Hello All,


I have a 04 XLR that has developed an A/C problems and need help troubleshooting it.
On my 05 Deville DTS , I am able to read the car's system Diagnostic Trouble Codes [DTC] on the Driver Information Center [DIC] display to troubleshoot problems.
Is their a way to display these DTC codes on the XLR DIC?
Or will I need to go somewhere that has a Tech II reader?

Any help appreciated.

Thanks and Regards- Mike 27513

Hello All,


I have a 04 XLR that has developed an A/C problems and need help troubleshooting it.
On my 05 Deville DTS , I am able to read the car's system Diagnostic Trouble Codes [DTC] on the Driver Information Center [DIC] display to troubleshoot problems.
Is their a way to display these DTC codes on the XLR DIC?
Or will I need to go somewhere that has a Tech II reader?

Any help appreciated.

Thanks and Regards- Mike 27513
Welcome to the XLR Forum.

I think you will be needing a Tech II or other device that can at least read the codes.

It may cost a labor hour to determine what is going on ($80).

Regards

Jerry

Thanks for the information.
The Dealer checked the system and determined it was a blown A/C compressor fuse. The system checks showed the compressor , sensors, freon etc. were within spec. Are their any common XLR specific failure modes that the dealer might not be aware of?

Unfortunately within the same week this fuse has blown again.
Is this a common problem on the 04 XLR ?

I know the electrical system and wiring harness were changed in the 06 and up XLR. Was this to address this or other electrical issues?

Any Help Appreciated.

After looking at the HVAC Compressor Control circuit, I see one 10A fuse (#15) in the Underhood Bussed Electrical Center (UBEC) that powers the compressor clutch. If that's the fuse that's blowing, the compressor may be failing and intermittently drawing excessive current. Replacing the fuse will only provide temporary relief. If the dealer installs a new fuse, and it doesn't blow, the system will appear fine. Not every component that can cause a short will flag a DTC. The shop manual has specific tests (using a 10A fuse in a jumper cable) to check actuators, etc for excessive current. A shorted-out HVAC module would leave a DTC in memory, and the dealer would have most certainly caught that with a Tech 2. It could be something like a chaffed harness coming into contact with the chassis when jolted.

You can install a new fuse, run the AC at full load and time how long it takes to fail. If the compressor is occasionally binding due to worn bearings, I would expect to hear some noise, but you never know. . .

Probably a better question to initially ask is, which fuse is blowing?

This issue hasn't been noticeable as a common failure. Your dealer can browse GM's SI library to verify.

'06> models had new features, (adaptive headlamps, mirror-mounted antennas, etc) requiring a revised harness.

CC :seeya