2010 Cadillac Truck SRX AWD V6-3.0L Page 877

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2010 Cadillac Truck SRX AWD V6-3.0L Page 877



DTC C0890 03



- Control Module Voltage Reference Output 3 Circuit Low Voltage



DTC C0890 07



- Control Module Voltage Reference Output 3 Circuit High Voltage



Diagnostic Fault Information



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.

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