Diagnostic Aids
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.
The automatic day-night feature of the driver outside rearview mirror may be inoperative due to the signal circuit being shorted to battery positive voltage. When this condition occurs, both the driver outside rearview mirror and the inside rearview mirror will be in a darkened state. Both mirrors will be permanently damaged and will need to be replaced.
Mirrors - Outside Automatic Day-Night Feature Inoperative
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Outside Mirror Schematics | ||||
| 1 | Did you review the description and operation of the automatic day-night feature of the driver outside rearview mirror? | - | Go to Step 2 | Go to Symptoms - Doors |
| 2 |
|
- | Go to Step 3 | Go to MIRRORS - AUTOMATIC DAY-NIGHT INOPERATIVE |
| 3 | While shining a bright light into the sensor on the face of the inside rearview mirror, observe the driver outside rearview mirror. Does the driver outside rearview mirror darken? |
- | Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS | Go to Step 4 |
| 4 |
|
0.75-1.5 V | Go to Step 9 | Go to Step 5 |
| 5 | Is the voltage greater than the specified value? | 1.5 V | Go to Step 11 | Go to Step 6 |
| 6 | Measure the voltage between the signal circuit of the driver outside rearview mirror and a good ground. Is the voltage within the specified range? |
0.75-1.5 V | Go to Step 8 | Go to Step 7 |
| 7 | Test the signal circuit of the driver outside rearview mirror for an open or short to ground. Refer to CIRCUIT TESTING
and WIRING REPAIRS
. Did you find or correct the condition? |
- | Go to Step 14 | Go to Step 10 |
| 8 | Test the low reference circuit of the driver outside rearview mirror for an open or high resistance. Refer to CIRCUIT TESTING
and WIRING REPAIRS
. Did you find or correct the condition? |
- | Go to Step 14 | Go to Step 10 |
| 9 | Inspect for poor connections at the harness connector of the driver outside rearview mirror. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
and CONNECTOR REPAIRS
. Did you find or correct the condition? |
- | Go to Step 14 | Go to Step 12 |
| 10 | Inspect for poor connections at the harness connector of the inside rearview mirror. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
and CONNECTOR REPAIRS
. Did you find or correct the condition? |
- | Go to Step 14 | Go to Step 13 |
| 11 |
IMPORTANT:
A short to battery positive voltage on the signal circuit of the driver outside rearview mirror will cause permanent damage to both the driver outside rearview mirror face and the inside rearview mirror. Repair the short to voltage in the signal circuit of the driver outside rearview mirror. Refer to WIRING REPAIRS
.Did you complete the repair? |
- | Go to Step 14 | - |
| 12 | Replace the driver outside rearview mirror. Refer to Mirror Replacement (Power Mirror) or Mirror Replacement (Manual) . Did you complete the replacement? |
- | Go to Step 14 | - |
| 13 |
IMPORTANT:
Perform the COMPASS CALIBRATION AND VARIANCE PROCEDURE
. Replace the inside rearview mirror. Refer to REARVIEW MIRROR REPLACEMENT
.Did you complete the replacement? |
- | Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 2 |