Signals, Brake Control Modules (BCM) With DSTC (Dynamic Stability And Traction Control)

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) Activation unit DSTC (Pedal pressure sensor) (8/46) Two pressure sensors (7/129, 7/139)	Activation unit DSTC (Pressure build-up valve) (8/46)
Via internal Controller Area Network (CAN) communication:	Via internal Controller Area Network (CAN) communication:
Sensor module DSTC (7/164). Provides information about the yaw angle speed, lateral acceleration and, on cars with All-wheel drive (AWD), also forward acceleration.
Via Controller Area Network (CAN) communication:	Via Controller Area Network (CAN) communication:
Central electronic module (CEM) (4/56). Provides information about the car configuration Provides information indicating that back-up (reverse) gear has been selected. This is to temporarily switch off the Active Yaw Control function (manual gearboxes only). Transmission control module (TCM) (4/28). Provides information indicating that back-up (reverse) gear is selected to temporarily switch off the Active Yaw Control function (automatic transmission only) 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 traction control function. Steering wheel angle sensor module (SAS) (4/68). Provides information: about the position of the steering wheel to calculate the position of the car about whether the steering wheel is turned to the left or right about the speed at which the steering wheel is turned about the status of the steering wheel angle sensor module (SAS) about whether the steering wheel angle signal is OK. 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 Indicates current engine torque when calculating the traction control. 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 to light 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 DSTC button. Transmission control module (TCM) (5/1): 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 pedal. Engine control module (ECM) (4/46): Receives a request to decrease the 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). Phone Module (PHM) (16/60). Receives information about the traveled distance, used when the Global Positioning System makes calculations. Road Traffic Information Module (RTI) (16/45). Receives information about the rotation speed of the front wheels. Used to measure distance.

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

Courtesy of VOLVO CARS CORPORATION