2011 Volvo C70FACTORY OEM SERVICE PROCEDURE

Signals For Control Modules With DSTC

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 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)
Brake pressure sensor  , integrated into the ABS hydraulic modulator		 -
Via internal Controller Area Network (CAN) communication:  Via internal Controller Area Network (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 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 gear has been selected. This is to temporarily switch off the Active Yaw Control function (manual gearboxes only).
  • For the C70: Provides information about activation/deactivation of stability control and traction control (DSTC)

Transmission control module (TCM)  (4/28):
  • Provides information indicating that back-up gear is selected to temporarily switch off the Active Yaw Control function (automatic transmission only)
  • Provides information about the present gear, next gear and lock-up status (automatic transmission only).

Steering wheel module (SWM)  (3/254). Provides information:
  • About the position of the steering wheel to calculate the position of the car
  • About whether the steering wheel is being turned to the left or right
  • About the speed at which the steering wheel is being turned
  • Indicating whether the steering 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 present engine speed (RPM) and the present 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 (AWD only).
Driver information module (DIM)  (5/1) (2007-). Provides information about activating/deactivating the dynamic stability and traction control (DSTC) via the control for Steering wheel module (SWM).		 Driver information module (DIM)  (5/1):
  • Vehicle speed
  • Receives a request to light the ABS and brake warning lamp as well as the traction control warning lamp in the combined instrument panel
  • Receives a request about which text message should be displayed in the combined instrument panel.
  • Receives a request about which text message is to be displayed when the DSTC function is active or deactivated. (2007-).

Transmission control module (TCM)  (4/28):
  • Vehicle speed
  • Indicates whether ABS, stability or traction control is active
  • Receives a request to delay a gear shift in the event of a substantial speed difference in the front wheels
  • Receives information about the position of the pedal position sensor.

Engine control module (ECM)  (4/46):
  • Vehicle speed
  • Indicates whether ABS, stability or traction control is active
  • Receives a request to decrease torque during stability control
  • Receives information about the position of the pedal position sensor.

Infotainment control module (ICM)  (16/1):
  • Receives information about the traveled distance, used when the Global Positioning System makes calculations.
  • Receives information about the rotation speed of the front wheels. Used to measure distance

Differential electronic module (DEM)  (4/82). Receives information about the brake function (AWD only).
Fig 1: View Of Brake Control Module (BCM)
GLL158325Courtesy of VOLVO CARS CORPORATION
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