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. Turn OFF the ignition.
2. Disconnect the lighting control module (LCM).
3. Cover the ambient light sensor.
4. Measure the resistance of the ambient light sensor input circuit at the LCM connector to a good ground.

Is the resistance greater than the specified value?

31K ohms

Go to Step 3

Go to Step 8

Expose the ambient light sensor to a bright incandescent light.

Is the resistance less than the specified value?

23K ohms

Go to Step 4

Go to Step 8

1. Connect a test lamp between the power feed circuit of the LCM at the LCM connector and a good ground.
2. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

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Go to Step 5

Go to Step 12

1. Turn OFF the ignition.
2. Connect a test lamp between the Park/Gear input circuit at the LCM connector and a good ground.
3. Turn ON the ignition, with the engine OFF.
4. Place the gear selector in the PARK position.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 13

1. Turn OFF the ignition.
2. Connect a fused jumper from the battery positive voltage to the DRL Control/Headlamp Ground circuit at the LCM connector.

Do the high beam headlamps light at a reduced intensity?

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Go to Step 16

Go to Step 7

Repair the high resistance, short to ground, or open in the DRL Control/Headlamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 18

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Test the ambient light sensor signal circuit for high resistance, short to power, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 18

Go to Step 9

Test the ambient light sensor ground circuit for high resistance, short to power, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 18

Go to Step 10

Inspect for poor connections at the ambient light sensor connector. 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 18

Go to Step 11

Replace the ambient light sensor. Refer to Ambient Light Sensor Replacement .

Did you complete the replacement?

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Go to Step 18

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Repair the high resistance or open in the LCM power feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 18

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Test the Park/Gear input circuit for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 18

Go to Step 14

Inspect for poor connections at the body control module (BCM) connector. 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 18

Go to Step 15

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

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Go to Step 18

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Inspect for poor connections at the LCM connector. 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 18

Go to Step 17

Replace the LCM. Refer to Lamp Control Module Replacement .

Did you complete the replacement?

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Go to Step 18

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Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2