Attaboy! I wish i'd had this wisdom from you 10 years ago!
Dieselvolk,
This afternoon I had some time to trouble-shoot the central locking
system on my '87 wagon. The system had not worked correctly from
purchase in 2004. Initially only the driver's door lock would
activate the system. The rear hatch lock tumbler is damaged and the
key won't turn it, and the front passenger door locked and unlocked
with the key, but would not activate the central locking system.
Most of the way through this repair, I found there is an excellent
trouble-shooting guide in the FSM. The guide would have saved me a
little time, but where's the fun in that? I enjoyed the mental
exercise of working out my own testing procedure.
I started at the driver's door, as I surmised that the problem was
broken wires in the accordion joint at the door hinge area. Took off
door panel, found the connector for the central locking system was
failing apart and one of three pins was corroded. That wire broke
off the pin when I touched it. Fixed the broken wire and corrosion,
and commenced testing wires.
Went back to the right rear seat, exposed the pressure/vacuum pump,
found water under the carpet. Darn! This is a new problem...
Tested for power and ground at the pump, it had both. Tested power
and ground (two of three wires) at the door, had ground but weak
power (about four volts). Third wire at the door connector is the
signal wire to the pump. Applying power (twelve volts) or ground to
this wire would cause the pump to operate correctly and either lock
or unlock all doors.
The power for all door lock switches and the pump comes from one pin
on connector X30. I decided to find that, do I went to the FSM, and
learned it is in the driver's foot well.
About this time I recalled reading a thread on the Peach Parts
forum, where a central locking system in another '87 wagon was fixed
by repairing a crimped wire joint under the carpet. After a bit of
searching I found the thread, and learned that both power and ground
had crimped joints under the carpet of the right rear passenger foot
well.
Exposed those crimp joints, tugged a little on the power wire crimp,
and it came right off, full of corrosion. Stripped off insulation on
each wire, twisted them all together and soldered that joint, then
covered it with liquid electrical tape.
Problem solved, central locking works from both driver and passenger door.
Now I've got to find the source of the water under the carpet...
--
Max Dillon
Charleston, SC
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