Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Lighting Systems Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Do the daytime running lamps (DRL) illuminate? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 | Is the park brake indicator illuminated? | Go to Step 4 | |
4 |
Does the test lamp illuminate? | Go to Step 23 | Go to Step 5 |
5 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 14 |
6 | Connect a fused jumper wire between the switch side input circuit and the switch side output circuit of the DRL ON relay. Do the DRLs illuminate? | Go to Step 20 | Go to Step 7 |
7 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 24 |
8 | Connect a fused jumper wire between the switch side input circuit and the switch side output circuit of the DRL OFF relay. Do the DRLs illuminate? | Go to Step 9 | Go to Step 25 |
9 | Probe the coil side voltage supply circuit of the DRL OFF relay with a test lamp that is connected to ground. Does the test lamp illuminate? | Go to Step 10 | Go to Step 26 |
10 | Connect a test lamp between the coil side voltage supply circuit and the coil side control circuit of the DRL OFF relay. Does the test lamp illuminate? | Go to Step 21 | Go to Step 11 |
11 | Does the vehicle being worked on have air brakes? | Go to Step 27 | Go to Step 12 |
12 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 28 |
13 |
Does the test lamp illuminate? | Go to Step 29 | Go to Step 18 |
14 |
Does the test lamp illuminate? | Go to Step 15 | Go to Step 16 |
15 |
Does the test lamp illuminate? | Go to Step 22 | Go to Step 30 |
16 |
Does the test lamp illuminate? | Go to Step 17 | Go to Step 31 |
17 |
Does the test lamp illuminate? | Go to Step 19 | Go to Step 32 |
18 | Test for a short to ground in the coil side control circuit of the DRL OFF 2 relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 38 | Go to Step 33 |
19 | Test for a short to ground in the coil side control circuit of the lighting relay. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 38 | Go to Step 34 |
20 | Inspect for poor connections at the DRL ON relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 38 | Go to Step 35 |
21 | Inspect for poor connections at the DRL OFF relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 38 | Go to Step 36 |
22 | Inspect for poor connections at the DRL series dropping resistor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 38 | Go to Step 37 |
23 | Repair a short to ground in the coil side control circuit of the DRL ON relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
24 | Repair an open or high resistance in the switch side input circuit of the DRL OFF relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
25 | Repair an open or high resistance in the switch side output circuit of the DRL OFF relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
26 | Repair an open, high resistance, or short to ground in the coil side voltage supply circuit of the DRL OFF relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
27 | Repair an open or high resistance in the coil side control circuit of the DRL OFF relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
28 | Repair an open or high resistance in the switch side input circuit of the DRL OFF 2 relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
29 | Repair an open or high resistance in the switch side output circuit of the DRL OFF 2 relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
30 | Repair an open or high resistance in the switch side input circuit of the DRL ON relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
31 | Repair an open or high resistance in the switch side input circuit of the lighting relay. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
32 | Repair an open or high resistance in the voltage input circuit of the DRL series dropping resistor. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 38 | -- |
33 | Replace the DRL OFF 2 relay. Did you complete the replacement? | Go to Step 38 | -- |
34 | Replace the lighting relay. Did you complete the replacement? | Go to Step 38 | -- |
35 | Replace the DRL ON relay. Did you complete the replacement? | Go to Step 38 | -- |
36 | Replace the DRL OFF relay. Did you complete the replacement? | Go to Step 38 | -- |
37 | Replace the DRL series dropping resistor. Refer to Daytime Running Lamps (DRL) Resistor Replacement . Did you complete the replacement? | Go to Step 38 | -- |
38 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
