B1480

DTC B1480

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B1480 00
- Battery Rundown Protection Circuit

Diagnostic Fault Information





Circuit/System Description

Battery voltage is applied at all times to the body control module (BCM) from the INT LAMPS Fuse located in the rear fuse block. The BCM then applies this voltage to the following lamps:

* Courtesy reading lamps
* Dome lamp
* Rear compartment courtesy/cargo lamp
* Vanity mirror 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.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The BCM detects a short ground on the inadvertent power courtesy lamp circuit.

Action Taken When the DTC Sets

The BCM will deactivate the inadvertent voltage to the courtesy lamps.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once the 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Interior Lighting Systems Description and Operation (Interior Lighting Systems)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate harness connector at each component fed by the inadvertent power courtesy lamp circuit.
2. Ignition ON, with a scan tool clear the DTC.
3. Operate the system within the Conditions for Running the DTC and verify the DTC does not reset.

• If the DTC resets, test the inadvertent power courtesy lamp circuit for a short to ground. If the circuit tests normal, replace the BCM.

4. Connect each component one at a time and verify that the DTC does not reset.

• If the DTC resets, test or replace the component responsible for setting the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Dome Lamp Replacement (3 Piece Lens) (Dome Lamp Replacement (3 Piece Lens))Dome Lamp Replacement (1 Piece Lens) (Dome Lamp Replacement (1 Piece Lens))
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming