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2008 chevy trailblazer_lt
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Discussion Starter #1
Anyone know how to do rear washer switch bypass test. Rear wipers work. Fuse pump relay good. Either faulty switch or bcm. No bidirectional controls on my snap on. Says wash not requested in bcm and liftgate control module. Ty. Joe
 

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Just buy a new switch from your local parts store. If it fixes the problem, return it and buy one from rock auto for 11 dollars.
 

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2004 GMC Envoy SLT 4.2
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365 Posts
Just buy a new switch from your local parts store. If it fixes the problem, return it and buy one from rock auto for 11 dollars.
Bad advice^ .

And , most electrical devices are non-returnable .

Better to simply test the switch you have .

"Unplug the wiper motor connector. Probe the voltage supply plug with a voltmeter and make sure voltage and ground are present. Move the wiper function switch through all positions to determine proper voltage at the plug. If there is no voltage, check the voltage supply to the dash switch and check the rear wiper fuse. "
Google search .
 
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