Originally Posted by
CyberCG
Well boys and girls. The offending component has been identified.
I replaced the BCM with one having the same hardware version and the same software version.
Wipers work. Console lock switch works. Turn Signals work AND the car allowed me to resync the FOB!!! Even the FOB will unlock and lock the doors!
Who knew?! The BCM has its little fingers into much more than suspected.
Now to the next. I noticed while testing the new-to-me BCM that my high beams do not work.
I'm gonna save that for another day, but am open to common causes if you know.
Thanks for your help!!
I really did not think the BCM would be it, but the BCM IS involved in:
Locking/unlocking
Turn signals
Wipers
All SKREEM to CLP/SSM functions pass thru the BCM (explains your locking issue).
Turn signal function is a BCM funcion (explains your turn signal issue)
WIpers are a BCM function (explains the wiper issue).
But after 14 years here, Iv'e never seen THIS failure mode. As our cars age, we are going to discover more and more oddball issues like this. You are to be thanked for coming back to "close the loop" so we all learn.
I drew this up some time ago, it shows how the door switches, SKREEM, FOB and CLP/SSM all work together. Note how ALL signals from FOB, door lock cylinder or console lock switch go thru the BCM:
