GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Inside Rearview Mirror Schematics or Instrument Cluster Schematics

Connector End View Reference: Displays and Gages Connector End Views

1

Did you review the compass operation of the inside rearview mirror and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Mirrors

2

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

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 has one of the following conditions:
  4. • An incorrect reading on the display.
    • The letter "C" or "CAL" is displayed.
    • The compass display is blank.

Does the compass have one of the conditions mentioned above?

Go to Step 4

Go to Testing for Intermittent Conditions and Poor Connections

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 magnetic variation adjustment 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 to Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

9

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

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

Did you complete the replacement?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3