Last summer I made an effort to replace the PCM on my Chrysler Cirrus. I sent my PCM to a shop that presumably would repair it. They turned out to be a sham and I thought I'd lost my PCM. So I did my best to determine the proper part number and started hunting in parts yards. I came up with what I thought was the same unit -- it had identical connectors, came from a 95 Cirrus like mine and so on.
I installed it and things were great. The car's AC worked again (hadn't worked in a year), the car didn't die at a stop, and idled great. I wrapped it up and went inside. Shortly afterwards (maybe 15 mins) my wife ran in to say the car was honking and wouldn't stop.
I had to remove battery connections to get it to stop. Odd thing on this was, I didn't think I had a car alarm.
I managed to find the jerk who had snatched my computer and his stash and got it all back. I found out that I had a PCM with a part number that differed in one digit.
I placed the old but semi-functional PCM back into the car and reconnected the battery to hear the sound of honking.
What have I done? Have I managed to cook something else? the BCM perhaps? Or is there something that I need to reset?
Any advice and pointers to repair/replace resources for the still bad PCM would be very appreciated.
Regards, G Geno