2010 Cadillac CTS Sedan AWD V6-3.6L Page 505
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Door Lamp Replacement (See: Lighting and Horns/Courtesy Lamp/Service and Repair/Door Lamp Replacement)
* Door Courtesy Lamp and Reflector Replacement (See: Lighting and Horns/Courtesy Lamp/Service and Repair/Door Courtesy Lamp and
Reflector Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B2575
DTC B2575
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B2575 00
- Headlamp Low Beam Control Circuit
Diagnostic Fault Information
Circuit/System Description
When the turn signal/multifunction switch is placed in the headlamp position, ground is applied to the body control module (BCM) through the
headlamp low beam signal circuit. The BCM then applies ground to the headlamp low beam relay control circuit which energizes the low beam
relay. With the low beam relay energized, the switch contacts close allowing battery voltage to flow through the LOW BEAM fuses to the low
beam headlamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Headlamps ON.
Conditions for Setting the DTC
The BCM detects a short to voltage in the headlamp low beam relay control circuit.
Actions Taken When the DTC Sets
The low beam headlamps will not operate.
