Suzuki XL7 2007 Service Manual page 2359

Circuit/System Testing
1. Place the PRNDL in to the PARK Position.
Disconnect both tail lamp assemblies and the inside
rearview mirror. Clear the DTC. Using a test lamp
connected to ground probe the backup lamps
voltage supply circuit at the tail lamps.
➢ If the test lamp illuminates, test for a short to
ground or open in backup lamps voltage supply
circuit. If all circuits/connections test normal,
replace the BCM.
➢ If the test lamp illuminates, test for a short to
ground or an open in the CHMSL/DIMR fuse
voltage supply circuit. If all circuits/connections test
normal, replace the BCM.
DTC B2575
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• "Strategy Based Diagnosis: "
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: "
DTC Descriptor
DTC 2575 00: Headlamp Control Circuit
Diagnostic Fault Information
Circuit
Low Beam Headlamp Relay Control Circuit
1. Headlamps Inoperative - Low Beams
2. Headlamps Always On - Low or High
Circuit/System Description
Voltage is applied at all times to the low beam headlamp
relay from battery voltage. The low beam headlamp
relay is soldered to the Underhood Fuseblock. The
replacement of the relay is accomplished by replacing
the underhood fuseblock. Two different inputs to the
body control module (BCM) can turn ON the low beam
headlamps. The headlamp switch and the ambient light
sensor.
Automatic Headlamps Operation
When the ambient light sensor detects a low light
condition, the BCM then applies a ground to the
headlamp low beam relay control circuit. This engages
the headlamp relay and applies voltage through the
headlamp fuses to the low beam headlamps.
Headlamp Switch Operation
When the headlamp switch is placed in the ON position,
ground is applied to the BCM through the headlamp
switch circuit. The BCM then applies a ground to the
headlamp low beam relay control circuit. This engages
the headlamp relay and applies voltage through the
headlamp fuses to the low beam headlamps.
2. Connect one of the tail lamp assemblies and test for
the DTC. If the DTC resets replace that tail lamp
assembly.
➢ If tail lamps test normal, replace the inside rearview
mirror.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Tail Lamp Replacement"
• "Rearview Mirror Replacement: "
• "Control Module References: " for BCM replacement,
setup, and programming
Short to Open/High
Ground Resistance
2 1
Conditions for Running the DTC
The ignition is ON. The headlamps must be commanded
ON by either the BCM or by the headlamp switch.
Conditions for Setting the DTC
The BCM detects a short to voltage on the low beam
headlamps relay control circuit while trying to apply a
ground to the circuit.
Action Taken When the DTC Sets
The low beam headlamps are not illuminated.
Conditions for Clearing the DTC
The BCM clears this code from current when the fault is
removed from the system.
Lighting Systems:
Signal
Short to Voltage
Performance
B2575
9B-38
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