'94 Q45 door lock works intermittently

[coolman]

I have a 1994 Q45 with the driver's side back seat power door lock working intermittently. I don't think the problem is with the solenoid of the door lock, but rather a relay problem.

Where would the relay for this be located?

What other problems other than the relay could have caused this?

Thanks,

[goody90q45]

Are you unable to lock unlock from the front door control switch and the rear door latch? If you've ruled out the door lock actuator then the 94-96 has a power window amplifier (LCU?) in each door and I believe it also controls the door lock function. It's the only controller mounted on the door when the door panel is removed. Can't miss it. It's a common failure item and a new LCU is $100+ through our sponsors.

[coolman]

goody90q45,
What is the part number to the LCU (drivers side rear)? Can I get it cheaper at say autozone.com (oem or other manufacturer)?