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DTC B1480

DTC B1480

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions has overviews of all diagnostic categories.


DTC Descriptor

DTC B1480 02

Battery Rundown Protection Circuit Short to Ground

Circuit/System Description

With the Ignition OFF, the body control module monitors the battery voltage to make sure that the voltage stays within the proper range. If the battery voltage is to low the BCM cuts several electrical circuits depending on the charging condition of the battery.

Conditions for Running the DTC

Ignition is OFF.

Conditions for Setting the DTC

The BCM detects a low battery voltage.

Action Taken When the DTC Sets

The BCM cuts several electrical circuits depending on the charging condition of the battery.

Conditions for Clearing the DTC

The condition for setting the DTC is not longer present.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for information on diagnostic tools

Circuit/System Verification


1. Run the engine and have the accessories off. Measure and register the battery voltage at the battery connections. The voltage must be between 12.6-15.0 V.

2. If not within the specified range, refer to Charging System Test .

3. Ignition OFF, measure and record the battery voltage at the battery terminals. The voltage must be between 12.45-12.75 V.

4. If not within the specified range, refer to Battery Inspection/Test .

5. Clear DTCs and verify the DTC B1480 does not reset.

6. If the DTC resets, replace the K9 Body Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)

• Control Module References for information on BCM replacement, setup, and programming