MountaineerTom
LJ Enthusiast, Retired USAF Weapons Loader
Supporting Member
Ride of the Month Winner
Almost 2 years ago, I got a Gentex 177 Compass/Temperature/Auto-dimming mirror from an early 2000's Chevrolet Silverado in a salvage yard and installed it in my 2006 LJ. Mine didn't come with the harness under the defrost panel on the dash like some TJ/LJ's do, so it wasn't a plug-and-play job, but it wasn't that hard to do either. I got the mirror with connector and pigtail, sensor and connector with pigtail for about $15 if I remember correctly. I made my own harness and routed it behind the passengers side A-pillar and behind the trim at the top of the windshield. Had to make a little notch in the windshield trim panel for the harness to come through without getting pinched. I tapped into the fuse block for switched power, tapped into the reverse light so it would un-dim for a clearer image when in reverse, and run 2 wires up to the drivers side bottom part of the grill for the temp sensor (where the OEM sensor would be). Like every other vehicle I've owned or currently own, it will read high temps when sitting still for a bit.
The pin out of the connector on the mirror is as follows. I can't guarantee all are like this, but mine was.
Gentex 177 Mirror GM wiring
Pin 1 - Red/Pink, 12 volt switched power
Pin 2 - Black, Ground
Pin 3 - Light Green, Backup lights for auto dimming. Connect to violet with black tracer on gear range selector on transmission. I came across that somewhere on another forum, but what I did was ran it through the interior following factory harness on drivers side towards drivers rear taillight, tapped into white with green tracer which feeds the purple with black tracer to the reverse lights.
Pin 4 - Gray, Outside mirror dimming (not used on Jeep)
Pin 5 - Pink, Outside mirror dimming (not used on Jeep)
Pin 6 - Green/White, Temp probe
Pin 7 - Black/White, Temp probe
The pin out of the connector on the mirror is as follows. I can't guarantee all are like this, but mine was.
Gentex 177 Mirror GM wiring
Pin 1 - Red/Pink, 12 volt switched power
Pin 2 - Black, Ground
Pin 3 - Light Green, Backup lights for auto dimming. Connect to violet with black tracer on gear range selector on transmission. I came across that somewhere on another forum, but what I did was ran it through the interior following factory harness on drivers side towards drivers rear taillight, tapped into white with green tracer which feeds the purple with black tracer to the reverse lights.
Pin 4 - Gray, Outside mirror dimming (not used on Jeep)
Pin 5 - Pink, Outside mirror dimming (not used on Jeep)
Pin 6 - Green/White, Temp probe
Pin 7 - Black/White, Temp probe