2004 Fan Schematics
Thread Starter
Safety Car
Joined: Feb 2006
Posts: 4,545
Likes: 388
From: Fort Worth Texas
Well I had the PCM redone, put it back in, same problem. They sent me another PCM, and same code, so I ruled out PCM. It is at my buddy's Corvette store, and his tech has it apart. He only has 02 shop manual that shows red and blue proms. My 04 has blue and green proms?
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Proms? What are you referring to?
Tech Contributor
Joined: Jan 2007
Posts: 19,566
Likes: 1,207
From: Dyer, IN
It doesn't matter, the pinout is the same.
C1 - blue connector - pin 42 - low speed cooling fan relay control
C2 - red or green connector - pin 33 - high speed cooling fan relay control
....I'd be concerned if the tech working on your car could not figure this out.
Thread Starter
Safety Car
Joined: Feb 2006
Posts: 4,545
Likes: 388
From: Fort Worth Texas
Thanks Lucky! This problem is going to be the death of me. I can only assume it is in the wiring from the PCM to the fuse block under the hood. It had probably 10 nicked or chaffed wires on the harness near the PCM.
Thread Starter
Safety Car
Joined: Feb 2006
Posts: 4,545
Likes: 388
From: Fort Worth Texas
Tech Contributor
Joined: Jan 2007
Posts: 19,566
Likes: 1,207
From: Dyer, IN
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