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Home >> Volvo >> 2000 >> S80 Base >> Repair and Diagnosis >> Electrical >> Body Electrical >> Control Modules - Design And Function - 3 Of 3 >> Suspension Module (Sum) (2004) >> System overview >> Signals
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System overview: Signals

The table below summarizes the input signals to and output signals from the suspension module (SUM). The signal types are divided into directly connected signals and CAN communication. The illustration below displays the same information with the Volvo component designations.

Input signals Output signals
Directly connected:  Directly connected: 
Acceleration sensor, suspension  (7/118, 7/119):
  • measures the speed of the vertical change of the front suspension.

Position sensor, suspension  (7/120, 7/121):
  • measures the vertical position of the rear suspension.

Acceleration sensor, body  (7/87, 7/88 7/89):
  • measures the speed of vertical change of the body.

Keypad  (3/225) (R-line):
  • for R-line, the "COMFORT", "SPORT" or "ADVANCED" driving modes can be selected.
 Valve deployment, shock absorber  (8/20, 8/21, 8/22, 8/23):
  • power supply to the solenoids.

Keypad  (3/225) (R-line):
  • for R line, the selected driving mode is indicated.
Via Controller Area Network (CAN) communication:  Via Controller Area Network (CAN) communication: 
Brake control module (BCM)  (4/16):
  • the vehicle speed
  • brake mode (ABS, DSTC, EBA)
  • brake pressure
  • actual and nominal yaw rate.

Engine control module (ECM)  (4/46):
  • engine running
  • desired engine torque
  • actual engine torque.

Steering Wheel Angle Sensor Module (SAS)  (4/68):
  • the position and speed of the steering wheel.

Central electronic module (CEM)  (4/56):
  • back-up gear
  • global parameters.

Climate Control Module (CCM)  (3/112):
  • the intensity of the keypad lighting via the twilight sensor (R line)
  • the signal from the switch (not R line).

Light Switch Module (LSM)  (3/111):
  • the intensity of the keypad lighting via a rheostat.
 Driver information module (DIM)  (5/1):
  • a text message indicating that Four-C (Continuously Controlled Chassis Concept) is not working.

Engine control module (ECM)  (4/46):
  • selected driving mode.

Transmission Control Module (TCM)  (4/28):
  • selected driving mode.

Central electronic module (CEM)  (4/56):
  • from the rear position sensor, used for headlamp range adjustment for GDL lamps.
Fig 1: Identifying Input/Output Suspension Module (SUM) Signals
GLL118983Courtesy of VOLVO CARS OF NORTH AMERICA.
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