1999 Firebird V6
no key fob to check
When pressing the lock/unlock switch on the door I hear an audible click in the BCM.
When actuator is disconnected the wires Gray and Tan are shorted to each other.
Disconnect the BCM and the Gray and Tan wires lose the short and have perfect ohms from BCM to door actuator.
Power windows work fine.
Radio works fine.
Trunk release works fine
All fuses are good.
Checked the 5 soldering points on the BCM, they look pristine.

Is the BCM bad? Should I do what post #95 in this thread did?
https://camaroforums.com/forum/93-02...ispreloading=1

The actuator has 2 plugs. Should the Gray and Tan have 12VDC? or is it a constant voltage from the other Black and Gray/blk and the BCM sends a signal to lock unlock?

 

The gray and tan wires should operate the lock solenoid and the black and gray/black wires are for a door open input to the BCM. Here's a couple of schematics that may help explain how the circuit is wired.

 

that would explain why it is shorted on c1 a to b. Always set to ground.​​​​​​​ill ohm some more tomorrow and see. Thanks for the schematic

 

Yes, but I wouldn't use the term "shorted" because to me, that infers there is a problem with the circuit being damaged and grounded because of this damage. The internal BCM Door Lock Actuator relays are always hot and if the BCM circuit board doesn't provide a ground to the relays to energize them or the relay coils themselves are damaged, the actuators in the doors won't operate. The door lock switches provide the BCM with a ground input, so check them for the correct operation to rule them out. The schematic below shows the door lock switches wiring.

 

Thanks again, I'll do some more troubleshooting this weekend. I have new switches coming but do not want to buy a BCM.

My terminology is from my old aircraft avionics days but understandable shorted indicates a problem. Should have said "has continuity"

 

Someone correct me if I'm wrong but I don't believe you can buy new ones,obsolete part.
There are services to restore them on ebay.

 

Correct for the BCM. Its a rebuilt one. If that is my issue i may try to swap the relays myself

The switches i got on amazon

 

I was pretty sure that was what you meant but was afraid others may not know you were referring to checking for continuity.
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