To elaborate, GM is one of the top manufacturers with customer-unfriendly business practices, and this is one of the big ones. The engineers have designed their computers so you can't go to a salvage yard and pop in an inexpensive, used one. You have to buy a new one through the dealer and have them install the software. In a few cases you can use a used computer but it still has to be programmed to your vehicle's ID number. GM is one of the few manufacturers that won't allow independent repair shops to do that. Most of the time only the dealer can do that, and they don't do it for free.
To do this, the ID number resides in the Body Computer which was cleverly built into the radio so you can't easily replace it with an aftermarket one. All of the dozens of computers on your vehicle answer to and are turned on by the radio.
Tuesday, February 10th, 2015 AT 7:42 PM