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My wipers don't shut off fully, the delay mode comes on periodically even when shut off

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Symptoms: Window Wipers would not turn off. The low beam headlights functioned but the high beams were very dim, and oddly enough the passenger side headlights were dimmer than the driver side headlights. When the ignition key was turned to ACC all headlights were very dim but on even when the headlight switch was off.

Thoughts: All of these components were getting some power. The headlights and windshield wiper motor are all on the same circuit in the 560SL.

Suggested fixes: Combo switch (which is literally the stalk on the steering wheel that is used to do a "combination" of functions. On the 560SL the combo switch turns on the windshield wipers, turn signals, and engages the high-beam headlights). On mine I never removed the combo switch. I did examine it by pulling back a rubber seal on the left side of the steering wheel. The wires were bright, and the connections I could see where bright and clean. Also the combo switch itself "crisply" clicked between all functions. While this is a good suggestion, it was not the problem on my car. No the biggest clue for me were the "dim" headlights and constant on windshield wipers.

Fix that worked: It was suggested several times in this thread to clean the ground wires. On the 560SL they are small BROWN wires attached to small 7mm bolts at the front of the engine compartment just to the left and right of the radiator (hard to get eyes on, but not impossible). You should look for the small brown wires and sort of feel your way to the 7mm bolt. Once you find that bolt you will see the nut can be seen from outside of the engine compartment. After you find them the first time you will understand.

I used a small 7mm crescent wrench on the outside nut (easy to get to) and some finger finesse to get them off. Once off you will notice that the passenger side has 4 small wires terminating on a terminal and a second connection with a set of 2 wires. The passenger terminals sit one on top of the other on the ground bolt. The driver side has 3 wires in 1 connection. To be honest I can't read a wire diagram to save my life...I cleaned them all.

Keep us updated.

Posted on Nov 07, 2010

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