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 provides an overview of each diagnostic category. |
DTC Descriptor
DTC B1480 00: Battery Rundown Protection CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
BCM Supply Voltage | B1480 00 | B1480 00 | -- | -- |
12-Volt Reference | B1480 00 | 1 | -- | -- |
Inadvertent Lamps Ground | -- | 1 | -- | -- |
1. Inadvertent Lamps Malfunction | ||||
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
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the X3 harness connector at the BCM.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
- If all circuits test normal, replace the BCM.
| ⇒ | 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 |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
