GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform A Diagnostic System Check - Door Systems?

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Go to Step 2

Go to Diagnostic System Check - Door Systems

2

Test the mirror motor drive circuits for opens, shorts to other circuits and to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 9

Go to Step 3

3

  1. Make sure that the door module controlling the inoperative mirror is connected to the harness connectors except the mirror harness connector.
  2. Turn ON the ignition leaving the engine OFF.
  3. Attach a voltmeter to the motor drive circuit pins for the inoperative mirror motor.

Disregarding polarity, does the voltmeter indicate the voltage specified?

9-14 V

Go to Step 8

Go to Step 4

4

While observing the voltmeter, command the mirror to move in one of the directions controlled by the inoperative mirror motor.

Disregarding polarity, does the voltmeter indicate the voltage specified?

9-14 V

Go to Step 5

Go to Step 8

5

Test the drive circuits for shorts or opens. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 9

Go to Step 6

6

Inspect for poor connections at the harness connector of the outside rear view mirror. 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 9

Go to Step 7

7

Replace the inoperative outside rear view mirror. Refer to Power Mirror Replacement .

Did you complete the replacement?

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Go to Step 9

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8

Replace the door module of the inoperative mirror. Refer to Door Control Module Replacement .

Did you complete the replacement?

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Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2