Hi

Does anybody know what the voltage is that is applied to the wing mirrors to activate the Electro Chromatic dimming function?

Mine don't change color anymore, so what to check if any voltage arrives at the mirror's dimming terminals

KR
Rob 2012 RR Vogue 4.4 TDV8 Sumatra Black
2004 Defender 110 Td5 Epsom Green, 'Alive' Chip tuned and a Warn 8274 Winch
1978 Citroen Mehari Orange Kirghise
2001 Defender 90 Td5 Softop (gone)
1992 RR Classic 300TDi 'Soft dash' Green (gone)
1989 RR Classic V8 Caspian Blue (gone)

It's usually around 2VDC but importantly it's current limited to 60mA - so don't go powering them up at 12V with a 5A fuse to protect them....
They're controlled by the rear view mirror, no local ground.

i bet oxyded connector inside mirror or door

Hi guys

A brief update.

To mimic night time conditions, I covered the light sensor at the backside of the rear view mirror (square opening in the back right hand side of the mirror) with a piece of duct tape. This immediatly triggered the dimming of the interior rear view mirror. But the LH and RH wing mirrors stayed clear.

After removing the black rectangular connector of the LH mirror, the RH mirror all of a sudden started to dim as it should. I measured the voltage which was about 1.33 Volts. I cleaned the connector of the LH mirror - reconnected it and both wing mirrors were dimming again!

I did some testing and while the LH mirror was disconnected, the RH mirror stopped dimming at a certain moment. Reconnecting the LH mirror started the dimming of both mirrors again. So there seems to be some dependency. To be sure I also cleaned the RH mirror's electro chromatic connector.

For now I all works again. Thanks for your advise!

KR
Rob 2012 RR Vogue 4.4 TDV8 Sumatra Black
2004 Defender 110 Td5 Epsom Green, 'Alive' Chip tuned and a Warn 8274 Winch
1978 Citroen Mehari Orange Kirghise
2001 Defender 90 Td5 Softop (gone)
1992 RR Classic 300TDi 'Soft dash' Green (gone)
1989 RR Classic V8 Caspian Blue (gone)