GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.

1

  1. Disconnect the power mirror switch connector.
  2. Connect a test lamp between terminal G of the power mirror switch connector and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Connect a test lamp between terminal B and terminal G of the power mirror switch connector.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

3

Use a test lamp in order to backprobe connector C3 of the left IP wiring harness junction block between terminal B10 and ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

4

Replace the power mirror switch. Refer to Outside Rearview Mirror Replacement .

Is the repair complete?

--

System OK

--

5

Repair the open in CKT 550 between the power mirror switch and ground splice pack G301. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

6

Repair the open in CKT 1840 between the left IP wiring harness junction block and the power mirror switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

7

Replace the left IP wiring harness junction block. Refer to Relay/Fuse Center Replacement .

Is the repair complete?

--

System OK

--