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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
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1998 gmc sierra. replaced wiper electronic control board.

Customer Question

1998 gmc sierra. replaced wiper electronic control board. Replaced combo/multifunction switch (dimmer, cruise, wiper, windsheld washer). All worked fine for 30-45 days. Suddenly when I turn on headlights, the wipers operate and left turn signal lamp lights and stays lit. Without headlights on, wipers and turn signal operate normally. I have read may be ground issue, bad control board, defective multifunction controller. I suspect multifunction controller. Bought new, but was only $70 online and local parts stores start at $160 for this part. But I hate to jump out there and spend $160 and turns out not to be the issue. Any help/advice?
Submitted: 5 months ago.
Category: GM
Expert:  john -aka eauto replied 5 months ago.

all symptoms point to the multi function switch do you have a warranty from the manufacturer/ supplier ?