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 | Place the headlamp switch in the HEAD position. Do the headlamps illuminate? | -- | Go to Step 3 | |
3 |
Do the headlamps illuminate? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
4 | Are the park lamps illuminated? | -- | Go to Step 6 | Go to Step 5 |
5 |
Does the scan tool indicate that the ambient light sensor input parameter is within the specified range? | 2.5-5.0 | Go to Step 8 | Go to Step 13 |
6 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 17 |
7 | Connect a fused jumper between the switch side ground feed circuit of the headlamp relay and the headlamp switch signal circuit of the headlamp relay. Do the headlamps illuminate? | -- | Go to Step 14 | Go to Step 18 |
8 | Is the park brake indicator in the Instrument Panel Cluster (IPC) ON? | -- | Go to Brake Warning Indicator Always On in Hydraulic Brakes | Go to Step 9 |
9 |
Does the scan tool indicate that the Lights On Chime Input parameter is ON? | -- | Go to Step 16 | Go to Step 10 |
10 |
Do the park lamps operate from the headlamp switch? | -- | Go to Step 11 | Go to Park Lamps Inoperative |
11 |
Does the test lamp illuminate? | -- | Go to Step 16 | Go to Step 12 |
12 | Test for an open or high resistance in the exterior lamps OFF input circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 15 |
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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 19 |
14 | Inspect for poor connections at the harness connector of the headlamp relay. 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 23 | Go to Step 20 |
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 23 | Go to Step 21 |
16 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 22 |
17 | Repair an open or high resistance in the switch side ground feed circuit of the headlamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 23 | -- |
18 | Repair an open or high resistance in the headlamp switch signal circuit of the headlamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 23 | -- |
19 | Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement . Did you complete the replacement? | -- | Go to Step 23 | -- |
20 | Replace the headlamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | -- | Go to Step 23 | -- |
21 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the replacement? | -- | Go to Step 23 | -- |
22 |
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 replacement? | -- | Go to Step 23 | -- |
23 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
