For 1990-2009 cars

## Stop Lamps Inoperative Buick/Oldsmobile

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Exterior Lights System Check? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 | Backprobe the stoplamp/BTSI switch connector C2 with a test lamp from cavity A (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 7
3 |

1. Disconnect the stoplamp/BTSI switch connector C2.
2. Connect a fused jumper from the stoplamp/BTSI switch connector C2 cavity A (ORN) to cavity B (WHT).

Do all of the stoplamps light?

--

Go to Step 4

Go to Step 5

4 | Replace the stoplamp/BTSI switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Is the repair complete? | -- | Go to Exterior Lights System Check | --
5 | Inspect for an open in CKT 17 (WHT) between the stoplamp/BTSI switch and S228. Refer to Testing for Continuity in Wiring Systems. Is CKT 17 OK? | -- | Go to Step 6 | Go to Step 8
6 | Replace the turn/hazard switch. Refer to Hazard Warning Switch Replacement in Steering Wheel and Column - Tilt. Is the repair complete? | -- | Go to Exterior Lights System Check | --
7 | Repair the open in CKT 140 (ORN) between the IP fuse block and the stoplamp/BTSI switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
8 | Repair the open in CKT 17 (WHT) between the stoplamp/BTSI switch and S228. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --

## Stop Lamps Inoperative Pontiac

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Exterior Lights System Check? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 | Backprobe the stoplamp/BTSI switch connector C2 with a test lamp from cavity A (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 11
3 |

1. Disconnect the stoplamp/BTSI switch connector C2.
2. Connect a fused jumper from the stoplamp/BTSI switch connector C2 cavity A (ORN) to cavity B (LT BLU).

Do all of the stop lamps light?

--

Go to Step 4

Go to Step 5

4 | Replace the stoplamp/BTSI switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Is the repair complete? | -- | Go to Exterior Lights System Check | --
5 | Is the vehicle equipped with lamp monitoring? | -- | Go to Step 7 | Go to Step 6
6 | Repair the open in CKT 20 (LT BLU) between the stoplamp/BTSI switch and S231. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
7 |

1. Disconnect the lamp monitor control module connector C1 and connector C2.
2. Connect a fused jumper from the lamp monitor control module connector C2 cavity K (LT BLU) and connector C1 cavity F (ORN)

Do all of the stop lamps light, except the high mounted stop lamp?

--

Go to Step 8

Go to Step 9

8 | 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 Exterior Lights System Check | --
9 | Inspect for an open in CKT 20 (LT BLU) between the stoplamp/BTSI switch and S231. Refer to Testing for Continuity in Wiring Systems. Is CKT 20 OK? | -- | Go to Step 10 | Go to Step 6
10 | Repair the open in CKT 1054 (ORN) between the lamp monitor control module and S425. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
11 | Repair the open or the short to ground in the CKT 140 (ORN) wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --