Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics | |||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |
2 |
Do the headlamps operate properly? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are the low beam headlamps always On? | Go to Step 4 | Go to Step 7 |
4 | Disconnect the headlamp switch. Did the headlamps turn OFF? | Go to Step 15 | Go to Step 5 |
5 | Test the headlamp switch headlamps on signal circuit 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 6 |
6 | Disconnect the lamp control module (LCM). Did the headlamps turn OFF? | Go to Step 11 | Go to Step 17 |
7 | Disconnect the headlamp dimmer switch. Did the headlamps turn OFF? | Go to Step 13 | Go to Step 8 |
8 | Test the headlamp switch flash to pass signal circuit of the headlamp dimmer 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 9 |
9 | Test the headlamp dimmer switch high beam signal circuit of the LCM 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 10 |
10 | Disconnect the LCM. Did the headlamps turn OFF? | Go to Step 11 | Go to Step 16 |
11 | Test the ignition 1 voltage circuit of the LCM for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 21 | Go to Step 12 |
12 | Test the headlamp alarm signal circuit of the LCM 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 14 |
13 | Inspect for poor connections at the harness connector of the headlamp dimmer 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 18 |
14 | Inspect for poor connections at the harness connector of the LCM. 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 |
15 | Inspect for poor connections at the harness connector of the headlamp 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 |
16 | Repair short to voltage in the headlamp high beam supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
17 | Repair short to voltage in the headlamp low beam supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 21 | -- |
18 | Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column. Did you complete the replacement? | Go to Step 21 | -- |
19 | Replace the LCM. Refer to Lamp Control Module Replacement . Did you complete the replacement? | Go to Step 21 | -- |
20 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . 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 2 |
