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 B3445 00: Stop Lamp CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
CHMSL Voltage Supply | B3445 | 1 | 2 | -- |
1. Stop Lamps Inoperative 2. Stop Lamps Always On | ||||
Circuit/System Description
Battery voltage for the center high mounted stop lamp (CHMSL) is applied from the CHMSL/DIMR 15 amp Fuse in the I/P 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.
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, press the brake pedal. The CHMSL should illuminate.
Circuit/System Testing
- Disconnect the CHMSL assembly. Clear the DTC. Using a test lamp connected to the positive battery terminal, probe the CHMSL voltage supply circuit.
- Replace the CHMSL assembly.
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
