Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn OFF the ignition.
2. Turn OFF the twilight delay switch.
3. Observe the park lamps.
4. Turn the park lamps ON and OFF.

Do the park lamps operate properly?

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

Go to Step 3

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Verify the park lamps are turned OFF.
4. With the scan tool, observe the Park Lamp Input parameter in the dash integration module (DIM) Inputs data list.

Does the data parameter display OFF?

Go to Step 4

Go to Step 5

1. Expose the sunload sensor assembly to a bright light.
2. Wait more than 20 seconds.
3. Turn OFF the park lamps.
4. With a scan tool, command the Parking Lamps Relay ON and OFF from the DIM Output Control data list.

Did all of the park lamps turn ON and OFF?

Go to Step 13

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the headlamp switch.
3. Turn ON the ignition, with the engine OFF.

Does the Park Lamp Switch Input data parameter display OFF?

Go to Step 11

Go to Step 9

1. Turn OFF the ignition.
2. Disconnect the Park LP relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with the engine OFF.

Do the park lamps turn OFF?

Go to Step 7

Go to Step 14

1. Turn OFF the ignition.
2. Connect a test lamp between the park lamp relay control circuit and the Park LP relay control side supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool command the Parking Lamps Relay ON and OFF.

Did the test lamp turn ON and OFF?

Go to Step 12

Go to Step 8

Test the control circuit of the Park LP relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 10

Test the park lamp switch on signal circuit of the headlamp switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 10

Test the backlight lamps control circuit of the DIM for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 13

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 18

Go to Step 15

Inspect for poor connections at the Park LP 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 18

Go to Step 16

Inspect for poor connections at the harness connector of the DIM. 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 18

Go to Step 17

Repair the short to battery positive voltage in the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 18

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 18

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Replace the Park LP relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 18

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Important: Perform the setup procedure for the DIM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 18

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2