For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Lighting Systems Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems
2 |

1. Turn the ignition switch to the RUN position.
2. Place the transaxle in the REVERSE position.
3. Backprobe the right IP wiring harness junction block connector C3 with a test lamp between terminal A4 (left lamp) or terminal C3 (right lamp) and ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3 |

1. Disconnect the inoperative rear lamp assembly connector.
2. Connect a test lamp between terminal A (Pontiac) or terminal B (Olds) of the left rear lamp assembly connector or terminal E (Pontiac) or terminal B (Olds) of the right rear lamp assembly connector and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4 | Replace the right IP wiring harness junction block. Is the repair complete? | -- | System OK | --
5 | Connect a test lamp between terminal C and terminal A (Pontiac) or terminal B (Olds) of the left rear lamp assembly connector or between terminal C and terminal E (Pontiac) or terminal B (Olds) of the right rear lamp assembly connector. Does the test lamp light? | -- | Go to Step 7 | Go to Step 8
6 | Repair the open in the Back-up Lamp Feed circuit between the right IP wiring harness junction block and the left or right rear lamp assembly. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | --
7 | Replace the inoperative rear lamp assembly. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement or. Is the repair complete? | -- | System OK | --
8 | Repair the open in the Ground circuit between the rear lamp assembly and ground splice pack G401 (Olds.) and G 402 (Pontiac). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | System OK | --