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. Connect a test lamp from CKT 39 (PNK) at the automatic day-night rear view mirror connector cavity 1 to ground.
  3. Place the ignition switch in the RUN position.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect a test lamp from CKT 39 (PNK) cavity 1 to CKT 1850 (BLK) at cavity 2 of automatic day-night rear view mirror connector.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

3

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

Is the repair complete?

--

System OK

--

4

Replace the automatic day-night 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 complete?

--

System OK

--