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 the headlamp switch to the PARK position.
4. With a scan tool observe the park lamp switch input parameter in the data list.

Does the scan tool display ON status?

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?

Go to Step 20

Go to Step 10

1. Disconnect the headlamp switch.
2. Connect a fused jumper wire from the park lamp switch input circuit to a good ground.
3. With a scan tool observe the park lamp switch input parameter in the data list.

Does the scan tool display ON status?

Go to Step 5

Go to Step 6

1. Connect a fused jumper wire from the park lamp switch input circuit to the headlamp switch ground circuit.
2. With a scan tool observe the park lamp switch input parameter in the data list.

Does the scan tool display ON status?

Go to Step 7

Go to Step 9

Test the park lamp switch input circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 22

Go to Step 20

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 22

Go to Step 8

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 22

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Repair the ground circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 22

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1. Turn OFF the ignition.
2. Disconnect the park lamp relay.
3. Turn ON the ignition, with the engine OFF.
4. Probe the coil side feed circuit of the park lamp relay with a test lamp that is connected to a good ground.
5. With a scan tool command the park lamp relay ON.

Does the test lamp illuminate?

Go to Step 11

Go to Step 16

1. Connect a test lamp between the control circuit of the park lamp relay and the coil side feed circuit of the park lamp relay.
2. With a scan tool command the park lamp relay ON.

Does the test lamp illuminate?

Go to Step 12

Go to Step 17

Probe the switch side feed circuit of the park lamp relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 18

Connect a test lamp between the switch side load circuit of the park lamp relay and the switch side feed circuit of the park lamp relay.

Does the test lamp illuminate?

Go to Step 14

Go to Step 18

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 22

Go to Step 15

Replace the park lamp relay.

Did you complete the replacement?

Go to Step 22

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Test the coil side feed circuit of the park lamp relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 22

Go to Step 20

Test the control circuit of the park lamp relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 22

Go to Step 20

Inspect for poor connections at the rear fuse block. 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 22

Go to Step 19

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 22

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Inspect for poor connections at 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 22

Go to Step 21

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

Did you complete the replacement?

Go to Step 22

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2