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 Power Door Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the Auto Day-Night mirror.
  3. Cover the sensor on the inside rearview mirror back (facing the front window).
  4. Shine a bright light into sensor on the inside rearview mirror face (facing the rear window).

Does inside mirror change state?

--

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 inside rearview mirror face (facing the rear window), observe the LH outside rearview mirror.

Does the LH outside 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 of the LH outside rearview mirror.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the Auto Day-Night mirror.
  5. Cover the sensor on the inside rearview mirror back (facing the front window).
  6. Shine a bright light into sensor on the inside rearview mirror face (facing the rear window).
  7. Measure the voltage between the signal circuit of the LH outside rearview mirror element and the ground circuit of the LH outside mirror element.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 6

Go to Step 5

5

Measure the voltage between the signal circuit of the LH outside mirror element to a good ground.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 8

Go to Step 7

6

  1. Turn OFF the ignition.
  2. Carefully disconnect the LH outside rearview mirror face. Refer to Outside Rearview Mirror Glass Replacement .
  3. Reconnect the harness connector of the LH outside rearview mirror.
  4. Turn ON the ignition, with the engine OFF.
  5. Turn ON the Auto Day-Night mirror.
  6. Cover the sensor on the inside rearview mirror back (facing the front window).
  7. Shine a bright light into sensor on the inside rearview mirror face (facing the rear window).
  8. Measure the voltage between the signal circuit of the LH outside rearview mirror element and the ground circuit of the LH outside rearview mirror element.

Is the voltage within the specified range?

0.75-1.5 V

Go to Step 9

Go to Step 10

7

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

Did you find or correct the condition?

--

Go to Step 15

Go to Step 11

8

Test the ground circuit of the LH 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 15

Go to Step 11

9

Inspect for poor connections at the harness connector of the LH 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 15

Go to Step 12

10

Inspect for poor connections at the harness connector of the LH 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 15

Go to Step 13

11

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 15

Go to Step 14

12

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

Did you complete the replacement?

--

Go to Step 15

--

13

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

Did you complete the replacement?

--

Go to Step 15

--

14

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

Did you complete the replacement?

--

Go to Step 15

--

15

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2