I'm trying to figure out why the power lock is not working in one of the doors of a 2004 Buick Rendezvous, unfortunately I don't really understand how the power lock system works. There are two connectors attached to the lock mechanism, one near the top and one lower down. The connector near the top has three thin wires, red, black and blue with white stripe. The lower connector has two thicker wires, olive (greenish) and tan (brownish).
When the lock/unlock buttons are pressed, I can measure continuity between the blue with white stripe wire and ground (chassis). No other wires seem to be connected to ground, or each other no matter the state of the lock/unlock switch.
I'd like to determine if the problem is with the actuator or the wiring, before I just start throwing money at the problem.
I have not been able to find any schematics online, nor was I able to locate the Haynes repair manual for this vehicle. I'm basically working in the dark on this, and would appreciate any assistance I can get.
According to the installation manual for the remote start module (installed before I owned the vehicle), lock works via a negative trigger through a 470 ohm resistor, while unlock is a negative trigger.
The lock/unlock feature of the remote start is not hooked up, so I don't suspect that could have caused the failure.