GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Heated Mirrors System Check?

--

Go to Step 2

Go to Heated Mirror System Check

2

Remove the rear defogger relay.

Does the heated mirror remain ON?

--

Go to Step 3

Go to Step 4

3

Repair the short to B+ in CKT 2267 (ORN).

Is the repair complete?

--

Go to Heated Mirror System Check

--

4

  1. Turn the ignition switch to the RUN position.
  2. Using the J 35616 , connect a test lamp between terminal 85 and terminal 86.

Does the test lamp light?

--

Go to Step 6

Go to Step 5

5

Replace the rear defogger relay.

Is the repair complete?

--

Go to Heated Mirror System Check

--

6

Test CKT 193 (WHT) for a short to ground.

Did you locate a short to ground in CKT 193 (WHT)?

--

Go to Step 7

Go to Step 8

7

Repair the short to ground in CKT 193 (WHT).

Is the repair complete?

--

Go to Heated Mirror System Check

--

8

Replace the heater and A/C controller.

Is the repair complete?

--

Go to Heated Mirror System Check

--