GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Automatic Day-Night Mirrors System Check?

--

Go to Step 2

Go to Automatic Day-Night Mirrors System Check

2

  1. Turn the ignition switch to the RUN position.
  2. Inspect the 10A HVAC fuse in the UBEC.

Is the fuse blown?

--

Go to Step 3

Go to Step 6

3

Test CKT 341 (BRN) for a short to ground between the IP fuse block and cavity 1 of the automatic day/night inside mirror.

Is a short present?

--

Go to Step 4

Go to Step 5

4

Repair the short to ground in CKT 341 (BRN).

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

5

Replace the 10A HVAC fuse in the UBEC.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

6

  1. Turn the ignition switch to the RUN position.
  2. Connect a test lamp between the automatic day/night mirror cavity 1 and ground.

Does the test lamp light?

--

Go to Step 8

Go to Step 7

7

Repair the open in CKT 341 (BRN) between the IP fuse block and cavity 1 of the automatic day/night inside mirror.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

8

Connect a test lamp between B+ and cavity 2 of the automatic day/night inside rear view mirror.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9

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

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--

10

Repair the open in CKT 1850 (BLK) between the automatic day/night inside rear view mirror and G202.

Is the repair complete?

--

Go to Automatic Day-Night Mirrors System Check

--