GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the B/U LP fuse.

Is the B/U LP fuse open?

--

Go to Step 2

Go to Step 3

2

  1. Repair a short in CKT 840.
  2. Inspect the system again.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

3

Inspect the sunroof fuse.

Is the sunroof fuse open?

--

Go to Step 4

Go to Step 5

4

  1. Repair a short in CKT 343.
  2. Inspect the system again.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

5

  1. Disconnect the inside rearview mirror connector.
  2. Turn the ignition switch to the RUN position.
  3. Use a test lamp in order to probe between the inside rearview mirror connector terminal 1 and ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 10

6

Use a test lamp in order to probe between the inside rearview mirror connector terminals 1 and 2.

Does the test lamp light?

--

Go to Step 7

Go to Step 11

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 8

Go to Step 9

8

  1. Repair the poor connection at the inside rearview mirror connector.
  2. Inspect the system again.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

9

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

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

10

  1. Repair the poor connection or the open in CKT 343.
  2. Inspect the system again.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

11

  1. Repair the poor connection or the open in CKT 350 between the inside rearview mirror connector terminal 2 and G302.
  2. Inspect the system again.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--