Was the Lighting System Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With the scan tool, observe the park lamp input data parameter while turn the park lamp switch ON and OFF.

Does the data parameter change with the switch?

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Go to Step 3

Go to Step 4

With a scan tool, command the park lamp relay ON and OFF.

Do the park lamps turn ON and OFF with each command?

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Go to Step 13

Go to Step 9

1. Connect a test lamp from battery positive voltage (B+) to the park lamp input circuit at the dash integration module (DIM).
2. Turn the headlamp switch to the PARK position then OFF.

Did the test lamp turn ON and OFF?

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Go to Step 13

Go to Step 5

1. Connect a test lamp from battery positive voltage (B+) to the park lamp input circuit at the headlamp switch.
2. Turn the headlamp switch to the PARK position then OFF.

Did the test lamp turn ON and OFF?

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Go to Step 6

Go to Step 7

Repair the open in the park lamp input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 15

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Inspect for poor connections at the headlamp switch assembly. 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 15

Go to Step 8

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

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Go to Step 15

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1. Turn OFF the ignition.
2. Disconnect the park lamp relay.
3. Connect a test lamp between the park lamp relay control circuit and the park lamp relay coil feed circuit.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool command the park lamp relay ON and OFF.

Does the test lamp turn ON and OFF with each command?

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Go to Step 10

Go to Step 12

Inspect for poor connections at the park lamp relay. 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 15

Go to Step 11

Replace the park lamp relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the replacement?

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Go to Step 15

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Test the control circuit of the park lamp relay for a short to voltage 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 15

Go to Step 13

Inspect for poor connections at the dash integration module (DIM). 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 15

Go to Step 14

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

Did you complete the replacement?

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Go to Step 15

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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