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My front windshield washer won't work I pulled the pump and applied 12V and works fine. I put a volt meter on the plug that feeds the pump and discovered it is only receiving 3v when the switch is activated. I though it could be a problem with the switch on the steering column or perhaps the Multiplex control unit. Any thought? I haven't been able to figure out where the Multiplex unit is
 

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Nobili spiritus embiggens pequeño sparus tyre.
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Or mice or other rodents chewing on your wires. They apparently get a buzz from that. Test wire continuity with a multimeter.
 

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My front windshield washer won't work I pulled the pump and applied 12V and works fine. I put a volt meter on the plug that feeds the pump and discovered it is only receiving 3v when the switch is activated. I though it could be a problem with the switch on the steering column or perhaps the Multiplex control unit. Any thought? I haven't been able to figure out where the Multiplex unit is
The MICU is in the under dash fuse box.
145810
 
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