2010 Cadillac Truck SRX AWD V6-3.0L Page 801
Circuit/System Description
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an
analog voltage signal that will increase as the brake pedal is applied. The body control module provides a low reference signal and a 5 V reference
voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM
will apply battery voltage to the stop lamp control circuit and center high mounted stop lamp control circuit. When the control circuit is energized
the stop lamps are illuminated.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V
* Brakes applied
Conditions for Setting the DTC
C0277 06 or C0890 03
* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor signal circuit.
* The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor 5 V reference circuit.
C0277 07 or C0890 07
* The BCM detects a short to battery voltage in the brake pedal position sensor signal circuit.
* The BCM detects an open/high resistance in the brake pedal position sensor low reference circuit.
C0277 09
The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.
C0277 4B
The brake pedal position sensor home position is not learned.
Action Taken When the DTC Sets
Brake lights will malfunction, the shift lock is inoperative, the service park brake system lamp illuminated in IPC, park brake will set but not
disengage
Conditions for Clearing the DTC
* The 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.
Diagnostic Aids
C0277 4B
If the DTC is set, recalibrate the brake pedal position sensor.
C0277 09
If the DTC is set, replace the brake pedal position sensor. If the DTC resets, replace the BCM.
Reference Information
Schematic Reference
Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)
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
