2010 Cadillac Truck SRX AWD V6-3.0L Page 564
DTC B2500
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 B2500 00
- Driver Exterior Unlock Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The driver window switch monitors the voltage level of the key switch unlock signal circuit. When the key is inserted into the driver door key
cylinder and turned to the Unlock position, a switch within the driver door latch closes causing the voltage to drop within the key switch unlock
signal circuit. The driver window switch will detect the drop in voltage and will send a serial data message to the BCM commanding all the doors
to unlock.
Conditions for Running the DTC
* The ignition is ON.
* The system voltage is 9-16 V.
Conditions for Setting the DTC
The BCM detects a short to ground on the driver door key switch signal circuit.
Action Taken When the DTC Sets
The BCM will ignore the unlock command from the key cylinder switch.
Conditions for Clearing the DTC
* This DTC will be current for as long as the fault is present
* When the fault is no longer present, the DTC will be a history DTC
* A history DTC will clear after 50 ignition cycles
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Power Door Locks Description and Operation (See: Body and Frame/Locks/Power Locks/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
