer Replace Note" below. <LI type=1>If a new potentiometer was installed then perform the top relearn procedure. After the system is relearned perform step 6. If no sensor was replaced continue to Step 6. <LI type=1>All Model Year vehicles including 2008 that were built prior to October 4, 2007. Reprogram the power folding top module with an updated software calibration. This new service calibration is available on TIS2WEB using the Service Programming System (SPS). As always, make sure your Tech 2® is updated with the latest software version. Important: Cycle the folding top system and verify normal operation.
If the folding top operates normally return the vehicle to the customer. If the folding top does not operate properly return to Step 1. The repeatability of the readings from the potentiometers should be examined very carefully.

Table 2 - Example of Actual Position Reference Counts Taken From A Vehicle

</TH><TH vAlign=bottom colSpan=2 align=middle>Front Tonneau Reference

</TH><TH vAlign=bottom colSpan=2 align=middle>Rear Tonneau Reference

</TH><TH vAlign=bottom colSpan=2 align=middle>Folding Top Reference

</TH></TR><TR><TH colSpan=7 align=middle>

</TH></TR><TR><TD vAlign=center align=middle>Status

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD></TR><TR><TD vAlign=center colSpan=7 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Start

</TD><TD vAlign=center align=middle>158

</TD><TD vAlign=center align=middle>96

</TD><TD vAlign=center align=middle>191

</TD><TD vAlign=center align=middle>108

</TD><TD vAlign=center align=middle>208

</TD><TD vAlign=center align=middle>41

</TD></TR><TR><TD vAlign=center align=middle>Cycle 1

</TD><TD vAlign=center align=middle>158

</TD><TD vAlign=center align=middle>96

</TD><TD vAlign=center align=middle>191

</TD><TD vAlign=center align=middle>108

</TD><TD vAlign=center align=middle>208

</TD><TD vAlign=center align=middle>41

</TD></TR><TR><TD vAlign=center align=middle>Cycle 2

</TD><TD vAlign=center align=middle>157

</TD><TD vAlign=center align=middle>96

</TD><TD vAlign=center align=middle>190

</TD><TD vAlign=center align=middle>108

</TD><TD vAlign=center align=middle>208

</TD><TD vAlign=center align=middle>41

</TD></TR><TR><TD vAlign=center align=middle>Cycle 3

</TD><TD vAlign=center align=middle>158

</TD><TD vAlign=center align=middle>94

</TD><TD vAlign=center align=middle>190

</TD><TD vAlign=center align=middle>105

</TD><TD vAlign=center align=middle>207

</TD><TD vAlign=center align=middle>41

</TD></TR><TR><TD vAlign=center align=middle>Cycle 4

</TD><TD vAlign=center align=middle>158

</TD><TD vAlign=center align=middle>94

</TD><TD vAlign=center align=middle>190

</TD><TD vAlign=center align=middle>105

</TD><TD vAlign=center align=middle>207

</TD><TD vAlign=center align=middle>41

</TD></TR><TR><TD vAlign=center align=middle>Variation

</TD><TD vAlign=center align=middle>1

</TD><TD vAlign=center align=middle>2

</TD><TD vAlign=center align=middle>1

</TD><TD vAlign=center align=middle>3

</TD><TD vAlign=center align=middle>1

</TD><TD vAlign=center align=middle>0

</TD></TR></TBODY></TABLE>

<A href="#tab8-2234169">Table 3 - Blank Position Reference Table For Technician's Use

</TH><TH vAlign=bottom colSpan=2 align=middle>Front Tonneau Reference

</TH><TH vAlign=bottom colSpan=2 align=middle>Rear Tonneau Reference

</TH><TH vAlign=bottom colSpan=2 align=middle>Folding Top Reference

</TH></TR><TR><TD vAlign=center colSpan=7 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Status

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD><TD vAlign=center align=middle>Open

</TD><TD vAlign=center align=middle>Closed

</TD></TR><TR><TD vAlign=center colSpan=7 align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Start

</TD><TD vAlign=center align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Cycle 1

</TD><TD vAlign=center align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Cycle 2

</TD><TD vAlign=center align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Cycle 3

</TD><TD vAlign=center align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Cycle 4

</TD><TD vAlign=center align=middle>

</TD></TR><TR><TD vAlign=center align=middle>Variation

</TD><TD vAlign=center align=middle>

</TD></TR></TBODY></TABLE><A href="#ss9-2234169">Potentiometer Replacement Information

Inspect the potentiometer attachment screw to be sure it is tight. A loose potentiometer will exhibit poor repeatability. Also inspect the involved linkage for binding or interference. The rear tonneau potentiometer's harness routing is critical. Refer to the graphics below for the correct routing. If an issue is identified within these areas, correct it first and then fill out Table 3 again to check the variation in the open and closed reference counts.

After the inspection above, the most common reason for a potentiometer to not have repeatable readings is poor fit (clearance) between the potentiometer's white D shaped shaft and the D shaped hole in the linkage it interfaces with. It is an interference fit by design so no play exists between the shaft and the linkage. For this reason it is important to be sure that the hole has no obstructions, such as residual epoxy from a previous repair. Carefully inspect the D hole to be sure the new potentiometer will completely engage the hole. If there is any epoxy present, pick it out with a thin sharp instrument, being careful not to enlarge the hole.
Important: Be sure to install the new potentiometer and wiring harness exactly as originally installed. Misrouting the wiring harness may lead to a wire pinch and/or possible linkage binding. Refer to the illustrations below for the correct wire harness routing. Repeat the folding top diagnostic test after all repairs are done to verify system integrity.
<A href="#oth10-2234169">Correct Potentiometer Harness Routing

