Hi - sorry if this is hijacking this thread slightly, but I have maybe a similar problem.
My drivers door wing mirror indicator and puddle lights are not working - the mirror unit is powered and will fold in and out using the knob / switch on the drivers door, the mirror itself can be moved using the same knob / switch when set to the 'R' position but neither of the lights in the unit work. I have today replaced the light part of the unit as I thought that would solve it (£55) but still no lights. But maybe this is the cause - before I bought the car (two weeks ago) the garage had the drivers door window motor replaced as they said it was faulty. Would this require the wing mirror indicator and puddle lights to be coded onto the car again?
The wiring looked 'OK' at least those I could see when I disassembled the mirror this morning, and as I wrote above, it has power (mirror and unit will move using interior knob / switch) but no idea if wiring further within the unit is damaged.
Any suggestions as to what to try next?