Does the compass work when the temperature goes out? If the compass still works then chances are that the ambient temp sensor is defective. Also, could be wiring to the sensor. If the compass goes out with the temperature then chances are the mirror itself is defective. Cheapest most common problem is the ambient temp sensor. It's behind the grill by the condenser at the front of the vehicle.
My airbag light will not cut off and my temp and compass on my rearview mirror cut off the same time it went out too... I changed the fuse because it was blown... it works for a couple of days and then cuts back off... I took it to the dealership and they did a dianogstic check and can't find the problem
SOURCE: Can't get the outside temp. showing in the inside backview mirror
Check the connector that plugs into the back of the mirror and make sure it is pushed in all the way. If that is not it, look carefully at the wires going into the connector. I had one that broke off. I had to pull the pin out of the connector and re crimp it onto the wire.
SOURCE: 2003 Chevy Silverado Interior rear veiw mirror compass and temp
sounds like a fuse blew if both went out check fuses first
SOURCE: The compass and outside temperature display for
what could be the problem,its was working just fine.
SOURCE: My 2002 Chevy Tahoe digital thermometer in the
"oc" means open circuit probably ambient sensor defective o r damaged.
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