The light out indicator light is on.

The rear right tail light is out (all other lights work fine). But the bulb is fine.

For a test, I took the panel of lights from the right side, and plugged in the left side - all lights lit properly.

I have a wire diagram. It shows the wire goes from the tail lamp unit to the External Lamp Failure Monitoring Unit (in fuse/relay box).

Where is the External Lamp Failure Unit (ELFU)?

Do the wires actually go from the tail light unit to the ELFU? Or is there a join box some where in between.

Just trying to trace the wire to test all the connectors.

Many thanks

__________________
Thanks for the help
Bill Fisher

'86 560SL (186K) - Now a 'classic' : Registered as an Historic Vehicle
02 E430 in the stable
'14 LS460 (Lexus)
- - - - -
'95 E420 (198K) found a new home
'99 E320 (80K) (gave it's life for me as we hit a bumper)
'95 E420 (231K) Sold to a happy buyer, new to Mercedes
'90 300E (65K) Sold to an Mercedes Lover
'92 190E (215K) - retired to the salvage yard
'93 500SEL (214K) - Moved to another family, still runs like a young pup