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Electrical Outside Mirrors Repaired

Electrical Outside Mirrors Repaired

Stefan Knappe

Hi all,

After the recent purchase of my '86 SIII I noticed that the horizontal movement of the right (passenger) side mirror didn't work. The vertical movement did. I suspected the joystick-type little switches to be faulty. Unscrewed them and changed the the switches from left to right miror. Same symptoms. So I knew that the switches were okay.

I unscrewed the right mirror (two Philips-headed screws, rusted, see below) and found the wires running into a rubber channel into the door. They can be pulled out (carefully, channel is narrow, sprayed some WD40 inside) and a connector appeared. This connector is held together by a plastic strip to prevent the two halves falling apart. Took off plastic strip. Contacts corroded. Cleaned male connector with emery paper and female connectors with a 1.5mm drill, turned by hand in anti-clockwise direction. Then female connectors compressed a little bit with a needle (to decrease diameter), spayed with rust inhibitor and put back together. Worked like new. Don't forget plastic securing strip on reassembly!

The mirror didn't came off because one of it's screws was rusted. The nut, which is mounted into the door, is of the 'pop-rivet' kind with a thread inside. The screw turned and turned, so did the nut. I took off the inner door panel and unscrewed the inner remote handle assembly. This gives access to the inner area of the door and you can grap the inserted nut with pliers, then undo mounting screw from outside. Easier with a second person helping, also very good idea is to mask the painted area around the mirror with some tape or so.

Electrical connections at each joy-stick switch was as follows:

1 plug with two wires red/black power feed, always hot
1 plug with four wires green/yellow/blue/white to mirror

Switch gives +-12V to green/yellow for horizontal and +-12V blue/white for vertical action.

All above applies for '86 model, dont know for earlier/later cars.

Best regards

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