GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic chart should only be used if the dimming function is operational.

1

Did you review the Automatic Day-Night Mirror Operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify the fault is present.

Does the system operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Turn ON the ignition with the engine OFF.

Is the mirror display totally blank?

--

Go to Step 7

Go to Step 4

4

Is the letter C displayed on mirror?

--

Go to Step 5

Go to Step 6

5

Perform the Compass Calibration procedure. Refer to Compass Calibration Description .

Is the compass operating properly and accurate?

--

Go to Step 8

Go to Step 6

6

Perform the Compass Variance procedure. Refer to Compass Variance Setup Description .

Is the compass operating properly and accurate?

--

Go to Step 8

Go to Step 7

7

  1. Replace the automatic day-night mirror with compass. Refer to Inside Rearview Mirror Replacement .
  2. Perform the Compass Calibration and the Compass Variance procedures. Refer to Compass Calibration Description and Compass Variance Setup Description .

Did you complete the replacement?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3