GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Schematic Reference: Outside Rearview Mirror Schematics

1

Did you perform the Door Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Door Systems

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 mirror face, facing the rear window, observe the driver outside rearview mirror.

Does the driver outside rearview mirror darken?

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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 (w/A45) or C3 (w/oA45) of the driver outside rearview mirror.
  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.

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 13

Go to Step 6

6

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

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 9

Go to Step 8

7

  1. Turn OFF the ignition.
  2. Connect the harness connector of the driver outside rearview mirror.
  3. Carefully disconnect the mirror face of the driver outside rearview mirror. Refer to Mirror Face Replacement - Outside Electrochromatic .
  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 back of the inside rearview mirror.
  7. Shine a bright light into the sensor on the face of the inside rearview mirror.
  8. Measure the voltage between the signal circuit and the low reference circuit of the driver outside rearview mirror.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 10

Go to Step 11

8

Test the signal circuit of the driver outside rearview mirror 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 17

Go to Step 12

9

Test the low reference circuit of the driver outside rearview mirror 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 17

Go to Step 12

10

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 17

Go to Step 14

11

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 17

Go to Step 15

12

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 17

Go to Step 16

13

Important:: A short to battery positive voltage on the signal circuit of the driver outside rearview mirror will cause permanent damage to both the driver outside rearview mirror face and the inside rearview mirror.

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

Did you complete the repair?

--

Go to Step 17

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14

Replace the driver outside rearview mirror face. Refer to Mirror Face Replacement - Outside Electrochromatic .

Did you complete the replacement?

--

Go to Step 17

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15

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

Did you complete the replacement?

--

Go to Step 17

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16

Important: Perform the Compass Calibration and Magnetic Variance when replacing the inside rearview mirror with compass.

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

Did you complete the replacement?

--

Go to Step 17

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17

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2