GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the automatic day-night rear view mirror connector.
  2. Place the ignition switch in the RUN position.
  3. Connect a test lamp between the automatic day-night rear view mirror connector (cavity 1) and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect a test lamp between B+ and the automatic day-night rear view mirror connector cavity 2.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

3

Locate and repair the open in CKT  39 (PNK) between automatic day-night rear view mirror connector and the fuse.

Is the repair complete?

--

System OK

--

4

Replace the automatic day-night rear view mirror. Refer to Inside Rearview Mirror Replacement .

Is the repair complete?

--

System OK

--

5

Locate and repair the open in CKT 1850 (BLK) between the automatic day-night rear view mirror and ground.

Is the repair compete?

--

System OK

--