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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

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Battery Rundown Protection Circuit

Diagnostic Fault Information






Circuit/System Description

The CTSY/LAMP fuse supplies battery voltage to the body control module (BCM). The BCM applies battery voltage to the courtesy lamps through the courtesy lamp supply voltage circuit. When any door is opened, the jam switch contacts close and the BCM receives a door-open input. If the BCM receives a door lock or unlock input or a rear hatch open input, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to all of the instrument panel (I/P) courtesy lamps, rearview mirror lamps, and rear compartment lamps. The BCM also provides a class 2 serial data message to the driver door module (DDM) and passenger door module (PDM) to apply battery voltage to the exterior courtesy lamps. In the event that any of these lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position, the BCM will deactivate the courtesy lamp supply voltage circuit to prevent a total battery discharge condition.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The courtesy lamp supply voltage circuit that feeds the courtesy lamps, underhood lamp, IP compartment lamp, console lamp and both visor vanity mirror lamps is shorted to ground for longer than 1 second.

Actions Taken When the DTC Sets

The courtesy lamps, underhood lamp, I/P compartment lamp, and both visor vanity mirror lamps will not operate.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 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 5 Bow Lowered Switch (CM7)

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 Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at each component fed by the courtesy lamp supply voltage circuit.

2. Ignition ON, verify that a test lamp illuminates between the courtesy lamp supply voltage circuit at each component harness connector and ground.

If the test lamp does not illuminate, test the courtesy lamp supply voltage circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the BCM.

3. Connect each component one at a time and verify with a scan tool if the DTC resets as current.

4. If the DTC resets, replace the component.

Repair Instructions

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

* Instrument Panel Courtesy Lamp Bulb Replacement Instrument Panel Courtesy Lamp Bulb Replacement

* Instrument Panel Compartment Lamp Switch Replacement Service and Repair

* Cargo Lamp Replacement Cargo Lamp Replacement

* Inside Rearview Mirror Replacement (DD8) Inside Rearview Mirror Replacement (DD8)Inside Rearview Mirror Replacement (Except DD8) Inside Rearview Mirror Replacement (Except DD8)

* Sunshade Replacement Sunshade Replacement

* Control Module References Control Module References for BCM replacement, setup, and programming