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Re: winsheild wipers quit working~2003 envoy
Yes there is a campaign on the wiper motors , sometimes if you slap the w/w motor and it comes on thats pretty much all it takes to condem it . i believe all that really is at fault is the little circuit board and rain cover . as for where the fuse is do you have the owners manual , i would look there , or test all fuses with a test light , very simple procedure .
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try changing the wiper relay first and check out the fuses if all is good then the motor itself may have seized or the worm drive may be worn or broken check the toothed spline where the wiper blade attaches the splines may be smooth or broken which will stop the blades moving back and forth
For the I6 engine there is a relay for low beams, it's relay # 46. Switch it with relay #45 (runs the fan, same model relay) and see if your lights now come on. These 2 relays are the only 2 black ones in there (part # 15016745). Also, try to clean the contacts very well on the fuse box and the relay. If not, you may have some frayed wiring in the harness.
By the way, the high beam relay is #43, the gray one next to the windshield wiper relay #42.
Have you checked the wire harness that goes between the hatch and the body? The constant opening and closing weakens the wires. Could also be the ground wire, I believe is inside the hatch. It could have come undone. If you have an owners manual, it should guide you to the defogger fuse. Hope this helps. Best wishes.