B1480

DTC B1480

DTC Descriptor
DTC B1480 00
- Battery Rundown Protection

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

Voltage is applied to the body control module (BCM) from the INT LPS fuse. The BCM then applies voltage to the following lamps:

-V4U Base Vehicle
* Instrument panel (I/P) compartment lamp
* LED interior lamps control module
* Rear compartment lamp
* Vanity mirror lamps

+V4U Limousine
* I/P compartment lamp
* Rear compartment lamp
* Vanity mirror lamps

+V4U/B9Q Hearse
* I/P compartment lamp
* Overhead console lamps
* Overhead lamp relay
* Rear compartment lamp
* Rear roof rail lamps
* 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

The ignition is ON.

Conditions for Setting the DTC

The BCM receives a ground signal on the inadvertent power courtesy lamp circuit.

Action Taken When the DTC Sets

The inadvertent power courtesy lamps do not illuminated.

Conditions for Clearing the DTC

The BCM clears this code from current when the fault is removed from the system.

Circuit/System Verification

Ignition ON, activate each inadvertent power courtesy lamp. Ignition OFF, activate each inadvertent power courtesy lamp. Lamps should 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.

Circuit/System Testing

1. Clear the DTC. Disconnect all the inadvertent power courtesy lamps related components. Refer to the circuit/system verification for all components that contain the inadvertent power courtesy lamps. Verify the DTC B1480 does not set

• If the DTC resets, then test for a short to ground in the inadvertent power courtesy lamps circuit. If the circuit/connections test normal, replace the BCM.

2. Reconnect each component one at a time and test for the DTC B1480. If the DTC resets, then replace that component.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Instrument Panel Compartment Lamp Switch Replacement
* Courtesy Lamp Replacement - Rear Quarter
* Courtesy Lamp Switch Replacement - Rear Quarter
* Vanity Mirror Lamp Replacement
* Rear Compartment Lamp Replacement
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
* Programming and Relearning for BCM setup, and programming. Programming and Relearning