Suzuki XL7 2007 Service Manual page 2370

9B-49 Lighting Systems:
DTC B3445
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptor
DTC B3445 00: Stop Lamp Circuit
Diagnostic Fault Information
Circuit
CHMSL Voltage Supply
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.
Short to Open/High
Ground Resistance
B3445 1
Reference Information
Schematic Reference
"Exterior Lights Schematics"
Connector End View Reference
"Lighting Systems Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
• "Scan Tool Output Controls - Lighting"
• "Scan Tool Data List - Lighting"
• "Scan Tool Data Definitions - Lighting"
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 - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "High Mount Stop Lamp Replacement"
• "Control Module References: " for BCM replacement,
setup, and programming
Signal
Short to Voltage
Performance
2 —