We have a customer's '94 SL600 at the shop now which is exhibiting a strange problem in that when you turn on the parking or head lights, the headlamp washer pump starts running and won't stop until the key is turned off. If you just activate the right side parking light independently of the other one, the pump still comes on (or at least is energized). Washers work normally when the headlamp washing system isn't activated. Also, the right side headlamp wiper motor doesn't park itself every time. A problem like this seems to me like a bad headlight wiper motor. This car does need an engine harness and LH control units but that should be a totally separate problem. Since we primarily deal with vintage Mercs, I'd love some insight on this problem from you "modern" car guys!

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Regards,
Aaron