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 | Turn ON the headlamps. Do both low beam headlamps illuminate? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||
3 | Is only one low beam headlamp inoperative? | Go to Step 8 | Go to Step 4 | ||||||
4 | Are the park lamps ON? | Go to Step 5 | Go to Step 6 | ||||||
5 |
Does the test lamp illuminate as expected? | Go to Step 11 | Go to Step 13 | ||||||
6 | Using a scan tool, observe the Low Beam Switch Input parameter. Does the parameter indicate ON? | Go to Step 12 | Go to Step 7 | ||||||
7 | Test the headlamp switch headlamps ON signal, and the ground circuit of the headlamp switch for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 18 | Go to Step 10 | ||||||
8 | Test the low beam headlamp voltage supply and ground circuits of the inoperative headlamp for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 18 | Go to Step 9 | ||||||
9 | Inspect for a poor connections at the harness connector of the inoperative headlamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 18 | Go to Step 14 | ||||||
10 | Inspect for a poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 18 | Go to Step 15 | ||||||
11 | Inspect for a poor connections at the harness connector of the 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 18 | Go to Step 16 | ||||||
12 | Inspect for a poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 18 | Go to Step 17 | ||||||
13 |
Important: The BCM may need to be reset if a short to voltage is repaired. To reset the BCM, remove the STOP/TURN and the CHMSL/BACKUP fuses in the instrument panel (I/P) fuse panel for 10 seconds. with the ignition key in the OFF position. Repair the low beam relay control circuit of the BCM for the following:
Refer to Wiring Repairs . Did you complete the repair? | Go to Step 18 | -- | ||||||
14 | Replace the inoperative low beam headlamp. Refer to Headlamp Bulb Replacement . Did you complete the replacement? | Go to Step 18 | -- | ||||||
15 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | Go to Step 18 | -- | ||||||
16 | Replace the low beam relay. Refer to Relay Replacement Did you complete the replacement? | Go to Step 18 | -- | ||||||
17 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 18 | -- | ||||||
18 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | ||||||
