W208 CLK Wing mirror indicator not working.

[TomsAmg]

Hi people,
As above really, previous owner said the drivers mirror had been knocked by a car going past, noticed today that the indicator on the mirror isn't flashing, I have no warnings on the dash to do with bulbs etc, and it all folds in properly and adjusts electronically fine, do you think the impact may of just buggered all the bulbs? Or is it something else??
Thankyou

 

[TomsAmg]

Quick update :
Stripped mirror down, disconnected the 2 plugs that connect to the indicator cluster In te mirror, they looked very corroded, cleaned up with sand paper and plugged back in, but still no joy. I didn't have any electrical cleaner unfortunately, it just seems strange that everything else is working perfectly

 

[TomsAmg]

UPDATE:
Problem solved, followed the wires from the mirror all the way own through the door, eventually traced it to a connector not connected under the carpet in the drivers footwell. Connected it all back up, and all working fine.