GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Automatic Day-Night Mirrors System Check performed?

--

Go to Step 2

Go to Automatic Day-Night Mirrors System Check

2

Are backup lamps on at all times with the vehicle not in reverse?

--

Go to Step 3

Go to Backup Lamps Always On

3

Inspect Fuse 29.

Is Fuse 29 open?

--

Go to Step 8

Go to Step 4

4

Inspect Fuse B3-B4.

Is Fuse B3-B4 open?

--

Go to Step 9

Go to Step 5

5

  1. Disconnect the inside rearview mirror connector.
  2. Turn the ignition switch to the RUN position.
  3. With a test light, backprobe between the inside rearview mirror connector terminal 1 and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 12

6

With a test light, backprobe between the inside rearview mirror connector terminal 1 and terminal 2.

Does the test light illuminate?

--

Go to Step 7

Go to Step 13

7

Inspect for a poor connection at the inside rearview mirror connector.

Is there a poor connection at the inside rearview mirror connector?

--

Go to Step 10

Go to Step 11

8

Repair a short to ground in circuit 840.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

9

Repair a short to ground in circuit 41.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

10

Repair the poor connection at the inside rearview mirror connector.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

11

Replace the inside rearview mirror. Refer to Inside Rearview Mirror Replacement for service procedure.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

12

Repair the poor connection or open in circuit 41.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

13

Repair the poor connection or open in circuit 850.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--