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The BCM uses harness ends that could match your description. The BCM is under the passenger's feet.

Though do not follow an (older) relative of mine who tried to check his sealed for life battery by taking a chisel to the top to hack it off...

"Wires" especially in the context of a mis-fire on a gas fuelled motor commonly refers to the high tension wires from the coil to the plug (via the distributor if it is old enough, coil pack if more recent). The "wiring" is typically the "harness".

Good going for a motor that has no wires. It is coil on plug.

If you have reason to suspect that a fob is keeping your XLR awake, don't forget it is being in range that counts, a door or a wall is not necessarily able to attenuate the signal enough; for example, keeping the fob on the other side of the garage wall is a known issue.

Is it possible to do this? The starter is high up in the valley. However, the alternator is low down at the front left. WARNING, the following can crush your fingers, use a tool! Once you have the deck lid open and battery power restored, you can test the latch easily, though you do need to...

If I Recall Correctly

It is a while since I did this. IIRC the top of the key turns to the left, but I'm only about 55% sure! It turns against a modest resistance, certainly not a stiff one. It is possible to break the release mechanism if you heave too hard, others have done that and then there is going to be a...

Pull the release handle on the floor, next to the door. Don't shut the door until you have the hood up and can charge the battery (or fit a new one).

I can't comment on if GM have a bad batch of thermostats, but the design which makes it most likely that when a thermostat fails, it fails open is clever. It is possible for a modern thermostat to fail closed, but that is rare. If the DIC message is present, then P0116 should set. P0116 sets...

You could get one of those little rubber sucker things and pull up gently on the roof panel.

It is also possible that you have the wrong thermostat fitted and it opens too soon. Some owners like to run their engines with a low opening temperature thermostat, I don't know if you know the full service history of your XLR. A technician should measure the temperature of the coolant when...

It might be useful to understand what is going on here. The "Engine hot" message does not mean that the engine is hot, it means that the engine might be hot. This situation arises because the engine management computer can't work out what is wrong. What it 'knows' is that the engine isn't...

Maybe this needs thinking about a different way. What is wanted is a headlight unit that: * Fits in the space * Looks about right * Meets legal obligations * Can be adjusted * Casts sufficient light where it is wanted * Has the same wiring and bolt pattern To achieve those does not require an...

Are the left/right headlight assemblies a mirror pair? Optically they might not be, given driving on the right, lighting to match?

Much the same applies if you are going to work on your XLR and need to disconnect the battery. Open a door FIRST, THEN disconnect the battery (and trunk if you need it). Ok, you can re-connect the battery and open a door, but it is easier to remember "leave door open and don't shut it while...

The right hand tank being full of gas does not mean that the venturi pump (the Siphon Jet Pump) has failed (though it might have). It means that it isn't working, which is different. If the power source for the pump has failed, then it won't pump. That power source is a supply of gas from the...

Your XLR only has one electric fuel pump, it is in the left tank. Now, if you consult the workshop manual, it will describe how to remove the fuel pump from the right hand tank, it means the passive pump in the right hand tank. If you turn to the fuel system description at around page 6-1214...

Two fuel pumps is news to me. There is a single electric one (IIRC its in the left hand tank). However, there is also a venturi system that flows fuel between the two tanks and it is possible that this system might be called a fuel pump by some. It does pump fuel, using the fuel flow from...

Are they clones? I'm no expert on this, but my understanding is that the GM official ones were made in China. The official ones also have either a GM badge, or the badge of one of the Divisions. It has been discussed that the unofficial ones do not support every function of the official ones...