GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Automatic Day-Night Mirrors Schematics

1

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

Go to Step 2

Go to Symptoms - Stationary Windows

2

Does the automatic day-night feature of the inside rearview mirror operate normally?

Go to Step 3

Go to Automatic Day-Night Mirrors Inoperative

3

  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the compass.
  3. Verify that the compass is inaccurate or the letter C or Cal is displayed.

Does the compass operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 4

4

Is the compass display totally blank?

Go to Step 8

Go to Step 5

5

Is the letter C or Cal displayed on the mirror?

Go to Step 6

Go to Step 7

6

Perform the Compass Calibration procedure. Refer to Compass Calibration and Magnetic Variance .

Is the compass accurate and operating properly?

Go to Step 10

Go to Step 7

7

Perform the Compass Variance procedure. Refer to Compass Calibration and Magnetic Variance .

Is the compass accurate and operating properly?

Go to Step 10

Go to Step 8

8

Inspect for a poor connection at the harness connector of the inside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

9

Important: Perform the Compass Calibration and Variance procedure for the inside rearview mirror with compass.

Replace the inside rearview mirror with compass. Refer to Inside Rearview Mirror Replacement .

Did you complete the replacement?

Go to Step 10

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3