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 illustration below displays the same information with the Volvo component designations

Suspension Module (SUM) Signals

Input signals

Output signals

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 (7/87, 7/88, 7/89):

measures the body's vertical speed change.

*Switch (3/225):

driving mode "COMFORT", "SPORT" or "ADVANCED" can be selected.

Directly connected:

*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:

*Brake control module (BCM) (4/16):

the vehicle speed
actual brake mode (ABS, DSTC/ESC, EBA)
brake pressure
actual and required yaw rate
lateral acceleration.

*Engine Control Module (ECM) (4/46):

required and actual engine torque
engine speed

*Steering wheel angle sensor module (SAS) installed inside the steering wheel module (SWM) (3/130):

steering wheel angle and steering wheel angle speed.

*Central electronic module (CEM) (4/56):

back-up gear status
global parameters
intensity of the lighting in the switch from the light switch module (LSM).

*Climate Control Module (CCM) (4/6):

the intensity of the lighting in the switch via the twilight sensor.

Via Controller Area Network (CAN) communication:

*Driver information module (DIM) (5/1):

a text message indicating that Four-C (Continuously Controlled Chassis Concept) is not working.

*Headlamp Control Module (HCM) (4/118) (Applies up to and incl. structure week 201119 and only vehicles with Bi-Xenon lights):

from height sensor, used for headlamp range adjustment.

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.

Safety Warning

System Overview: Signals

Use the Manual With the Right Hardware

When to See a Mechanic

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