GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

1

Did you review the Automatic Day - Night Mirror Description and Operation?

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Go to Step 2

Go to Symptoms - Doors

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the automatic day - night mirror mirror.
  3. Cover the sensor on the inside rearview mirror back (facing the windshield).
  4. Shine a bright light into the sensor on the inside rearview mirror face (facing the rear window).

Does the inside automatic day - night mirror darken?

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Go to Step 3

Go to Automatic Day-Night Mirrors Inoperative in Stationary Windows

3

Does the driver outside automatic day - night mirror darken?

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

Go to Step 4

4

  1. Disconnect the driver outside rearview mirror.
  2. Connect a DMM between the automatic day - night mirror signal circuit at the vehicle harness connector and a good ground.

Is the voltage within the specified range?

0.75-1.5 volts

Go to Step 5

Go to Step 6

5

Connect a DMM between the automatic day - night mirror signal and the low reference circuit at the vehicle harness connector.

Is the voltage within the specified range?

0.75-1.5 volts

Go to Step 9

Go to Step 7

6

Test for an open or high resistance in the automatic day - night mirror signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

Go to Step 8

7

Test for an open or high resistance in the automatic day - night mirror low reference circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 12

Go to Step 8

8

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

Did you find and correct the condition?

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Go to Step 12

Go to Step 10

9

Inspect for poor connections at the outside rearview mirror harness connector. 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 12

Go to Step 11

10

Important: Perform the Compass Calibration and Magnetic Variance in Stationary Windows when replacing the inside rearview mirror.

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

Did you complete the repair?

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Go to Step 12

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11

Replace the driver outside rearview mirror. Refer to Outside Rearview Mirror Replacement .

Did you complete the repair?

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Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2