For 1990-2009 cars

## Backup Lamps Always On Buick

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Backup Lights System Check? | -- | Go to Step 2 | Go to Backup Lamp System Check
2 | Disconnect the park/neutral position switch connector C1. Do the backup lamps turn off? | -- | Go to Step 3 | Go to Step 4
3 | Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E. Is the repair complete? | -- | Go to Backup Lamp System Check | --
4 | Does the vehicle have cornering lamps? | -- | Go to Step 6 | Go to Step 5
5 | Remove the perimeter lighting relay from the RH IP fuse block. Do the backup lamps turn off? | -- | Go to Step 7 | Go to Step 8
6 | Disconnect the perimeter lighting relay connector. Do the backup lamps turn off? | -- | Go to Step 7 | Go to Step 8
7 | Replace the perimeter lighting relay. Is the repair complete? | -- | Go to Backup Lamp System Check | --
8 | Repair the short to voltage in CKT 24 (LT GRN). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --

## Backup Lamps Always On Oldsmobile and Pontiac

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the entire Backup Lights System Check? | -- | Go to Step 2 | Go to Backup Lamp System Check
2 | Disconnect the park/neutral position switch connector C1. Do the backup lamps turn off? | -- | Go to Step 3 | Go to Step 4
3 | Replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E. Is the repair complete? | -- | Go to Backup Lamp System Check | --
4 | Is the vehicle equipped with lamp monitoring? | -- | Go to Step 5 | Go to Step 7
5 | Disconnect the lamp monitor control module connector C1. Do the backup lamps turn off? | -- | Go to Step 6 | Go to Step 8
6 | Inspect CKT 24 (LT GRN) for a short to voltage. Refer to Testing for Continuity in Wiring Systems. Is CKT 24 (LT GRN) OK? | -- | Go to Step 9 | Go to Step 7
7 | Repair the short to voltage in CKT 24 (LT GRN). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
8 | Inspect CKT 1524 (GRY) for a short to voltage. Refer to Testing for Continuity in Wiring Systems. Is CKT 1524 (GRY) OK? | -- | Go to Step 10 | Go to Step 11
9 | Replace the lamp monitor control module. Refer to Instrument Panel Lamp Dimmer Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Backup Lamp System Check | --
10 | Repair the short to voltage in CKT 24 (LT GRN) between C406 and S481. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --
11 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Backup Lamp System Check | --