Schematic Reference: Exterior Lights Schematics

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

1

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Turn OFF the ignition.
2. Observe the park lamps.
3. 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. Place the ignition in the ON position, with the engine OFF.
3. Verify the park lamps are turned OFF.
4. With the scan tool, observe the Park Lamp Switch parameter in the BCM Exterior Lamps data list.

Does the data parameter display OFF?

Go to Step 5

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the multifunction switch connector C3.
3. Place the ignition in the ON position, with the engine OFF.

Does the Park Lamp Switch Input Data parameter display OFF?

Go to Step 9

Go to Step 8

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

Do the park lamps turn OFF?

Go to Step 6

Go to Step 12

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

Did the test lamp turn ON and OFF?

Go to Step 10

Go to Step 7

Test the control circuit of the park lamp 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 17

Go to Step 11

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 17

Go to Step 11

Inspect for poor connections at the harness connector of the multifunction 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 17

Go to Step 14

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 15

Inspect for poor connections at the harness connector of the BCM. 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 16

Test for 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 find and correct the condition?

Go to Step 17

Go to Step 13

Replace the underhood electrical center. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 17

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Replace the multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 17

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Replace the park lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 17

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

Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating 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