Signals, Brake Control Module (BCM) With Or Without STC (Stability And Traction Control) / TRACS (Traction Control System)

The table below summarizes the input signals to and output signals from the brake control module (BCM). The signal types are divided into directly connected signals, serial communication and Controller area network (CAN) communication. The following illustration displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected:	Directly connected:
Four Wheel sensors (7/31, 7/32, 7/56, 7/57) Pedal position sensor (7/124)
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56). Provides information about the car configuration. Transmission control module (TCM) (4/28). Provides information about the current gear, next gear and lock-up status (automatic transmission only). Climate control module (CCM) (3/112). Provides information that the driver has switched of the STC (Stability and traction control) function. Engine control module (ECM) (4/46): Via the central electronic module (CEM): The signal indicates if the engine is running or not, the current engine speed (RPM) and the current torque Provides information about the driver's intentions concerning acceleration or deceleration for calculating the stability control (STC only). Differential electronic module (DEM) (4/82). Provides information about the torque distribution to the rear wheels and the function status (All-wheel drive (AWD) only).	Driver information module (DIM) (5/1): Vehicle speed Receives a request about the lighting of the ABS-, brake, and traction control warning lamp in the combined instrument panel Receives a request about which text message should be displayed in the combined instrument panel. Climate control module (CCM) (3/112). Receives a request to light/turn off the indicator in the STC button. Transmission control module (TCM) (4/28): Receives a request to delay a gearshift in the event of a substantial speed difference in the front wheels Receives information about the position of the brake pedal sensor. Engine control module (ECM) (4/46): Receives a request to decrease torque during stability control Receives information about the position of the pedal. Differential electronic module (DEM) (4/82). Receives information about the brake function (AWD). Road Traffic Information Module (RTI) (16/45). Receives information about the rotation speed of the front wheels. Used to measure distance. Phone Module (PHM) (16/60). Receives information about the traveled distance, used when the Global Positioning System makes calculations.

Fig 1: Brake Control Module Input And Output Signals (1 Of 2)

Courtesy of VOLVO CARS CORPORATION