Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics | ||||
1 | Did you perform the Lighting System Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Do the low beams headlamps illuminate? | -- | Go to Step 3 | Go to Step 4 |
3 | Place the headlamp dimmer switch in the high beam position. Do the high beams headlamps illuminate? | -- | Go to Step 6 | Go to Step 12 |
4 | Are the high beam headlamps on at all times? | -- | Go to Step 9 | Go to Step 5 |
5 |
Do the high beam or low beam headlamps illuminate? | -- | Go to Step 8 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
6 |
Do the high beam and low beam headlamps illuminate? | -- | Go to Step 7 | Go to Step 15 |
7 |
Do the high beam and low beam headlamps illuminate? | -- | Go to Step 14 | Go to Step 18 |
8 |
Does the scan tool indicate that the ambient light sensor input parameter is within the specified range? | 0.5-2.5 | Go to Step 20 | Go to Step 19 |
9 |
Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 10 |
10 | Test for a short to ground in the headlamp high beam signal circuit of the LH and RH headlamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 16 |
11 | Test for a short to ground in the high beam signal circuit of the headlamp dimmer switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17 |
12 | Test for a short to ground in the headlamp low beam signal circuit of the LH and RH headlamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 13 |
13 | Test for a short to ground in the low beam signal circuit of the headlamp dimmer switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 16 |
14 | Repair a short to ground in the headlamp switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 21 | -- |
15 | Replace the headlamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the repair? | -- | Go to Step 21 | -- |
16 | Replace the fuse block - underhood. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems. Did you complete the repair? | -- | Go to Step 21 | -- |
17 | Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt. Did you complete the repair? | -- | Go to Step 21 | -- |
18 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? | -- | Go to Step 21 | -- |
19 | Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement . Did you complete the repair? | -- | Go to Step 21 | -- |
20 |
Important: Perform the set up procedures for the Body Control Module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the Body Control Module (BCM). Refer to Body Control Module Replacement in Body Control System. Did you complete the repair? | -- | 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 |
