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 02
- Battery Rundown Protection Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies battery voltage to the front and rear reading lamps, left and right sunshade lamps, center console compartment lamp, and instrument panel compartment lamp via the courtesy lamp control circuit. When the instrument panel compartment, center console armrest, or a sunshade mirror is opened, the switch contacts close allowing battery voltage to flow illuminating the respective lamps. The front and rear reading lamps are controlled by individual switches that are activated by the occupants when additional cabin lighting is required. In the event that any of these courtesy lamps were to remain illuminated for more than 10 minutes with the ignition switch in the OFF position and no doors opened, the BCM will deactivate the courtesy lamp control circuit to prevent total battery discharge.
Conditions for Running the DTC
Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
The BCM detects a short to ground in the courtesy lamps control circuit.
Actions Taken When the DTC Sets
The BCM will disable the circuit and all lamps controlled by the courtesy lamps control circuit will be inoperative.
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
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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, exterior lamps OFF, disconnect the harness connectors at the components listed below.
* E27 instrument panel compartment lamp
* E28 center console compartment lamp
* E3L sunshade mirror lamp - left
* E3R sunshade mirror lamp - right
* E37LF dome/reading lamps - left front
* E37RF dome/reading lamps - right front
* E37LR dome/reading lamps - left rear
* E37RR dome/reading lamps - right rear
2. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
* E27 instrument panel compartment lamp - terminal 1
* E28 center console compartment lamp - terminal 1
* E31LF sunshade mirror lamp - left terminal A
* E31RF sunshade mirror lamp - right terminal A
* E37LF dome/reading lamps - left front terminal 1
* E37RF dome/reading lamps - right front terminal 1
* E37LR dome/reading lamps - left rear terminal 1
* E37RR dome/reading lamps - right rear terminal 1
3. Verify the test lamp turns ON and OFF when commanding the Inadvertent Load ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the X7 harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit terminal and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
4. Test or replace the appropriate courtesy lamp.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Instrument Panel Compartment Lamp Replacement Service and Repair
* Sunshade Illuminated Mirror Lamp Lens Replacement Sunshade Illuminated Mirror Lamp Lens Replacement
* Front Floor Console Compartment Lamp Replacement Service and Repair
* Roof Rail Rear Seat Position Reading and Courtesy Lamp Replacement Roof Rail Rear Seat Position Reading and Courtesy Lamp Replacement
* Control Module References Control Module References for BCM replacement, programming, and setup