Driving home one night from work and instruments went dead along with dash lights, interior lights, A/C switch, turn signals, hazards, and can't remember what else. It was strange because the car continued to run and start just fine until I got the problem fixed. I checked all the fuses and relays and checked for loose wires and grounds. Seen something online about possible computer problems. Went to a salvage that a friend of mine ran and he let me do what I needed. I got several BCM's and PCM's to try.

(BCM = Body Control Module) (PCM = Powertrain Control Module)

Do NOT try to swap any of the computers with salvaged components as I tried this. I even match all the numbers on the tags thinking that would help, WRONG!!! My car would not start AT ALL after hooking up these other computers. This is what I learned after buying salvaged parts that don't work...........The computers are programmed for each specific car and will only work in the car they are programmed for. ( with the exception of a few lucky ones).

I managed to to find out, somehow, that the computers lose their mind over a period of time much like people, some quicker than others. My BCM flaked out early in life. I did some digging and found that you can take your car to your GM dealer service dept. and they can "Flash" the memory for $75.00. This is important to know because they have to login to the GM database and download the original program that was specific for you car when it was built by using the VIN.

Mine has worked great, no problems since then.

I hope this helps some of you. Good luck.