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Car Forum / Chevrolet / Chevrolet Trucks / November 2004a/c stuck on - ECM?
I've got a 96 K1500 Suburban. The a/c compressor compressor (clutch) is now on always when the engine is running. The a/c switch light on the dash toggles normally, but has no effect. The compressor clutch releases just fine when the wires to it are disconnected. The a/c relay is not shorted and works fine. It seems the relay coil is always energized by the ECM. This is where I lose it. Is there some way to diagnose it through the ECM? Do I need to replace the ECM? Where is the ECM? I have a Chilton manual with wiring diagrams, but I can't see how the a/c switch on the dash feeds into the ECM. Any help is greatly appreciated. -Roy Inline................. > Is there some way to diagnose it through the ECM? No. > Do I need to replace the ECM? Probably not. > Where is the ECM? Should be on the passenger side of the engine bay, either mounted to the inner fender or behind the firewall. Try resetting everything first, by yanking the PCM fuses and leaving them out for a few minutes. It'll run like junk for the first few minutes after restart as it relearns everything, so don't freak out. Doc Wow, that worked. Thanks a 1/2 ton! -Roy > Wow, that worked. Thanks a 1/2 ton! > > -Roy You're welcome. Doc > > Wow, that worked. Thanks a 1/2 ton! > > [quoted text clipped - 3 lines] > > Doc In regard to your successful solution: "Try resetting everything first, by yanking the PCM fuses and leaving them out for a few minutes. It'll run like junk for the first few minutes after restart as it relearns everything, so don't freak out." Would disconnecting the battery have accomplished the same thing? Of course, disconnecting the battery used to cause a lot more work, like having to reset the clock and favorite ratio stations. But would the battery disconnect work? Inline.................... > Would disconnecting the battery have accomplished the same thing? Yep. > Of course, disconnecting the battery used to cause a lot more work, like > having to reset the clock and favorite ratio stations. Still does. > But would the battery disconnect work? Yes, but he'd lose his clock and radio settings, plus if he had a Theft-Lock radio and forgot to disable it before yanking the battery it would need to be unlocked by the dealer. On OBD-II vehicles, it's just easier to yank the PCM fuses. Doc > Inline.................... > But would the battery disconnect work? <<Yes, but he'd lose his clock and radio settings, plus if he had a Theft-Lock radio and forgot to disable it before yanking the battery it would need to be unlocked by the dealer.>> Thanks for the reply. Could you please describe the procedure for disabling the Theft-Lock radio? Mine is the standard Delco single-play CD model. >> Inline.................... >> But would the battery disconnect work? [quoted text clipped - 9 lines] > > Mine is the standard Delco single-play CD model. It should be in your owner's manual. >>> Inline.................... >>> But would the battery disconnect work? [quoted text clipped - 11 lines] > > It should be in your owner's manual. I hope it is because I don't have a f**king clue! Never owned one or yanked the battery cable on one that had one................................ Doc |
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