Nicholi2007

The turn signal in the driver headlight stopped working. I swapped bulbs and nothing. The same problem persisted.

Locking and unlocking the car does not seem to matter.

I then went into the fuse box under the hood, driver side. I took out the big fuse M on the chart.

I believe this is the circuit 50 starter relay?

Per W204 Fuse Article:

Inoperative Turn Signals, Headlamps, Engine Starter Problems, etc., Have Been Reported

These are typically software issues and not related to any fuse problem

SUMMARY:

I do have an OE tune on it but perhaps there is a bad relay somewhere. Fuses are easy to spot.

Thoughts?