For 1990-2009 cars

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 (E Pontiac) 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 (D Pontiac) and terminal G (E Pontiac) 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 Underhood Fuse Block Replacement in Engine Electrical. Is the repair complete? | -- | System OK | --