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Old 12-08-2011, 03:42 AM
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Join Date: May 2007
Location: Syracuse, NY (way upstate)
Posts: 107
fan and wipers stay on when car is shut off w115

Hello I have a w115 1975 300d , My heater fan, and wipers will stay on when I shut off the car. It has been this way al long as I have owned this car but I don't think MB designed it this way and suppose it must be an electrical problem.

If it is an electrical problem, any suggestions on which relay goes to these things and where it is located and how to test it. If not a relay, would it be the ignition switch? Or any other ideas?

Much Thanks,

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Old 12-08-2011, 06:14 PM
JimFreeh's Avatar
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Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,366
If I had to guess....

... Two unrelated systems would have me thinking a common point.

Perhaps the "ignition" key switch is not giving a full turn to the switch.

There is a flat pot metal jumper between the key and the switch, and if it's broken the key would not fully turn the switch off.

Verify with a wiring diagram and a meter from under the dash to see if the switch is shutting power off.

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Old 12-09-2011, 10:52 AM
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agree OR someone rewired them to hot all the time ?? not sure why one would do that but you never know, would be easy to see
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Old 12-09-2011, 04:23 PM
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Join Date: May 2007
Location: Syracuse, NY (way upstate)
Posts: 107
The ignition switch works, but now how it is supposed to. most accessories turn off when the switch is off. But the ignition switch does not have a working start position (no "start" position where you feel spring tension). The previous owner put in a manual starter button, most likely because of that.

Suppose the key part of the ignition switch need replacing to fix that no spring tension problem. But let me know your thoughts. Any way to test if the electronic part of the ignition switch is good or not?

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