Basic Function Of Signal Acquisition And Actuation Module At Front - GF54.21-P-9896A

Model 167, 206, 223, 232, 254, 293, 295, 296, 297 

Model 213, 238, 257, 290 as of Model year 2021 

Overview 

This document contains information on:

• General 
• Function 

General 

Various control units, sensors, switch groups and actuators are networked with the front signal acquisition and actuation module. The front signal acquisition and actuation module is connected to the network architecture of the vehicle. It controls various functions, e.g.:

• Reading in of sensors and signals
• Evaluation of input factors
• Controlling functions
• Actuation of components
• Switching of relays
• Sending signals

The front signal acquisition and actuation module is located behind the instrument panel.

Function 

The front signal acquisition and actuation module processes the signals from various sensors and also evaluates the following:

• State of charge of on-board electrical system battery
• Fill levels for individual workshop equipment, e.g. brake fluid, washer fluid
• Control requests, e.g. for interior and exterior lighting and the windshield wiper system

The front signal acquisition and actuation module controls the following functions:

• Energy management (depending on Model)
• Exterior lights
• Interior illumination
• Windshield wiper system
• Wiper park heater
• Washer fluid hose and nozzle heating (vehicles with heated washer fluid system)
• Fanfare horns
• Anti-theft alarm system (ATA) (vehicles with anti-theft alarm system)
• Climate control (depending on Model)

To implement the individual functions, the front signal acquisition and actuation module processes, among other things, the following information:

• Terminal status of terminal 15, terminal 50
• Vehicle speed
• Operating requests
• Engine management, drivetrain status information
• Brake system status information
• Reverse gear status information
• LED headlamp control status information (vehicles with LED headlamps)
• System requirements e.g to switch on the exterior lighting or for visual feedback of central locking system
• ECO start-stop function status information (except electric vehicles)
• Driver assistance systems status information
• PRE-SAFE® status information (vehicles with PRE-SAFE® occupant protection system)
• Seat belt status information
• Central locking system status information
• Door status
• Information on a crash event
• State of charge of on-board electrical system battery
• Alternator management status information (except electric vehicles)
• 48 V on-board electrical system status information (vehicles with 48 V on-board electrical system)
• High-voltage on-board electrical system status information (hybrid vehicles, electric vehicles)
• Location information (vehicles with navigation system)
• Climate control status information (depending on Model)

Which particular information ultimately initiates corresponding system reactions is available in the relevant function descriptions and function schematics.