The illustration above shows the CORRECT routing of the rear tonneau position sensor located on the left hand trunk linkage. The protective sleeve (2) on the potentiometer wiring harness is routed underneath the wiring harness to the potentiometer connector. If the sensor currently on the vehicle is not installed exactly as shown in the illustration above, reinstall it as shown and described.
<A href="#oth11-2234169">Incorrect Potentiometer Harness Routing

The illustration above shows an INCORRECT rear tonneau potentiometer wiring harness routing. The protective sleeve (1) is routed above the wiring harness to the potentiometer connector.
<A href="#oth12-2234169">Potentiometer Wiring Harness Loop

The illustration above shows a short loop of the vehicle's wiring harness to the potentiometer connector on the outboard side of the folding top linkage. This short exposed loop of harness is as designed and should not be tie strapped down or tucked into place.
Warranty Information

For vehicles repaired under warranty, use:

<TABLE border=1 width="95%"><TBODY><TR><TH vAlign=bottom align=middle>Labor Operation

</TH><TH vAlign=bottom align=middle>Description

</TH><TH vAlign=bottom align=middle>Labor Time

</TH></TR><TR><TD vAlign=center align=middle>B9762*

</TD><TD vAlign=center align=middle>Folding Top Module - Reprogram

</TD><TD vAlign=center align=middle>0.4 hr

</TD></TR><TR><TD vAlign=center align=middle>Add

</TD><TD vAlign=center align=middle>Diagnostic Time

</TD><TD vAlign=center align=middle>0.0-0.3 hr

</TD></TR><TR><TD vAlign=center colSpan=3>*This is a unique labor operation number for bulletin use only. It will not be published in the Labor Time Guide.

</TD></TR></TBODY></TABLE><TABLE width="95%"><TBODY><TR><TD width="80%" align=left></TD><TD width=42 align=middle>

</TD><TD width=167 align=middle>

</TD></TR></TBODY></TABLE>

</FORM>

rwd · Jul 26, 2010

Thanks so much for the information and, particularly, the TSB! It's extremely helpful.

onalaska · Jul 27, 2010

Thanks for the TSB Bruce. I took my XLR into the dealer yesterday to get the roof fixed. It's got 49,400 miles so this will be the last factory warranty repair for the top. It is a CPO car, but reading the fine print they will only replace the electronics in the roof under CPO. Hydraulics do not appear to be covered@!

harrower · Jul 27, 2010

onalaska said:
Thanks for the TSB Bruce. I took my XLR into the dealer yesterday to get the roof fixed. It's got 49,400 miles so this will be the last factory warranty repair for the top. It is a CPO car, but reading the fine print they will only replace the electronics in the roof. Hydralics do not appear to be covered@!

CPO covered pump on mine.

Dave

onalaska · Aug 2, 2010

Got my XLR back from the dealer today. They replaced a kinked hose No. 35. Rerouted and secured hoses and relearned top settings. I don't see how the hoses could cause the top to just stop in the middle of opening unless they broke or were completely crimped off, but that is what it was doing. After reading the TSB I hope there is not a sensor going out and the relearn process dosen't just delay another failure. Will give it plenty of exercise to make sure it is fixed. He said they had several in with the same problem and had to replace and reroute the hoses.

rwd · Aug 4, 2010

onalaska said:
Got my XLR back from the dealer today. They replaced a kinked hose No. 35. Rerouted and secured hoses and relearned top settings. I don't see how the hoses could cause the top to just stop in the middle of opening unless they broke or were completely crimped off, but that is what it was doing. After reading the TSB I hope there is not a sensor going out and the relearn process dosen't just delay another failure. Will give it plenty of exercise to make sure it is fixed. He said they had several in with the same problem and had to replace and reroute the hoses.

In researching the problem, I've read of a number of similar instances recently that involve one specific hose. I don't know what number it is, but it runs in the area above the passenger side rear quarter glass, iirc.

In my case, the hose failed (I don't know if it was a result of being kinked) and the fluid leaked out. I'm still waiting for parts and fluid. Until they are installed and the top is operated, it's not possible to determine whether the pump was damaged or other components were involved.

While it may well be indicated, I haven't seen anything about rerouting any of the hoses. There are advisories on rerouting some portions of the sensor harness, and it's certainly worth mentioning.

Good luck, and I hope they got it all the first try.

rwd · Aug 16, 2010

DTC's 1297 and 1310

Cadillac Tech said:
Correct Potentiometer Harness Routing

[No illustration seen]

The illustration above shows the CORRECT routing of the rear tonneau position sensor located on the left hand trunk linkage. The protective sleeve (2) on the potentiometer wiring harness is routed underneath the wiring harness to the potentiometer connector. If the sensor currently on the vehicle is not installed exactly as shown in the illustration above, reinstall it as shown and described.

Incorrect Potentiometer Harness Routing

[No illustration seen]

The illustration above shows an INCORRECT rear tonneau potentiometer wiring harness routing. The protective sleeve (1) is routed above the wiring harness to the potentiometer connector.
Potentiometer Wiring Harness Loop

[No illustration seen]

The illustration above shows a short loop of the vehicle's wiring harness to the potentiometer connector on the outboard side of the folding top linkage. This short exposed loop of harness is as designed and should not be tie strapped down or tucked into place.

<iframe style="border: 2px inset; width: 540px; height: 250px;" tabindex="1" id="vB_Editor_001_iframe"></iframe>

Bruce, might DTC's 1297 and 1310 [no other codes thrown] be consistent with the harness routing problems referred to above, or might they perhaps suggest a valve issue is involved?

Top stops in mid-cycle while being raised

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