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?

--

Go to Step 2

Go to the Diagnostic System Check - Door Systems

2

Does the inside rear view EC mirror operate?

--

Go to Step 3

Go to Outside Mirrors Automatic Day-Night Feature Inoperative in Stationary Windows

3

  1. Turn the ignition OFF.
  2. Disconnect the DDM 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 correct the concern?

--

Go to Step 11

Go to Step 4

4

  1. Reconnect the inside rear view mirror connector.
  2. Operate the electrochromatic mirrors.
  3. Measure the voltage between the EC feed and return circuits to the DDM.

Is the voltage within the specified range?

1.2-1.5 V

Go to Step 5

Go to Step 6

5

  1. Turn the ignition OFF.
  2. Measure the resistance of the outside rear view mirror EC feed circuit through the DDM from the body harness connector to the mirror harness connector.
  3. Measure the resistance of the outside rear view mirror EC return circuit thorough the DDM from the body harness connector to the mirror harness connector.

Is the value equal to or less than specified?

1 ohms

Go to Step 8

Go to Step 10

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 11

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 11

--

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 11

Go to Step 9

9

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

Did you complete the replacement?

--

Go to Step 11

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10

Replace the DDM. Refer to Door Control Module Replacement .

Did you complete the replacement?

--

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2