LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 2012 >> X3 35i >> Repair and Diagnosis (Single Page) >> General Information >> OEM General Information >> Functional Descriptions - F25 - Transmission & Driveline, Exterior Lighting, Towing, Cruise Control Systems >> Cruise Control System - Functional Description >> Active cruise control with Stop & Go function (Ver.1) >> Functional networking
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Functional networking

For implementation of the Stop & Go function, a complex system network with distributed functions in other control units is necessary. Buses connect the ICM control unit with these other control units.

The following control units are networked for the overall function:

Control unit Function
DME or DDE: Engine control Implementation of the torque request "Engine on" signal
DSC: Dynamic Stability Control Driving condition
Implementation of braking intervention
SZL: Steering column switch cluster Operating lever
Steering angle
CIC: Navigation system Data from navigation system (influence on control variables)
Instrument panel: Instrument panel Diagram of the displays (ACC and Check Control messages)
CAS: Car Access System Terminal status and wake-up line
Door contact
EGS: Transmission control Driving position
AHM: Trailer module Identification of trailer towing
ACSM. Crash safety module Driver's seat occupancy (driver intends to exit)
Seat belt buckle contact (driver intends to exit)
RLS: Rain/rain/light sensor Road condition (wet)
FRM: Footwell module Activation, hazard warning flashers, door contact