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

Battery voltage is applied at all times to the body control module (BCM) from the BCM 2 fuse located in the underhood fuse block. The BCM then applies this voltage to the following lamps:

* Underhood lamp

* Front reading lamps

* Middle reading lamps

* Rear reading 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 1-2 Shift Solenoid (SS) Valve (M30)

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 X3 harness connector at the BCM.

2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the B+ circuit fuse is open, test the control circuit and components listed below for a short to ground. If all circuits and components test normal, replace the BCM.

BCM Harness Connector X2 Terminal 1

* Underhood Lamp

* Front Courtesy/Reading Lamp

* Middle Courtesy/Reading Lamp

* Rear Courtesy/Reading Lamp

* Left Sunshade Lamp

* Right Sunshade Lamp

3. If all circuits test normal, replace the BCM.

Repair Instructions

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

* Sunshade Illuminated Mirror Lamp Bulb Replacement Service and Repair

* Dome Lamp Replacement Service and Repair

* Dome Lamp Bulb Replacement Service and Repair

* Underhood Lamp Replacement Service and Repair

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