Step | Action | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Master Electrical Component List | |||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||||
2 |
Do the headlamps turn OFF? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||||
3 | Rotate the headlamp switch to the auto lamps OFF position and release the switch. Do the headlamps remain ON? | Go to Step 6 | Go to Step 4 | ||||||||
4 | Test the ambient light sensor signal and ground circuits of the ambient light sensor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 5 | ||||||||
5 | Test the ambient light sensor signal circuit of the ambient light sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 13 | ||||||||
6 | Are the park lamps also illuminated? | Go to Step 9 | Go to Step 7 | ||||||||
7 | Test the following circuits for a short to voltage:
Did you find and correct the condition? | Go to Step 20 | Go to Step 8 | ||||||||
8 | Test the headlamp low beam relay control circuit of the body control module (BCM) for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 12 | ||||||||
9 | Using a scan tool, observe the following parameters:
Does any parameter indicate ON? | Go to Step 10 | Go to Step 14 | ||||||||
10 |
Does the parameter switch to OFF? | Go to Step 15 | Go to Step 11 | ||||||||
11 | Test the following circuits of the BCM for a short to ground as appropriate:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 14 | ||||||||
12 | Inspect for poor connections at the harness connector of the high or low beam relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | ||||||||
13 | Inspect for poor connections at the harness connector of the ambient light sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | ||||||||
14 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 18 | ||||||||
15 | Inspect for poor connections at the harness connector of the headlamp or multifunction switch as appropriate. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | ||||||||
16 | Replace the appropriate high or low beam relay. Refer to Circuit Protection - Fusible Links . Did you complete the replacement? | Go to Step 20 | -- | ||||||||
17 | Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement . Did you complete the replacement? | Go to Step 20 | -- | ||||||||
18 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | -- | ||||||||
19 | Replace the multifunction or headlamp switch as necessary. Refer to Turn Signal Multifunction Switch Replacement or Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 20 | -- | ||||||||
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | ||||||||
