I am looking to swap PCM's, and was wondering if the pin-outs are the same. I want to put a 2004 PCM, # 12586242, into a 2003 that has #09354896. I will disable VATS. The 2004 is supposed to have a faster clock and more ram, if I am reading correctly. I was wondering if the connectors are the same with the wiring all being the same at the pins.
The 04 ECU should have a green and blue connector, while the 03 should have a red and blue. There are a few wires that will need moved around. Not nearly as many as the 97/8 ECU swap but it's still not a straight plug and play swap. You'll need to swap a few wires, and then you'll need the green connector "adapters".
The biggest problem will be if you're using the 04 ECU in a GM vehicle with a BCM or any other type of security feature. Even if you disable the VATS, depending on the vehicle, it may not like a different VIN number in the PCM, and with HPtuners you cannot have a VIN/OS mismatch.
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Thanks for that info. I am looking at this 04 ECU going into a 98 Corvette (blown) that has already had pin changes for the 03 ECU. The reason for the 04 swap is that the 03 has everything working but the cruise control, and the head mechanic thinks there is something wrong in the 03 ECU.
What do you mean by 'adapters' for the connector?
The colored portion of the connector. It contains the mechanical "key" that won't let you plug into the wrong PCM.
It pops off easily, just remove and replace.
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