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Chris (aka-Moose)
Chris (aka-Moose), GMC Technician
Category: GMC
Satisfied Customers: 47693
Experience:  16 years of experience
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I was switching the mirror switch on the door on my 2014 GMC

Customer Question

I was switching the mirror switch on the door on my 2014 GMC Sierra. I guess I got the wrong switch. Smoke came out from fuse box. No burnt fuses. Can't roll down any Windows but the drivers side. Got the right switch now but that doesn't work either now. Help please. Thanks
Submitted: 1 year ago.
Category: GMC
Expert:  Chris (aka-Moose) replied 1 year ago.

Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.

First off check the MIR WINDOW MDL 5 amp fuse do both sides of it have battery voltage using the test pins on the face of the fuse?

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Customer: replied 1 year ago.
Checked the fuse and actually went through all the fuses and everything lights up. I can smell the burnt in the fuse box. Thanks
Expert:  Chris (aka-Moose) replied 1 year ago.

Remove this fuse, are the connections to it burnt or discolored and is is a 5 amp fuse?

Customer: replied 1 year ago.
It looks good. Nothing wrong with fuse
Expert:  Chris (aka-Moose) replied 1 year ago.

Thanks, ***** ***** left dash fuse box do the same check at the LT DRS fuse 30 amp and in the right dash fuse box same inspections on RT DR WINDOW MTR 30amp fuse. So far its all pointing to a failed circuit board inside the fuse box.

Customer: replied 1 year ago.
Yeah. Checked all fuses. Literally been out there checking all fuses for like last 4 hours or so. Circuit board? Does that mean I need a new fuse box? Thanks
Expert:  Chris (aka-Moose) replied 1 year ago.

That would be correct, a new fuse box, and that is just to resolve the odor. Though that repair will not address the faulty mirrors, the fuse for them is is good. The power mirror switch needs power on the red/violet and ground on the black. Are you SURE the smoke came from the fuse box? I find it odd for all the fuses effecting the 2 issues you have to not have any damage and are powered.

Customer: replied 1 year ago.
Darn! Well I'm 90% sure now I guess. Took the box off the truck and you can really smell it on the box. Like it came from there. Do you have any ideas of where else it would come from? It was shooting straight down from where the fuse cover is at on the truck. Thanks
Expert:  Chris (aka-Moose) replied 1 year ago.

Can you jump over to check the power and ground to the mirror switch, since that caused this, the fuse is powered, and its still not working. Wiring i nthe door jam or near the fuse box is what I am leaning most towards.

Customer: replied 1 year ago.
How can I do that? I'm not really sure how I do that. Thanks
Expert:  Chris (aka-Moose) replied 1 year ago.

Do you have a volt meter or test light?

Customer: replied 1 year ago.
I do have a test light
Expert:  Chris (aka-Moose) replied 1 year ago.

Unplug the mirror switch, clamp to chassis ground, and probe the wire color pin I mentioned that is power. Clamp to something powered, and probe the ground wire I mentioned to see if the switch is getting ground.

Customer: replied 1 year ago.
Sorry it got dark yesterday and couldn't finish. Did it this morning and I'm getting ground but not any power on the switch
Customer: replied 1 year ago.
If I power it straight through then the power adjuster works. So it has to do with something in the wiring under the dash I believe. Thanks
Expert:  Chris (aka-Moose) replied 1 year ago.

That is correct, its the wiring since you confirmed the MIR WINDOW MDL 5 amp fuse is good and powered. Can you trace this wire red/violet through the door jam to the fuse box to look for a break or burn.

Customer: replied 1 year ago.
Tried that and looked as far as I could and didn't see anything. Looks more levels ke I'm going to have to take it in so they can look at the issue. My window rolls down and I can use the he child lock. That's all that works on the door.
Expert:  Chris (aka-Moose) replied 1 year ago.

Best of luck at the shop. Glad I could help up to where your skill level was reached.

Expert:  Chris (aka-Moose) replied 1 year ago.

I like to stay in contact with my customers that appear not pleased, still working on the concern, or have not rated yet. I assume you were not pleased with my help. I hate that you have spent money to get an answer but left not happy. Can you tell me why, or can I help more. If its more help you need just reply and we can pick up where we left off. I am also sending an offer allowing me to upload diagrams or repair guides if that helps.

Thanks Chris