For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics
1 | Did you review the Lighting System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 | Verify that the stop lamps are inoperative. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 |

1. Apply pressure to the brake pedal, to activate the stoplamp switch.
2. Using a test lamp, check the stoplamp switch cavity 1 to ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 7

4 |

1. Connect a fused jumper wire on the stoplamp switch connector between cavity 2 and cavity 1.
2. Using a test lamp, check the junction block 1, C6 cavity 8 to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5 | Using a test lamp, check the junction block 1 C5 cavity 7 to ground. Does the test lamp illuminate? | Go to Step 10 | Go to Step 11
6 | Repair the open in the GRN/WHT wire between the stoplamp switch cavity 1 and the junction block 1, C6 cavity 6. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | --
7 | Using a test lamp, check the stoplamp switch cavity 2 to ground. Does the test lamp illuminate? | Go to Step 8 | Go to Step 9
8 | Replace the stoplamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Is the replacement complete? | Go to Step 12 | --
9 | Repair the open in the RED/WHT wire between the stoplamp switch and the junction block 2, C3 cavity 7. Refer to Wiring Repairs in Wiring Systems. Is the replacement complete? | Go to Step 12 | --
10 | Repair the open in the GRN/WHT wire between the junction block 1, C5 cavity 7 and SP450. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | --
11 | Replace the junction block 1. Is the replacement complete? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3