[pete-p]

So I've been studying the wiring diagram for the interior lights and think I have the solution.

The usual plug on the mirror with/without dimming has the pins below:

1. Red - Always live even when ignition off.

2. Grey/Green - Switched live with headlights. Also same colour wire provides power to other lights (e.g. ashtray)

3. Green - Unsure. Some reversible ground from lights? Goran indicates this as being activated by driver's reading light switch but then connected it to the negative for the Dashcam.

4. Grey - Not sure but possibly related to headlights or perhaps the other reading light, only other grey I can see is between the headlight switch and the relay in the footwell.

5. Blue - Ground. Another blue on the tiptronic switch is connected to ground (brown) so seems logical this does too.


So I found a 9v battery and connected the positive to pin 2 and negative to pin 5 and the red ambient lights switched on. I think this is where I need to connect pins 2 and 1 from the dimming circuit.

Not sure if I can connect pin 3 from the mirror (linked to reading light switching) to pin 6 of the dimming (normally connected to interior front and reading lights) any thoughts?!