I have recently purchased a Peugeot 406 interior autodim mirror which has 3 wires, white, black and grey but before i install it and either destroy the mirror or the car would someone please advise me on which of the coloured wire are the live and earth. I am guessing that the remaining wire operates from the BSI after reverse is selected so technically i only need the live and earth.
I have looked at Sedre but as the wires arent numbered on the mirror side of the wiring and the plug has no markings to indicate pins 1, 2 or 3.

Thank you in advance to someone who may kindly help me to distingush the correct wires.
Garry