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2004 - 2009 Cadillac XLR: Service Bulletin: #PIC5558: Additional Diagnosis For Folding Top Temperature Messages Displayed On The DIC - (Oct 3, 2011)

#PIC5558: Additional Diagnosis For Folding Top Temperature Messages Displayed On The DIC - (Oct 3, 2011)

Subject Additional Diagnosis For Folding Top Temperature Messages Displayed On The DIC
Models 2004 - 2009 Cadillac XLR
2005 - 2012 Chevrolet Corvette with Power Folding Top (RPO CM7)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:

On some occasions it may be found that the folding top is inoperative.  A message on the Drivers Information Center (DIC) may read "Top Too Cold To Move" or "Top Motor Over Temp".  You may also notice a DTC B3670 that is set in the Folding Top Control Module.

Recommendation/Instructions:

If normal diagnosis leads to replacing the folding top pump assembly, disconnect the white dock-and-lock connector on the side of the pump.  Using an ohm meter, check resistance across terminals B9 and B10 (Cadillac XLR) or terminals B7 and B8 (Chevrolet Corvette) on the pump side of the harness connector C431 (X431).  Then record the resistance reading and compare to the chart below.

Celsius

Farenheit

Resistance (ohms)

-40

-32

5.32M

-30

-22

2.966M

-20

-4

1.74M

0

32

750000

20

68

263000

25

77

220000

30

86

179500

40

104

121300

50

122

83630

60

140

58710

70

158

41920

80

176

30410

85

185

26400

90

194

22390

95

203

19555

100

212

16720

110

230

12630

120

248

9663

130

266

7478

140

284

5851

150

302

4625

160

320

3691

170

338

2973

180

356

2415

190

374

1978

200

392

1632

210

410

1355

220

428

1132

230

446

952

240

464

806

250

482

686

260

500

587

270

518

506

280

536

437

290

554

380

300

572

332

If the top has only been operated one time, a message is displayed, and the thermistor is reading outside the normal range, the folding top pump will need to be replaced because the thermistor is not available separately.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

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