2010 Cadillac CTS Sedan AWD V6-3.6L Page 767
Circuit/System Description
North America
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 (BCM) 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 right and left stop lamp control circuits, transmission control module (TCM), engine control module
(ECM), and center high mounted stop lamp (CHMSL) control circuit.
European
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 (BCM) 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 stop lamp relay coil side control circuit, transmission control module (TCM), engine control module (ECM),
and center high mounted stop lamp (CHMSL). When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the
stop lamp relay switch contacts close applying battery voltage from the STOP LAMPS fuse to illuminate the rear stop lamps and trailer stop lamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Brakes APPLIED.
Conditions for Setting the DTC
DTC C0277 06 will set for the following conditions:
* 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.
DTC C0277 07 will set for the following conditions:
* 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.
