tim091

Hi all, newbie to MB after years in Jag land.

Getting the fast ticking indicator (turn signal) and message saying "F R indicator failure, using substitute" from time to time. Sure enough when it is displayed it is using the fog lamp as a substitute. But this is intermittent, and even when it is doing it if I lock or unlock the car the indicator bulb lights.

So I am thinking perhaps a relay problem? Anyone know which one and where it is? Or any other thoughts on the problem - module/data problem? Seeing as how it works when locking/unlocking I am thinking it is unlikely to be bulb/socket/wiring - but I will check that this weekend.

Any thoughts?

awiner

It could be as simlpe as the bulb base, wiring or it could be the front SAM that controls the blinkers.

Best way to start is have the stored codes read via Mercedes SDS (DAS/Xentry) to see what is being stored.

tim091

Thanks awiner. Trying to avoid a costly trip to get codes read if I can! Will obviously be checking bulbs/connections etc first.

tim091

To follow up: I pulled the indicator bulb and all connections were pretty much like new. I gave them all a clean with contact cleaner and a bit of wet and dry paper anyway.

So far the issue has not returned, so maybe the control module is overly sensitive to resistance changes and the tiny bit of cleaning I did sorted it.