LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2009 >> XC70 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical Modules And Components - Design And Function - 5 Of 5 >> Suspension Module (Sum) >> System Overview >> Signals
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Overview: Signals

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

Input signals Output signals
Directly connected: Directly connected:
  • Height sensor, suspension (7/118, 7/119, 7/120, 7/121):
    • measures the vertical position of the suspension, individually for each wheel.
  • Acceleration sensor, body :
    • measures the body's vertical speed change.
  • Switch :
    • driving mode or can be selected.
  • Valve deployment, shock absorber (8/20, 8/21, 8/22, 8/23):
    • solenoids in the shock absorbers.
  • Switch (3/225):
    • selected driving mode indicated.
Via Controller Area Network (CAN) communication: Via Controller Area Network (CAN) communication:
    Fig 1: Brake control module (BCM) (4/16):
    GLL175020
    • the vehicle speed
    • actual brake mode (ABS, DSTC, EBA)
    • brake pressure
    • actual and required yaw rate
    • lateral acceleration.
    • Fig 2: Engine control module (ECM) (4/46):
    GLL175104
    • required and actual engine torque
    • engine speed
    • Fig 3: Steering wheel angle sensor module (SAS) installed inside the steering wheel module (SWM) (3/130):
    GLL179272
    • steering wheel angle and steering wheel angle speed.
    • Fig 4: Central electronic module (CEM) (4/56):
    GLL175395
    • back-up gear status
    • global parameters
    • intensity of the lighting in the switch from the light switch module (LSM).
    • Fig 5: Climate control module (CCM) (4/6):
    GLL178455
    • the intensity of the lighting in the switch via the twilight sensor.
    Fig 6: Driver information module (DIM) (5/1):
    GLL174968
    • a text message indicating that Four-C (Continuously Controlled Chassis Concept) is not working.
    • Fig 7: Headlamp Control Module (HCM) (4/118) (Applies up to and incl. structure week 201119 and only vehicles with Bi-Xenon lights):
    GLL175022
    • from height sensor, used for headlamp range adjustment.
scientia non olet · About LEMON Manuals