Park Lamps Always On

PARK LAMPS ALWAYS ON




DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
Battery voltage is applied at all times to the coil and switch sides of the PARK LAMP Relay located in the underhood fuse block. Ground is applied at G201 to the turn signal/multifunction switch at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp switch signal circuit to the body control module (BCM). The BCM reacts to the signal from the park lamp switch by applying ground to the park lamp relay control circuit. This energizes the PARK LAMP Relay and applies battery voltage to the PARK LPS fuse. Voltage flows through the PARK LPS fuse to all park, tail, license, and side marker lamps. Ground for the front park and side marker lamps is supplied at G101 for the left and G102 for the right. Ground for the license and right rear tail lamps is supplied at G402, and the left rear tail lamps at G400.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the park lamp relay.
2. Ignition ON, the park lamps should turn OFF.
- If the park lamps remain illuminated, repair the park lamps voltage supply circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
3. Connect a test lamp between the park lamp relay control circuit and the park lamp relay coil side supply voltage circuit at the underhood fuse block relay terminals.
4. Ignition ON, turn the park lamps ON and OFF. The test lamp should turn ON and OFF as the switch is cycled.
- If the test lamp turns ON and OFF as the turn signal/multifunction switch is cycled, replace the park lamp relay.
5. Connect the park lamp relay.
6. Ignition OFF, disconnect the BCM C1 harness connector.
7. Ignition ON, the park lamps should turn OFF.
- If the park lamps remain illuminated, repair the park lamp relay control circuit for a short to ground.
8. Ignition OFF, connect the BCM C1 harness connector.
9. Disconnect the C1 harness connector at the turn signal/multifunction switch.
10. Ignition ON, the park lamps should turn OFF.
- If the park lamps remain illuminated, repair the park lamp switch signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
11. If all circuits test normal, replace the turn signal/multifunction switch.

REPAIR INSTRUCTIONS

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

- Multifunction, Turn Signal Switch Replacement
- Park/Turn Signal Lamp Replacement
- Underhood Electrical Center or Junction Block Replacement
- Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness)
- Control Module References for BCM replacement, setup, and programming