The GM wiring diagrams show no speed signal going to the BCM. So, if there is no speed signal to the BCM I have to assume one of two things.
1. Wiring schematics are incorrect.
2. Speed signal from the PCM to the BCM is sent via the class 2 serial data wire.
However, there is a speed signal wire that comes off the PCM, and it might be the wire that goes to the NAV system is equipped with the NAV unit.
It comes off pin 21 of the blue connector. Whether or not that wire is there depends. It might not be except on vehicles with the NAV unit.
I have to say again, I could swear in the older Hummers, there was a speed signal at the radio connector; regardless if it had NAV or not. I could be mistaken, but some people are getting this speed signal from someplace.
I can check on Monday, with the validation engineer and see if he has validated the H3 schematics, and see if he remembers anything in regard to the PCM to BCM wiring being fudged up.
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Black Sheep Hummer Squadron
(ME TOO)
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