GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

Connector End View Reference: Stationary Windows Connector End Views

1

Did you review the operation of the automatic day-night feature of the driver outside rearview mirror and perform the necessary inspections?

--

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 feature of the inside rearview mirror.
  3. Cover the sensor on the mirror back, facing the front window.
  4. Shine a bright light into the sensor on the mirror face, facing the rear window.

Does the inside rearview mirror darken?

--

Go to Step 3

Go to Automatic Day-Night Mirrors Inoperative in Stationary Windows

3

While shining a bright light into the sensor on the face of the inside rearview mirror, observe the driver outside rearview mirror.

Does the driver outside rearview mirror darken?

--

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

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Disconnect the harness connector C2 of the driver door module (DDM).
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the automatic day-night feature of the inside rearview mirror.
  5. Cover the sensor on the mirror back, facing the front window.
  6. Shine a bright light into the sensor on the mirror face, facing the rear window.
  7. Measure the voltage between the signal circuit and the low reference circuit of the driver outside rearview mirror element.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 7

Go to Step 5

5

Is the voltage greater than the specified value?

1.5 V

Go to Step 18

Go to Step 6

6

Measure the voltage between the signal circuit of the driver outside rearview mirror element and a good ground.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 13

Go to Step 12

7

  1. Turn OFF the ignition.
  2. Connect the harness connector C2 of the DDM.
  3. Carefully disconnect the mirror face of the driver outside rearview mirror. Refer to Outside Rearview Mirror Glass Replacement .
  4. Turn ON the ignition, with the engine OFF.
  5. Turn ON the automatic day-night feature of the inside rearview mirror.
  6. Cover the sensor on the mirror back, facing the front window.
  7. Shine a bright light into the sensor on the mirror face, facing the rear window.
  8. Measure the voltage between the signal circuit and the low reference circuit of the driver outside rearview mirror element.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 14

Go to Step 8

8

Is the voltage greater than the specified value?

1.5 V

Go to Step 18

Go to Step 9

9

  1. Turn OFF the ignition.
  2. Disconnect the harness connector C3 of the DDM.
  3. Measure the resistance of the signal circuit of the driver outside rearview mirror element between the driver outside rearview mirror face and the DDM.

Is the resistance less than the specified value?

3 ohms

Go to Step 10

Go to Step 15

10

Measure the resistance between the signal circuit of the driver outside rearview mirror element to a good ground.

Is the resistance within the specified range?

OL

Go to Step 11

Go to Step 15

11

Measure the resistance of the low reference circuit of the driver outside rearview mirror element between the driver outside rearview mirror face and the DDM.

Is the resistance less than the specified value?

3 ohms

Go to Step 17

Go to Step 15

12

Test the signal circuit of the driver outside rearview mirror element for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find or correct the condition?

--

Go to Step 23

Go to Step 16

13

Test the low reference circuit of the driver outside rearview mirror element for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find or correct the condition?

--

Go to Step 23

Go to Step 16

14

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

Did you find or correct the condition?

--

Go to Step 23

Go to Step 19

15

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

Did you find or correct the condition?

--

Go to Step 23

Go to Step 20

16

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

Did you find or correct the condition?

--

Go to Step 23

Go to Step 21

17

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 or correct the condition?

--

Go to Step 23

Go to Step 22

18

Important:: A short to voltage in the signal circuit of the driver outside rearview mirror element will cause permanent damage to both the driver outside rearview mirror and the inside rearview mirror element.

Repair the short to voltage in the signal circuit of the driver outside rearview mirror element. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

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19

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

Did you complete the replacement?

--

Go to Step 23

--

20

Replace the driver outside rearview mirror. Refer to Power Mirror Replacement .

Did you complete the replacement?

--

Go to Step 23

--

21

Important: Perform the calibration procedure for the inside rearview mirror. Refer to Compass Calibration and Magnetic Variance in Stationary Windows.

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

Did you complete the replacement?

--

Go to Step 23

--

22

Replace the DDM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Is the replacement complete?

--

Go to Step 23

--

23

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2