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I have a 1996 Monte LS with the GM3100. It's OBD-II, but has the PCM with the OS/ID ending in 1539, meaning it's the old 256k memory module type and cannot hold the required information for a DHP PT. I recently bought a '97+ DHP PCM, and have attempted an install. The wiring harnesses attached fine, but I'm about 90% positive the pin-outs are wrong.
Here's why:
As soon as I reconnected the battery, the high-speed fan turned on. I turned the key to crank the engine. It attempted, but never fired. Starter cranked nicely. Engine just said, "Nope, you lose."
At first, I thought I required a Passkey-II relearn, but the security light turns off after five seconds, instead of remaining on for the required 11 minutes to do the relearn procedure.
Now, in order to fix my pin-out problem, I need both the wiring diagrams for the '96 PCM as well as the wiring diagram for a '97+ PCM. I looked through the haynes manual, but they lumped '96 in with the '97-'99 model years, which is entirely inaccurate, because the "Blue" wiring connector is "upside down" in comparison to the '96 PCM.
Can anyone help me by supplying said wiring diagrams? Or if there's a problem I'm just not catching... what else would cause the high-speed cooling fan (the one on the driver's side.) to turn on and never disengage? Or am I just looking at having to remove and relocate pins?
Here's why:
As soon as I reconnected the battery, the high-speed fan turned on. I turned the key to crank the engine. It attempted, but never fired. Starter cranked nicely. Engine just said, "Nope, you lose."
At first, I thought I required a Passkey-II relearn, but the security light turns off after five seconds, instead of remaining on for the required 11 minutes to do the relearn procedure.
Now, in order to fix my pin-out problem, I need both the wiring diagrams for the '96 PCM as well as the wiring diagram for a '97+ PCM. I looked through the haynes manual, but they lumped '96 in with the '97-'99 model years, which is entirely inaccurate, because the "Blue" wiring connector is "upside down" in comparison to the '96 PCM.
Can anyone help me by supplying said wiring diagrams? Or if there's a problem I'm just not catching... what else would cause the high-speed cooling fan (the one on the driver's side.) to turn on and never disengage? Or am I just looking at having to remove and relocate pins?
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