Window rolled down 2 inches, and that was it.. finished the trip with a lot of wind noise. It had been getting intermittent before but now, nothing from either the central switch or door switch. No motor noise, nothing.

Research here suggested frayed wires at B pillar. So I stripped the pillar and door card off, only to find wires in perfect shape everywhere.

So I disassembled the door window switch and cleaned all its little internal parts and external contacts properly with light sanding of charred carbon (arc) residue, tarnish on silver parts, etc.. sprayed with contact cleaner w/PPT additive, and put it all back together and ... fixed!




I should have done this first. Because a few weeks ago, I had finally lost some directional controls of power driver seat, restored by overhauling the internals of the power seat switch similarly ... and restored all function of power seat.


It is a whole lot easier to pop the switch out and try this first, before taking pillar trim and door card off... just a tip.

How many cars list a routine maintenance item "clean the insides of switches" every 30 years ?!?
The fact that you CAN take switches apart and service the insides.. is unheard of nowadays.

__________________
Cheers!
Scott McPhee

1987 300D