Tuesday, January 7, 2020

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1435

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1435



Instructions)provides an overview of each diagnostic category.



DTC Descriptors



DTC P0572



- Brake Switch Circuit 1 Low Voltage



DTC P0573



- Brake Switch Circuit 1 High Voltage



Diagnostic Fault Information



Circuit/System Description



The stop lamp switch signal circuit is a B+ input from the body control module (BCM) to the engine control module (ECM). The ECM monitors



the stop lamp switch circuit to detect when the brake pedal has been applied. The BCM monitors the brake pedal position sensor to determine when



the brake pedal is applied. When the brake pedal is applied, the BCM supplies B+ on the stop lamp switch signal circuit and also sends a serial data



message to the ECM indicating that the brake pedal has been applied.



Conditions for Running the DTC



* The engine is running.



* Battery voltage is greater than 11.5 V.



Conditions for Setting the DTC



P0572



This DTC will set when the ECM detects a short to ground or an open on the discrete brake signal circuit when the serial data message from the



BCM indicates the brakes are applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal



circuit do not match for 8 out 10 times, and the condition is present for greater than 2 seconds.



P0573



This DTC will set when the ECM detects a short to voltage on the discrete brake signal circuit when the serial data message from the BCM



indicates the brakes are NOT applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit



do not match for 8 out 10 times, and the condition is present for greater than 2 seconds.



Actions Taken When the DTC Sets



* The malfunction indicator lamp (MIL) will not illuminate.



* The cruise control system is disabled.



Conditions for Clearing the DTC



* The condition responsible for setting the DTC no longer exists.



* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.



Reference Information



Schematic Reference



Cruise Control Schematics (See: Cruise Control/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Description and Operation



Cruise Control Description and Operation (See: Cruise Control/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)

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