Mirrors - Automatic Day-Night Mirror Displays OC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Inside Rearview Mirror Schematics
1	Did you review the temperature display operation of the inside rearview mirror and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Stationary Windows
2	Turn ON the ignition, with the engine OFF. Turn ON the temperature display on the inside rearview mirror. Does the temperature display show a temperature reading?	Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS	Go to Step 3
3	Turn OFF the ignition. Disconnect the ambient air temperature sensor. Connect a 3-ampere fused jumper between the signal circuit of the ambient air temperature sensor and a good ground. Turn ON the ignition, with the engine OFF. Does the temperature display show SC?	Go to Step 4	Go to Step 5
4	Turn OFF the ignition. Connect a 3-ampere fused jumper between the signal circuit and the low reference circuit of the ambient air temperature sensor. Turn ON the ignition, with the engine OFF. Does the mirror temperature display show SC?	Go to Step 7	Go to Step 6
5	Test the signal circuit of the ambient air temperature sensor for an open or for a short to battery positive voltage. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	Go to Step 11	Go to Step 8
6	Test the low reference circuit of the ambient air temperature sensor for an open or for a high resistance. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	Go to Step 11	Go to Step 8
7	Inspect for a poor connection at the harness connector of the ambient air temperature sensor. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and to CONNECTOR REPAIRS . Did you find and correct the condition?	Go to Step 11	Go to Step 9
8	Inspect for a poor connection at the harness connector of the inside rearview mirror. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and to CONNECTOR REPAIRS . Did you find and correct the condition?	Go to Step 11	Go to Step 10
9	Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement . Did you complete the replacement?	Go to Step 11	-
10	IMPORTANT: Perform Compass Calibration and Variance Procedure for the inside rearview mirror with compass. Replace the inside rearview mirror. Refer to Rearview Mirror Replacement .Did you complete the replacement?	Go to Step 11	-
11	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3