Stop Lamps Inoperative Hydraulic Brakes
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | |||
1 | Did you review the stop lamp operation and perform the necessary inspections? | Go to Step 2 | |
2 | Press down the brake pedal. Do the stop lamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 10 |
5 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 6 |
6 | Does the fuse in the jumper wire open? | Go to Step 11 | Go to Step 12 |
7 |
Does the left stop lamp illuminate? | Go to Step 9 | Go to Step 13 |
8 | Inspect for poor connections at the stop lamp 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 16 | Go to Step 14 |
9 | Inspect for poor connections at the hazard flasher. 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 16 | Go to Step 15 |
10 | Repair an open, high resistance, or short to ground in the voltage input circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
11 | Repair a short to ground in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
12 | Repair an open or high resistance in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
13 | Repair an open or high resistance in the ground circuit of the stop lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
14 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement? | Go to Step 16 | -- |
15 | Replace the hazard flasher. Did you complete the replacement? | Go to Step 16 | -- |
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Stop Lamps Inoperative Air Brakes
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics | |||
1 | Did you review the stop lamp operation and perform the necessary inspections? | Go to Step 2 | |
2 |
Do the stop lamps illuminate for both actions? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are the stop lamps inoperative from the trailer hand brake only? | Go to Step 9 | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 5 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 15 |
6 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 7 |
7 | Does the fuse in the jumper wire open? | Go to Step 16 | Go to Step 17 |
8 |
Does the left stop lamp illuminate? | Go to Step 13 | Go to Step 18 |
9 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 19 |
10 | Connect a fused jumper wire between the voltage input circuit of the trailer stop lamps switch connector and the brake switch input circuit of the trailer stop lamps switch connector. Do the stop lamps illuminate? | Go to Step 14 | Go to Step 11 |
11 | Does the fuse in the jumper wire open? | Go to Step 20 | Go to Step 21 |
12 | Inspect for poor connections at the stop lamp 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 25 | Go to Step 22 |
13 | Inspect for poor connections at the hazard flasher. 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 25 | Go to Step 23 |
14 | Inspect for poor connections at the trailer stop lamps 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 25 | Go to Step 24 |
15 | Repair an open, high resistance, or short to ground in the voltage input circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
16 | Repair a short to ground in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
17 | Repair an open or high resistance in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
18 | Repair an open or high resistance in the ground circuit of the stop lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
19 | Repair an open, high resistance, or short to ground in the voltage input circuit of the trailer stop lamps switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
20 | Repair a short to ground in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
21 | Repair an open or high resistance in the brake switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 25 | -- |
22 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Air Brakes. Did you complete the replacement? | Go to Step 25 | -- |
23 | Replace the hazard flasher. Did you complete the replacement? | Go to Step 25 | -- |
24 | Replace the trailer stop lamps switch. Refer to Trailer Stop Lamp Switch Replacement in Air Brakes. Did you complete the repair? | Go to Step 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
