Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views | |||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||
2 | Place the headlamp switch in the OFF position. Do the high and low beam headlamps operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||
3 | Are only the high beam headlamps always ON? | Go to Step 4 | Go to Step 8 | ||||
4 | Disconnect the headlamp dimmer switch. Do the high beam headlamps remain ON? | Go to Step 5 | Go to Step 10 | ||||
5 | Test the following circuits for a short to ground as applicable. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct a condition? | Go to Step 18 | Go to Step 6 | ||||
6 | Remove the HI HEADLAMP-LT and HI HEADLAMP-RT fuses from the underhood fuse block. Do the high beam headlamps remain ON? | Go to Step 12 | Go to Step 7 | ||||
7 | With a scan tool, monitor the High Beam Relay Command data parameter in the body control module (BCM) data list. Does the scan tool display On? | Go to Step 11 | Go to Step 15 | ||||
8 | Remove the LO HDLP-LT and LO HDLP-RT fuses from the underhood fuse block. Do the low beam headlamps remain always ON? | Go to Step 13 | Go to Step 9 | ||||
9 | With a scan tool, monitor the Low Beam Relay Command data parameter in the body control module (BCM) data list. Does the scan tool display On? | Go to Step 11 | Go to Step 16 | ||||
10 | 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 . Did you find and correct the condition? | Go to Step 18 | Go to Step 17 | ||||
11 | Inspect for 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 14 | ||||
12 | Repair the short to voltage in the right or left high beam headlamp supply voltage circuit. Refer to Wiring Repairs . Did you find and correct a condition? | Go to Step 18 | -- | ||||
13 | Repair the short to voltage in the right or left low beam headlamp supply voltage circuit. Refer to Wiring Repairs . Did you find and correct a condition? | Go to Step 18 | -- | ||||
14 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 18 | -- | ||||
15 | Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement . Did you complete the repair? | Go to Step 18 | -- | ||||
16 | Replace the low beam relay. Refer to Relay Replacement . Did you complete the repair? | Go to Step 18 | -- | ||||
17 | Replace the headlamp dimmer switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the repair? | 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 | ||||
