Where might I fix rear window defrost & heated right mirror. Some connector?

Asked by Feb 21, 2017 at 07:17 PM about the 2008 Chevrolet Silverado 1500 LT1 Extended Cab 4WD

Question type: Maintenance & Repair

2008 1500 Silverado extended cab 4x4, Z71. Has rear window defrost, not
working. I put on heated mirrors. Left one works. But rear window defrost and
right mirror do not. Continuity on both checks out. No power. Is there a
connector or common wiring point that would disrupt only the rt mirror and
defrost?  Thx.

9 Answers

77,815

There would be relays to check that are in one of the fuse boxes.

1 of 1 people found this helpful.

Thanks. Relays good, fuses too. Seems neither would produce loss of only one heated mirror and rear defog. Could switch on dash have a connector behind it that separates into three directions? Seems some junction would be most likely to cause this type of issue.

Or is perhaps the problem the switch and connections in the HVAC control panel? It seems the only place that could cause these two systems to fail. I cannot find any other location that the right heated mirror and rear defogger systems would intersect.

77,815

Makes sense. May just want to move some connectors around to make a better contact. I've seen where wiring looks new but for some reason not make a connection. Always at the connectors.

1 of 1 people found this helpful.

Thanks. I just this morning pulled panel, reset connectors. No change. I haven't found color codes yet for specific circuit wires, so I don't know which connector feeds the rear defog/htd mirrors. Anyone know? The full HVAC panel is a bit costly to replace only to find out if it is the issue. If I know which connector, I'll do some cleaning etc. to try to improve circuit. (left to right 1 is empty, 2 beige, 3 black, 4 brown).

77,815

You would want to test that HVAC control panel with a digital multi meter. Like you said it would be costly to just try one.

1 of 1 people found this helpful.

Thx. My meter doesn't have tiny probes, I'll check around for one. rh

Update: black connector contains the heated mirrors and rear defog circuits - also temp and likely other. All pins good. All connectors tight. Cleaned with electronic cleaner. No change. Not a bit of power goes through circuits.

77,815

Finding a problem like this is a head ache. Follow the flow of power.

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