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?

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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 inside rearview mirror back.
  4. Shine a bright light into the sensor on the inside rearview mirror face.

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, 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. Carefully disconnect the driver outside rearview mirror face. Refer to Outside Rearview Mirror Glass Replacement .
  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.
  6. Shine a bright light into the sensor on the mirror face.
  7. Measure the voltage from the signal circuit of the driver outside rearview mirror element to a good ground.

Does the voltage measure within the specified value?

0.75-1.5 V

Go to Step 5

Go to Step 6

5

Measure the voltage from the signal circuit of the driver outside rearview mirror element to the low reference circuit of the driver outside rearview mirror element.

Does the voltage measure within the specified range?

0.75-1.5 V

Go to Step 9

Go to Step 8

6

Is the voltage greater than the specified value?

1.5 V

Go to Step 11

Go to Step 7

7

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 and correct the condition?

--

Go to Step 14

Go to Step 10

8

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 and correct the condition?

--

Go to Step 14

Go to Step 10

9

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 and correct the condition?

--

Go to Step 14

Go to Step 12

10

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 and correct the condition?

--

Go to Step 14

Go to Step 13

11

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

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

Did you find and correct the condition?

--

Go to Step 14

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12

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

Did you complete the replacement?

--

Go to Step 14

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13

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

Did you complete the replacement?

--

Go to Step 14

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14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2