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 graphic 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: |
Stability sensor (BSC)
(7/164):
- Gives information about yaw rate, lateral acceleration, horizontal acceleration (AWD or MPS6).
|
- |
| Via Controller Area Network (CAN) communication: |
Via Controller Area Network (CAN) communication: |
Central electronic module (CEM)
(4/56):
- Gives information about the vehicle's configuration, ignition position, and if reverse gear is engaged (manual transmission), etc.
Transmission control module (TCM)
(4/28):
- Gives information about if reverse gear is engaged as well as about current gear, next gear.
- Also gives information to Brake control module (BCM) about if the gearshift lever is moved to manual shifting mode (1st gear) as well as lock-up status.
Steering wheel angle sensor module (SAS)
(4/68):
- Gives information about the steering wheel's position, turning to left or right, with what speed the steering wheel is turned as well as status of the Steering wheel angle sensor module (SAS).
Engine control module (ECM)
(4/46):
- Gives information about current engine torque, the engine's RPM, brake light switch status and accelerator pedal position. On vehicles with manual transmission, if gearshift lever is moved to 1st gear position.
Climate control module (CCM)
(4/6):
- Gives information about activation/deactivation of the function Hill Descent Control via the switch (HDC) on the tunnel console (only XC70).
Differential electronic module (DEM)
(4/82):
- Gives information about torque distribution to rear wheels and function status (only AWD).
Forward Sensing Module (FSM)
(4/80):
- Request to prepare for braking of the vehicle with the functions Adaptive cruise control and Collision warning and brake boost.
Park Brake Module (PBM)
(4/115):
- Gives information about request to brake the vehicle until the Park Brake Module can take over.
|
Driver information module (DIM)
(5/1):
- Receives information about the vehicle's speed, request for turning on lights, text message as well as activation/deactivation of DSTC function, activated via Infotainment control module (ICM) as well as the function Hill Descent Control (HDC) (only XC70).
Transmission control module (TCM)
(4/28):
- Receives a request to delay a gear shift in the event of a substantial speed difference in the front wheels
Engine control module (ECM)
(4/46):
- Receives a request about torque reduction or torque increase.
Differential electronic module (DEM)
(4/82):
- Receives information about the brake function (AWD).
Climate control module (CCM)
(4/6):
- Receives a request to turn on/off indicator in the switch for the function Hill Descent Control (HDC) (only XC70).
Phone module (PHM)
(16/60):
- Receives information about driving distance.
Infotainment control module (ICM)
(3/281):
- Receives information about the rotation speed of the front wheels. Used to measure distance
Central electronic module (CEM)
(4/56):
- Receives information about the brake function's status.
Forward Sensing Module (FSM)
(4/80):
- Receives information about if driver activates the brake, vehicle speed, vehicle's longitudinal acceleration, vehicle's yaw angle speed as well as if the vehicle oversteers or understeers.
Park Brake Module (PBM)
(4/115):
- Receives information about status of request to brake the vehicle.
|
Courtesy of VOLVO CARS CORPORATION