Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Voltage is applied to the body control module (BCM) from the Interior Lights fuse. The BCM then applies voltage to the following lamps:

In the event that any of these lamps were to remain illuminated for more the 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power courtesy lamps circuit to prevent total battery discharge.

The ignition is ON.

The BCM receives a ground signal on the inadvertent power courtesy lamp circuit.

The inadvertent power courtesy lamps do not illuminated.

The BCM clears this code from current when the fault is removed from the system.

Schematic Reference

Interior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, activate each inadvertent power courtesy lamp. Ignition OFF. Activate each inadvertent power courtesy lamp. Lamps should remain illuminated for more the 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent power courtesy lamps circuit to prevent total battery discharge.

1. Clear the DTC. Disconnect all the inadvertent power courtesy lamps related components. Refer to the circuit/system verification for all components that contain the inadvertent power courtesy lamps. Verify the DTC B1480 does not set

⇒	If the DTC resets then test for a short to ground in the inadvertent power courtesy lamps circuit. If the circuit/connections test normal replace the BCM.

2. Reconnect each component one at a time and test for the DTC B1480. If the DTC resets then replace that component.

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