You need a lamp control module? I should have one.

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Gone to the dark side

- Jeff

i'm having the same problem on an 81 300d. my drivers side low beam doesn't work, but the high beam does. now the car won't pass inspection. is the problem a fuse or a relay? Thanks

It's so easy to check the fuse that it's not even worth asking

Since you asked about the fuse, have you checked the bulb?

Sixto
87 300D

i replaced the headlight with a new one, thinking that was the problem

High and low share a ground so it can't be a bad ground. I don't have a 123 wiring diagram so I can't help you other than to suggest swapping left and right low beam fuses.

Sixto
87 300D

i'll try it, thanks for the help

If the fuses haven't been replaced in the last 10 years, replace all of them. Take a count of how many of each rating/color you need then call/email Phil through the Buy Parts -> FastLane link at the top of the page. You might find them locally at an import parts store.

Sixto
87 300D

I found an 82 240D wiring diagram. To the extent you car is the same, there is no headlight relay. Power to fuses 8 and 16 (left and right low beam) comes directly from the headlight switch. If the right low beam is working, the problem has to be a bad bus bar in the fusebox, a bad fuse or fuse holder, a bad wire to the headlight or a bad connector at the headlight... assuming the new headlight is good.

Sixto
87 300D

i swapped the fuses on the low beams with the same result. pass side works, drivers doesn't. i will order some new fuses, because i don't know when they were replaced.

Ttake a wire brush to the headlight connector. If that doesn't do it, time to use a volt meter or test light to find the break.

Sixto
87 300D