Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | |||
1 | Did you perform the Lighting Diagnostic System Check? | Go to Step 2 | |
2 | Observe the stop lamps while pressing the brake pedal. Does the system operate normally? | Go to Testing for Electrical Intermittents in Wiring Systems | Go to Step 3 |
3 | Are all the stop lamps inoperative? | Go to Step 8 | Go to Step 4 |
4 | Is the CHMSL the only inoperative lamp? | Go to Step 10 | Go to Step 5 |
5 | Are both rear stop lamps inoperative while the CHMSL operates correctly? | Go to Step 12 | Go to Step 6 |
6 | Test the CHMSL supply voltage circuit of the inoperative lamp for high resistance, an open, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 7 |
7 | Test the ground circuit of the inoperative lamp for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 14 |
8 | 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 in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 9 |
9 | Test the stop lamp signal circuit of the stop lamp switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 16 |
10 | Test the trailer CHMSL supply voltage circuit for high resistance, an open, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 11 |
11 | Test the ground circuit of the CHMSL for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 15 |
12 | Test the CHMSL supply voltage circuit of the CHMSL for high resistance, an open, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 13 |
13 |
Does the test lamp illuminate? | Go to Step 14 | Go to Step 17 |
14 | Inspect for poor connections at the harness connector of the bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 18 |
15 | Inspect for poor connections at the harness connector of the high mount. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 19 |
16 | Inspect for poor connections at the harness connector of the switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 20 |
17 | Repair the open in the ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
18 | Replace the rear stop lamp. Refer to Tail/Turn Signal Lamp Replacement . Did you complete the replacement? | Go to Step 21 | -- |
19 | Replace the high mounted stop lamp. Refer to High Mount Stop Lamp Replacement . Did you complete the replacement? | Go to Step 21 | -- |
20 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement? | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
