GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Automatic Day/Night Mirror System Check?

--

Go to Step 2

Go to Automatic Day-Night Mirrors System Check .

2

  1. Disconnect the inside rear view mirror connector.
  2. Turn the ignition switch to the ON position.
  3. Use the DMM to measure the voltage between terminal 11 of the inside rear view mirror connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

3

  1. Locate an open or a high resistance in circuit X900.
  2. Repair the open or the high resistance in circuit X900.

Is the repair complete?

--

Go to Step 7

--

4

Use the DMM to measure the resistance between terminal 8 of the inside rear view mirror connector and a known good ground.

Is the measured resistance less than the specified value?

5 ohms

Go to Step 6

Go to Step 5

5

  1. Locate an open or a high resistance in circuit F915.
  2. Repair the open or the high resistance in circuit F915.

Is the repair complete?

--

Go to Step 7

--

6

Replace the inside rear view mirror. Refer to Inside Rearview Mirror Replacement .

Is the replacement complete?

B+

Go to Step 7

--

7

  1. Connect all connectors and components that were disconnected.
  2. Verify that the automatic day/night mirror operates properly.

Does the automatic day/night mirror operate properly?

--

System OK

Go to Step 2