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Windshield wipers don't work unless headlights are on


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I have a 2002 996 and the windshield wipers only work if the headlights are on. Some of the posts I've read indicate that the ignition switch may be the cause. Has anyone else encountered this problem? Are there relays, fuses or other thing I can check fist before opening up the dash and replacing the ignition switch?

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If you notice in the schematic the wiper motor control goes through the rain sensor control.

post-1-0-31548100-1304869195_thumb.png

I would check the rain sensor. Also the intermittent wiper relay and dash switch might pull the circuit down if they are not functioning properly.

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