If the sensor is clean, then the next thing to check is the mirror's settings menu. Some GMC vehicles allow you to change the temperature display from Celsius to Fahrenheit through the settings menu. To access the settings menu, you may need to press a button on the mirror or use the vehicle's infotainment system.
If neither of the above solutions works, then the rearview mirror may need to be replaced.
Why doesn't the dimming function work?
The dimming function in your rearview mirror may not be working for several reasons.
- The sensor is dirty: The sensor on the mirror that detects the headlights of oncoming vehicles may be dirty or dusty. This can prevent the mirror from dimming properly.
- The sensor is not working: The sensor itself may be faulty or not working properly. This can cause the mirror to not dim at all or to dim incorrectly.
- The mirror is defective: The mirror itself may be defective, causing the dimming function to not work properly.
Troubleshooting Steps:
1. Check the sensor: Inspect the sensor for any dirt or debris. If it's dirty, clean it gently with a soft cloth or compressed air.
2. Check the wiring: Make sure that the wiring connections to the sensor are secure and free of corrosion.
3. Test the sensor: Use a multimeter to test the continuity of the sensor. If the multimeter reads an open circuit, the sensor is faulty and needs to be replaced.
4. Replace the mirror: If all else fails, the rearview mirror may need to be replaced.
If you do not feel comfortable performing these troubleshooting steps, it is best to take the vehicle to a professional for diagnosis and repair.
