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Getting OC reading on inside rearview mirror instead of tempature

My inside rearview mirror is reading OC instead of outside tempature.

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The interior rear view mirror has temperature and compass displays, but only work for a short time at start- up.I have tried unplugging the harness on the back of the mirror and cleaning contacts. It`s...


Temperature Display
The inside rearview mirror supplies a 5 volt signal circuit and low reference circuit to the ambient air temperature sensor. The inside rearview mirror monitors and records the voltage on the signal circuit of the ambient air temperature sensor. The inside rearview mirror uses this recorded voltage to display the temperature on the temperature display portion of the compass/temperature display. The temperature display will show "ICE" when the ignition is first turned on and the current temperature is 3°C (37°F) or below. The display will toggle between "ICE" and the actual outside temperature for approximately 4 minutes.
The mirror will display "OC" if the mirror senses a temperature of less than -40°C (-40°F).
the mirror will display a "SC" if the mirror senses a temperature of greater than 112°C (143°F).



Replace the inside rearview mirror with compass. Refer to Inside Rearview Mirror Replacement .

Nov 14, 2017 | 2001 Chevrolet Suburban

1 Answer

Temp reading on rearview mirror always says 0C


OC means open connection. Check connector at temperature sensor under the hood, it is located along the radiator support about at center position.

Sep 06, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Cracked mirror only, mounting and other parts are functioning well. Can I purchase a mirror only and if so, where?? This is for 2006 Pontiac Grand Prix and the passenger side mirror is cracked but works...


Hello, yes the glass can be replaced. you will need to see your local GM dealer for the glass. real simple to replace.





  • Carefully push the outside rearview mirror face on the inner edge, near the front door window glass, to allow access.
  • Insert a large flat-bladed screwdriver in the slot between mirror lens and the mounting base.
  • Grasp the mirror face firmly and pull it from the mirror body.
  • Remove the outside rearview mirror case from the outside rearview mirror housing and disconnect the heater wire, if equipped.






  • Using the palm of your gloved hand, press firmly on the center of the glass until the case seats onto the motor.
  • The mirror will make a snapping noise when properly seated.
  • Inspect the mirror for proper operation.


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    Jul 03, 2010 | 2006 Pontiac Grand Prix

    1 Answer

    Why does my rear view mirror read OC


    Open Circuit, check the wiring/connector from the mirror. If the connector is ok, you may have a bad outside temperature sensor, good luck.

    Jan 15, 2010 | 2005 Chevrolet Silverado 2500HD 2WD

    3 Answers

    Dimming mirror temp is OC


    OC means out of calibration,,, go to a big parking lot and drive in circles,this lets the compass relearn its position,if this doesnt work,,take it to the dealer there may be something else wrong

    Oct 11, 2009 | 2002 Saturn VUE

    1 Answer

    Outside temperature on rearview mirror is sayin OC on 2002 envoy


    Have you used the handy search feature? You would find that this is likely caused by one of 2 things. First, the ambient air temperature sensor may have gone bad. Secondly, wiring from the sensor to the mirror may have gone bad. Either way, you would get OC (which stands for OPEN CIRCUIT).
    Found this solution on:
    http://forums.trailvoy.com/showthread.php?t=54333KQ3SYK

    Mar 22, 2009 | 2002 GMC Envoy

    1 Answer

    OC code in rear view mirror temp field


    you could always try unplugging the battery for about ten minutes to see if that resets it. make sure you have the code for the stereo first if it requires one.

    Mar 08, 2009 | 2003 Mitsubishi Outlander

    1 Answer

    Custom Rear view mirror


    Hiya...ALL factory-installed rearview mirrors are installed with different wires due to options.
    About 6 different rearview mirrors are installed with those options such as On-Star, light, compass, and those features which use different wires....THIS CANNOT be modified with different rearview mirror....**for example, the Equinox owner attempt to pull out a factory-installed base rearview mirror and put in different one that has compass/temperature built into the rearview mirror**

    However, the wires are located inside the front headliner which requires removing the sunvisor (and possible removal of interior plastic trim part at the left/right ends of the windshield) prior to pull the headliner down, and a small metal philips or torx screw is used to secure the rearview mirror onto the bracket glued to the windshield.

    The best solution is to leave the original factory-installed rearview mirror in place.

    May 16, 2008 | 2006 Chevrolet Equinox

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