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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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2007 gmc heated mirror module


Could have a DDS an PDS .depends on what RPO code yours has >
Outside Mirror Description and Operation (with RPO DL3)
Or
Outside Mirror Description and Operation (without RPO DL3)
Without
Heated Outside Rearview Mirror Operation
The REAR DEFOG relay controls the operation of the heated outside rearview mirrors. When rear window defogging is requested, the REAR DEFOG relay is energized and B+ is applied to the supply voltage circuit of the mirror heater element, located in the mirror face. A constant ground is also applied to the mirror face. Current will pass through the mirror heater element, warming the mirror, so long as the rear window defogger is commanded ON.

With
Heated Outside Rearview Mirror
The DDS and PDS control the activation of the mirror heaters. Upon receiving a serial data message indicating a request for heated mirrors, the DDS and PDS, will apply voltage to the mirror heater element supply voltage circuit. The mirror heaters will remain active until a new message is received indicating rear defogger is to be deactivated.
The power mirror system consists of the following components:
• Driver Door Switch (DDS)--An electronic control module with integrated switches and requires programming when replaced
• Passenger Door Switch (PDS)--An electronic control module with integrated switches, requires programming when replaced
• Power Mirror Direction Switch--Integrated into DDS and is a four position momentary switch that provides a signal input to the DDS for up, down, left/extend and right/retract with a mirror switch activation
• Mirror Select Switch--Integrated into DDS and is a three position switch that allows the operator to select the left or right mirror and also a neutral/fold position
• Mirror Extend/Retract Switch--Integrated into DDS and is a two position switch that allows the operator to select the mirror extend or mirror retract position
• Left Outside Power Mirror--Contains both the vertical and horizontal mirror motors
• Right Outside Power Mirror--Contains both the vertical and horizontal mirror motors
• Body Control Module--An electronic control module that requires programming when replaced, serves as the power mode master and is the main message handler
• Horizontal and Vertical Position Sensors, if equipped with memory mirrors--Supplied a 5-volt and low reference by the DDS/PDS and provide a variable voltage signal to the DDS/PDS that is proportional to mirror position
• Folding Mirror Motor, in each of the outside mirrors, if equipped with power fold mirrors--Provides extend and retract movements of the mirror and is serviced as a complete mirror assembly
Your best bet mite be to take to a qualified repair shop , i really don't think you'll be able to do anything with it.
Do you have wiring diagrams so you know which wires to test ,do you know how to do electrical testing ?
The Driver Door Switch (DDS) and Passenger Door Switch (PDS) supply voltage to the outside rearview mirror heater elements upon receipt of a serial data message from the HVAC module indicating that the rear defrost system is active. The door switch supplies B+ through the driver/passenger mirror heating element supply voltage circuit when a request is seen. Ground is applied through the driver/passenger mirror heating low reference circuit.

Sep 15, 2017 | 2007 GMC Sierra 2500HD

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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