Was the Lighting System Diagnostic System Check performed?

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. Turn OFF the headlamp switch.
4. With a scan tool observe the park lamp input parameter in the data list.

Does the scan tool display OFF status?

Go to Step 3

Go to Step 6

With the scan tool, observe the park lamp relay status.

Does the scan tool display OFF status?

Go to Step 4

Go to Step 11

1. Turn OFF the ignition.
2. Disconnect the park lamp relay.
3. Turn ON the ignition, with the engine OFF.

Did the park lamps turn off?

Go to Step 5

Go to Step 15

Connect a test lamp between the coil feed circuit and the control circuit of the park lamp relay.

Does the test lamp illuminate?

Go to Step 10

Go to Step 13

1. Turn OFF the ignition.
2. Disconnect the headlamp switch
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool observe the park lamp input parameter in the data list.

Does the scan tool display the OFF status?

Go to Step 8

Go to Step 7

Test the park lamp switch input circuit 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 17

Go to Step 11

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?

Go to Step 17

Go to Step 9

Replace the headlamp switch assembly. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 17

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Test the park lamp relay control circuit 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 17

Go to Step 11

Inspect for poor connections at the harness connector of the dash integration module. 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 17

Go to Step 12

Replace the dash integration module (DIM). Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 17

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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?

Go to Step 17

Go to Step 14

Replace the park lamp relay.

Did you complete the replacement?

Go to Step 17

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Test the power feed circuit of the park lamps for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 16

Replace the rear fuse block. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2