Trying to diagnose a weird window switch issue.



1985 300SD California edition.


My passenger rear window will not go down when using the switch at the door.



From the front switch, I can control both up and down just fine.



From the rear switch (on the door) I can control up just fine.



The motor is obvious working as I do have both up and down from the front. But also from an external battery using leads.



I have 3 different switches all of which have the same response; up but no down.


I've done the continuity tests on the switches based on the service manual and it appear the switches are functioning correctly.



I believe it is something to do with the connector but the only thing I can think of there is a bad connection. I've adjust the female bullet connectors within the connector to no avail.



Additional details: driver side works perfectly. Child switch is working and is/was set to allow movement during tests.



Thoughts? Thanks, Spencer