System Overview: Signals
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 CAN communication. The illustration below 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) (only on vehicles with adaptive cruise control). DSTC activation unit (pedal pressure sensor) (8/46) (only on vehicles with adaptive cruise control). Brake pressure sensor (internally in control module/hydraulic unit) Vacuum pressure sensor (7/160) (only on vehicles without vacuum pump) |
DSTC activation unit (pressure valve) (8/46) (only on vehicles with adaptive cruise control). |
| Via internal CAN communication: | Via internal CAN communication: |
| Body sensor cluster stability sensor (BSC) (7/164). Provides information about the yaw angle speed, lateral acceleration and, on cars with all-wheel drive (AWD), also forward acceleration. | - |
| Via CAN communication: | Via CAN communication: |
| Central electronic module (CEM)
(4/56): Provides information on vehicle configuration, ignition switch position, whether reverse gear is engaged (manual transmission), etc. Transmission control module (TCM) (4/28): Provides information on whether reverse gear is engaged, current gear, upcoming shift and lock-up status (automatic transmission only). Steering wheel angle sensor module (SAS) (3/130): Provides information on steering wheel position, turning of the wheel to the right or left, at what rate the wheel is turned and the status of the steering wheel angle sensor module (SAS). Engine control module (ECM) (4/46): Provides information on current engine torque, engine speed, brake light switch status and accelerator pedal position. Differential electronic module (DEM) (4/82). Provides information on torque distribution to the rear wheels and the function status (AWD only). Forward sensor module (FSM) (4/80): Request to prepare the vehicle for braking with the functions adaptive cruise control, collision warning and brake assist. Park brake module (PBM) (4/115): Provides information on the request to decelerate the vehicle until the park brake module can take over. |
Driver information module (DIM)
(5/1): Receives information on vehicle speed, request for illumination of lamps, text messages and engagement/disengagement of DSTC function. Transmission control module (TCM) (4/28): Receives a request for delayed shifting if front wheel speeds differ too greatly. Engine control module (ECM) (4/46): Receives a request on torque reduction. Differential electronic module (DEM) (4/82). Receives information about the brake function (AWD). Phone module (PHM) (16/60): Receives information on driving distance. Infotainment control module (ICM) (3/281): Receives information on the number of front wheel rotations. Used to measure distance. Central electronic module (CEM) (4/56): Receives information on brake function status. Forward sensing module (FSM) (4/80): Receives information on whether driver activates brake, vehicle speed, vehicle's forward acceleration, vehicle's yaw angle speed and whether vehicle is oversteered or understeered. Park brake module (PBM) (4/115): Receives information on the status of request to decelerate the vehicle. |