B3445

DTC B3445

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Strategy Based Diagnosis
- Diagnostic Procedure Instructions

DTC DESCRIPTOR

DTC B3445 00

Stop Lamp Circuit




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
Battery voltage for the center high mounted stop lamp (CHMSL) is applied from the CHMSL/Back-up Fuse in the rear electrical center to the body control module (BCM). When the brake pedal is applied, a signal is applied to the BCM. The BCM then applies a voltage to the CHMSL voltage supply circuit to the CHMSL.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON. The stop lamps must be commanded ON.

CONDITIONS FOR SETTING THE DTC
The BCM receives a ground signal on the CHMSL voltage supply circuit when the stop lamps are being commanded ON.

ACTION TAKEN WHEN THE DTC SETS
The CHMSL does not illuminate.

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, press the brake pedal. The CHMSL should illuminate.

Circuit/System Testing
1. Disconnect the CHMSL assembly. Clear the DTC. Using a test lamp connected to the positive battery terminal, probe the CHMSL voltage supply circuit.
- If the test lamp illuminates, test for a short to ground in the CHMSL voltage supply circuit. If all circuits/connections test normal, replace the BCM.
2. Replace the CHMSL assembly.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- High Mounted Stop Lamp Replacement
- Control Module References for BCM replacement, setup, and programming Programming and Relearning