The body control module (BCM) controls the park lamp relay to ground the control circuit on the park lamp relay when the headlamp switch portion of the turn signal multifunction switch is turned to the PARK or the HEAD position. This energizes the park lamp relay, illuminating the park lamps. The park lamp relay is directly soldered to the underhood fuseblock circuit board. The replacement of the underhood fuseblock needs to be done to replace the park lamp relay.

The parklamp relay is directly soldered to the underhood fuseblock circuit board. The replacement of the parklamp relay means replacing the underhood fuseblock.

A short to ground, a short to voltage or an open in the following location may cause a malfunction to occur:

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, turn the headlamps ON with the headlamp switch portion of the turn signal multifunction switch. Observe the park lamps, the park lamps should be ON.

1. Ignition OFF, disconnect the harness connector at the inoperative park lamp.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit and ground.

⇒	If greater than 1.0 ohm, test the ground circuit for an open/high resistance.

3. Install test lamp between the signal circuit and ground. Verify that the parklamps are ON.

⇒	If the test lamp is not ON, test the signal circuit of the headlamp switch for a short to ground or an open/high resistance. If circuit tests normal, replace the BCM.

4. If all circuits test normal, test or replace the inoperative light bulb.

1. Ignition OFF, disconnect the harness connector at the inoperative component.
2. Test for less than 5.0 ohms between the signal terminal and the voltage supply terminal.

⇒	If greater than 5.0 ohms, replace the inoperative light bulb.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.