Audi A3 Window Problem

 The Audi A3 is having intermittent operation of the drivers door window.

We do not know how it works but it appears there is a control box integrated with the window winder motor.

We have now established that the connection between the switch set and the controller consist of one common wire for all switches and then one more wire per switch.  Then each switch has 4 resistors to indicate which switch is pressed.

This video says that if one does a long press on the remote control unlock button that all 4 windows should scroll down.  Did not know this when we started but this may help us diagnose.

https://www.youtube.com/watch?v=OurkA-7SdN8

Having traced the wiring we tried jumpering resistors in place of the switch block and this worked for a minute or two but then it stopped working.  So it looks like the DCM knows if you have the rest of the door has been pulled apart because when we plugged the door wiring back in, it started to work again.

https://youtu.be/uA8y5Yiy7wc

 

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We observed the connectors are press fit.

This can lead to intermittent issues so we soldered them. The down side is potentially less vibration tolerance.

Note the pin numbering is down one side and back up.  Like an IC but not like standard ribbon cable connectors