Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Place the ignition switch in the OFF position.
2. Engage the parking brake.
3. Place the headlamp switch in the HEAD position.
4. Place the headlamp switch in the OFF position.
5. Turn ON the ignition, with the engine OFF.
6. Place the turn signal switch in the RH ON position.
7. Place the turn signal switch in the LH ON position.

Do the front turn signals illuminate?

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Go to Step 3

Go to Turn Signal Lamps Inoperative - Left or Right Side

1. Place the turn signal switch in the OFF position.
2. Disengaged the parking brake.
3. Expose the ambient light sensor to a bright incandescent lamp.
4. Wait more than 20 seconds.

Do the front turn signal lamps illuminate?

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Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 4

Are the automatic headlamps illuminated?

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Go to Step 5

Go to Step 6

1. Install the scan tool.
2. Expose the ambient light sensor to a bright incandescent lamp.
3. Wait more than 20 seconds.
4. With a scan tool, observe the ambient light sensor parameter in the Body Control Module (BCM) data list.

Does the scan tool indicate that the ambient light sensor input parameter is within the specified range?

0.25-2.5

Go to Step 13

Go to Step 11

Is the park brake indicator in the Instrument Panel Cluster (IPC) ON?

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Go to Brake Warning Indicator Always On in Hydraulic Brakes

Go to Step 7

1. Install the scan tool.
2. Place the headlamp switch in the OFF position.
3. With a scan tool, observe the LCM Lights On Chime Input parameter in the Body Control Module (BCM) data display inputs.

Does the scan tool indicate that the Lights On Chime Input parameter is ON?

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Go to Step 13

Go to Step 8

1. Place the ignition switch in the OFF position.
2. Toggle the headlamp switch ON and OFF.
3. Place the headlamp switch in the PARK position.

Do the park lamp operate from the headlamp switch?

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Go to Step 9

Go to Park Lamps Inoperative

1. Turn headlamp switch to the OFF position.
2. Disconnect the BCM.
3. Connect a test lamp to ground and probe the exterior lamps OFF circuit of the BCM.

Does the test lamp illuminate?

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Go to Step 13

Go to Step 10

Test for an open or high resistance in the exterior lamps OFF circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 17

Go to Step 12

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?

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Go to Step 17

Go to Step 14

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?

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Go to Step 17

Go to Step 15

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?

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Go to Step 17

Go to Step 16

Replace the ambient light sensor. Refer to Daytime Running Lamp (DRL) Ambient Light Sensor Replacement .

Did you complete the replacement?

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Go to Step 17

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

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Go to Step 17

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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 Systems.

Did you complete the replacement?

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Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2