2003 Volvo S80 BaseFACTORY OEM SERVICE PROCEDURE

Signals ABS Control Module With DSTC (Dynamic Stability And Traction Control)

The table below summarizes the input signals to and output signals from the ABS control module. 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: 
Stop lamp switch  (3/9)
Four Wheel sensors  (7/31, 7/32, 7/56, 7/57)
Two pressure sensors  (7/129, 7/139)
Yaw rate sensors 1 and 2  (7/127, 7/148)
Lateral acceleration sensor  (7/128)
Activation unit DSTC  (Pedal pressure sensor) (8/46)		 Activation unit DSTC  (Pressure build-up valve) (8/46)
Via Controller Area Network (CAN) communication:  Via Controller Area Network (CAN) communication: 
Central electronic module (CEM)  (4/56):
  • Provides information about the car configuration
  • Indicates that back-up gear has been selected. This is to temporarily switch off the Active Yaw Control function (manual gearboxes only).

Engine control module (ECM)  (4/46). Indicates current engine torque when calculating the DSTC control.
Climate control module (CCM)  (3/112). Provides information to manually switch off the DSTC function.
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 current gear, next gear and lock-up status (automatic transmission only).

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 being turned to the left or right
  • about the speed at which the steering wheel is being 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). Receives a request to decrease the torque during DSTC control.
Central electronic module (CEM)  (4/56):
  • Receives a request not to light the stop (brake) lamps during DSTC
  • The signal informs the other control modules that the DSTC system is active.

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.
Climate control module (CCM)  (3/112). Receives a request to light the LED indicator in the DSTC button.
Driver information module (DIM)  (5/1):
  • Vehicle speed
  • Receives a request to light the ABS and traction control warning lamp in the combined instrument panel
  • Receives a request that a text message should be displayed in the combined instrument panel.
Fig 1: DSTC System
GLL106633Courtesy of VOLVO CARS OF NORTH AMERICA.
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