My car has a few electrical gremlins which I'm interested in hunting down and I was hoping to get some insight from those in the know. There are a few separate issues, all of which I'll mention because they may or may not be related to one another.
#1) Central Locking Inop:
I pulled the rear seat and found the pump. The PO had apparently monkeyed around with the wiring at some point because I found a new (fused) lead coming direct from the battery to the 2 prong connector on the pump, and it appears someone had added a new 3 prong connector to the existing harness using butt connectors. Connections all seem good.
The power plug for the pump has both power and ground.
When I disconnect the 3 prong connector from the pump and apply 12v power to each of the individual pins on the pump itself, the pump will power on and the door locks function as expected. Conversely, if I apply ground to the pins on the pump it will power on and the door locks all work as expected. (At the moment I can't recall whether applying power locked the doors and ground unlocked them, or vice versa, but either way all doors locked and unlocked when manually sending 12v or ground to 2 of the 3 pins on the pumps connector.)
I plugged the 3 pin connector back into the pump and unplugged the other 3 pin connector nearby. This other connector had one side with 3 colored wires, and the other end of the connector had a white wire leading under the passenger seat. Applying power or ground to the white side of this connector netted the same results as applying power/ground to the pump itself. The doors lock and unlock.
After fiddling around with all of this stuff, I just happened to manually lock the trunk with the key and was able to hear the pump kick on for a second. Unlocking/relocking the trunk (or anything else) did not net any further results.
So as far as diagnosing my central locking issue, where should I look next?
#2) Rear windows inop
Fuses are good. Pulled the front console and swapped all of the switches around. Switches are fine since they operate the front windows without issue. No noises coming from the rear doors that I can hear when operating the switches. Used a test light on the rear window connectors in the front console and found power on one pin in each connector. Pulled one of the the rear door panels and used my test light on the switch connector and could not find power on any of the pins. Inspected visible wiring in door, looks good as new. Pulled cover from pillar and inspected visible wiring, all looks intact, although I did find a disconnected power lead near the rear door switch which doesn't seem to have anything to connect it to.
Where do I look next?
#3) Rear door switches/lighting inop
Opening and closing the rear door does not toggle any of the interior lights. When the front doors are open, the lights in the rear doors do not light up, however when manually turning them on via the switch in the dash they do light up. Used test light on rear door switch connectors and found no power at any time.
#4) Rear power headrests inop
Haven't even begun to troubleshoot these, not really a huge deal, but it would be nice if they worked. Where do I even begin?
#5)OEM Becker Radio Inop
The radio powers on but no audio can be heard from speakers. Also, when using the "automatic" tuner button it never locks onto any channels. Any likely causes I should look into?
I'm not expecting miracles here, but any insight would be helpful.
