When I hit the stalk switch to change from low to high beam the low goes off the the high does not engage. Hit the switch again and the low engages fine. I had the same problem with another car and it turned out to be the hi-beam relay - a quick and cheap fix. I'm sure a new stalk from MB would be more costly.Not entirely sure, but most high/low headlight functions happen in the stalk switch. Anybody else with better info ?
I did find a replacement unit and I'm awaiting its arrival. In removing the old module should I be aware of any screws, connection tabs or attachment devices? Or 'just pull it out straight up' as is plug and play? It appears from the picture for the replacement unit that there is a tab - perhaps for a set screw. The existing unit has been in there since 1997 - perhaps a shot of WD40 to make it easier to remove? If for some reason its not the module as the problem I don't want to damage the old unit. Many thanks for your help.There is no separate relay. The low and high beams are driven from the "Lamp Failure Module" - N7
Doug -I looked at the schematic this afternoon and mrelbe is correct, the high beams are driven from the "Lamp Failure Module" - N7, however there are two separate inputs, one for each side high beam, and two separate outputs from N7. I would suspect the switch in the turn signal stalk. Just my 2 cents worth. Good luck.
Always check your #8 and #9 fuses because it's the easiest and least expensive thing to do. I pulled mine and they looked fine so I reinserted them and viola my High Beams worked again when pushing the stalk forward. Problem was: the High Beams worked when pulling the stalk back into the intermittent position but not when pushing them forward into the full time position.Have you check your fuses ?
Thanks to all for the suggestions. It was the control module - I found one on E-bay for about $140 - took all of 5 minutes to install - and he said "let there be light".