For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Component Connector End Views .
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle .
2 | Observe the stop lamps while pressing the brake pedal. Does the system operate normally? | Go to Testing for Electrical Intermittents . | Go to Step 3
3 | Are all the stop lamps inoperative? | Go to Step 6 | Go to Step 4
4 | Test the supply voltage circuit of the inoperative lamp for high resistance, an open, or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | System OK | Go to Step 5
5 | Test the ground circuit of the inoperative lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | System OK | Go to Step 8
6 | Test the battery positive circuit of the stop lamp switch for high resistance, an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | System OK | Go to Step 7
7 | Test the following circuits for a short to ground, high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

• | The TCC brake signal

• | The stop lamp supply voltage

• | The CHMSL supply voltage

Did you find and correct the condition?

System OK

Go to Step 9

8 | Inspect for poor connections at the harness connector of the bulb or centre high mount stop lamp (CHMSL). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | System OK | Replace the stop lamp. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement or High Mount Stop Lamp Replacement .
9 | Inspect for poor connections at the harness connector of the switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | System OK | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement .