Installing a Gentex Compass/Temp/Auto-dim mirror

Old 01-28-2014, 02:39 PM
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Location: Washington, MO
Posts: 1,056
Year: 2000
Model: Cherokee
Engine: 4.0
Default Installing a Gentex Compass/Temp/Auto-dim mirror

Once I had one of these mirrors I got hooked. They are very well made, a bit wider and thicker than the factory one. The auto-dim is nice but the compass and temp is the real reason to get one.

These mirrors can be found in almost any GM 96 and newer, I think. Mostly they'll be in full size trucks but can even come from Saturn Vue's so check the yards. I got the mirror for $40 with a temp probe and connector. I elected to get a install kit off ebay for another $50. This included everything shown with my mirror here. It made the job really easy and saved a lot of time, but you can use any 18-20 gauge wire.

4 wires
switched power
2 prob wires

Here's what I started with (speedo gear not required!)

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I mounted the prob behind the bumper and grille in the center to keep it clean and away from engine bay heat.
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Run those 2 wires from the prob to the mirror. I poked a new hole through the firewall. I'm going to use the same hole to run my amp power wire later.
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This pic, these are the other wires that go to the mirror. The trick is to hide them. Make like you're flossing your teeth to get them behind the dash like shown. From there, run them up your a-pillar.
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Not shown, but you need switched power and a ground going to the mirror too. I just tapped the red and black wire coming from the 12v accessory.

From the a-pillar to the headliner, no wires should be showing.
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The mirror will use your existing mount, just screw it on. Use the plastic guide to cover the wires coming down from the headliner.
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Soon as you plug it in, it should work. But you may need to circle the lot to get the compass to register.
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