Door mirror indicators not working.

[renault12ts]

Both of the door mirror indicators in my w215 do not work.

Everything else works on both sides and I have discounted broken wires both in the mirror housings and to the door control modules.

The leds themselves work because I have tested them with a battery.

I don't think they need to be coded...what's up?

 

[MancMike]

If you've tested the LEDs with a battery, have you done the opposite and tested at the LEDs for voltage with a meter with the hazards flashing?

 

[AMGeed]

Is there a fuse for the door mirror indicators?
You seem to ruled everything else out.
They are plug and play when replaced.

 

[renault12ts]

If you've tested the LEDs with a battery, have you done the opposite and tested at the LEDs for voltage with a meter with the hazards flashing?

Yep I get a reading on the multimeter at the socket where the led connects....but hard to say what it is because it goes on and off.

 

[renault12ts]

Is there a fuse for the door mirror indicators?
You seem to ruled everything else out.
They are plug and play when replaced.

I didn't think there would be a separate fuse for just the indicators in the mirrors and nothing else...therefore I haven't looked for one. The puddle lights use the same connector...they work.

 

[GordonTarling]

Have you just fitted the LED's? If you have, then their polarity is probably wrong, so try swapping the two wires over.

 

[renault12ts]

Have you just fitted the LED's? If you have, then their polarity is probably wrong, so try swapping the two wires over.

No, they are standard.

 

[whitenemesis]

So, there's power at the socket and the LEDs work with a battery connected. So what's between those two test points?

 

[bob6600]

So bad contact at the pins? But both sides?

 

[markjay]

On a general note... when both sides fail (of any feature) one likely culprit will be a module somewhere - front SAM, rear SAM, etc.

In the olden days it was always a relay somewhere... but I think that modern cars don't have that many relays anymore.

 

[design guru]

When the door control module on my W220 S320cdi went the indicator on the mirror would not work, I ended up buying a second hand module which is located in the electric seat switch and then it started again.

 

[renault12ts]

SOLVED.

Thanks for all your help and to Gordon Tarling who mentioned polarity...you were correct.

I got the left side working by a bit of wiggling. But the right side was defeating me.

The right side mirror mechanism and wiring loom had been replaced earlier this year when I decided to mangle the old one. It was not oem.

By use of my trusty multimeter I discovered that during manufacture at the end which plugs into the door control module someone was having a bad day and had put the two pins for the indicator in the wrong way round. So...I swapped them around and hey presto.