Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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).
Transmission control module (TCM) (4/28).
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:
Engine control module (ECM) (4/46):
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):
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):
Engine control module (ECM) (4/46):
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. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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