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 the Diagnostic System Check - Door Systems

2

Does the inside rear view mirror electrochromatic system operate?

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Go to Step 3

Go to Symptoms in Stationary Windows

3

  1. Turn the ignition OFF.
  2. Disconnect the driver door module harness connectors.
  3. Disconnect the inside rear view mirror harness connector.
  4. Test the EC circuits between the DDM and the inside rear view mirror. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and repair the concern?

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Go to Step 12

Go to Step 4

4

  1. Reconnect the inside rear view mirror harness connector.
  2. Operate the electrochromatic inside rear view mirror.
  3. Measure the voltage between the EC feed circuit and the EC return circuit at the DDM body harness connector.

Is the voltage within the specified range?

1.2-1.5 V

Go to Step 5

Go to Step 6

5

  1. Disconnect the mirror harness connector from the DDM.
  2. Disconnect the body harness connector from the DDM.
  3. Measure the resistance of the outside rear view mirror EC feed and return circuits through the DDM from the body harness connector to the mirror harness connector. Refer to Circuit Testing in Wiring Systems.

Did you find a concern?

--

Go to Step 11

Go to Step 9

6

Inspect for poor connections at the harness connector of the inside 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?

--

Go to Step 12

Go to Step 7

7

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

Did you complete the replacement?

--

Go to Step 12

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8

Inspect for poor connections at the harness connector of the DDM. 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 9

9

Inspect for poor connections at the harness connector of the DDM. 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 10

10

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

Did you complete the replacement?

--

Go to Step 12

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11

Replace the DDM. Refer to Door Control Module Replacement - Front .

Did you complete the replacement?

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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