Basic Function Of Signal Acquisition And Actuation Module - GF54.21-S-9895A

Model All (Light transporter) 

Courtesy of MERCEDES-BENZ USA

Example illustration of signal acquisition and actuation module 

Overview 

This document contains information on:

• General 
• Function 
  • Controlling of functions 

General 

Depending on the vehicle, the signal acquisition and actuation module (1) is located in the driver's or front passenger's footwell.

The signal acquisition and actuation module (1) is connected to the network architecture of the vehicle. Various control units, sensors, switch groups and actuators are networked with the signal acquisition and actuation module.

Function 

The signal acquisition and actuation module (1) combines the controls of various functions under one housing. The individual controls evaluate the input information, actuate corresponding actuators and perform functions.

Depending on the equipment involved, the following controls may be positioned under the housing of the signal acquisition and actuation module (1):

• Climate control
• Camera cover control for camera in rear end (vehicles with parking system)
• Anti-theft alarm system (ATA) (vehicles with anti-theft alarm system)

Controlling of functions 

The signal acquisition and actuation module (1) processes the signals from various sensors and evaluates the following, among other things:

• 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 signal acquisition and actuation module (1) controls the following functions:

• Energy management
• Exterior lighting
• Interior lighting
• Rear window heater
• Central locking system of tailgate or rear-end door and fuel filler flap or socket flap
• Windshield wiper system
• Washer fluid hose and nozzle heating (vehicles with heated washer fluid system)
• Horns
• Tire pressure monitoring system (depending on the model, the tire pressure monitoring system function is integrated into the signal acquisition and actuation module, e.g. on model 420)

To implement these functions, the signal acquisition and actuation module (1) processes, among other things, the following information:

• Terminal status of terminal 15, terminal 50
• Vehicle speed
• Operating requests
• Tire pressure (depending on model, e.g. on model 420)
• 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 for electric vehicles)
• Driver assistance systems status information
• PRE-SAFE® status information (vehicles with PRE-SAFE® occupant protection system)
• Seat belt status information
• Information on a crash event
• State of charge of on-board electrical system battery
• Alternator management status information (except for electric vehicles)
• High-voltage on-board electrical system status information (electric vehicles)
• Seat adjustment status information (vehicles with electrical seat adjustment)
• Location information (vehicles with navigation system)

	Wiring diagrams
	Overview of wiring diagrams for electrical system, equipment and instruments	Model 420	PE54.00-S-1100VRA
	Component descriptions
	Signal acquisition and actuation module, component description	Model 420	GF54.21-S-0029A
		Model 447 with code XM7 (MOPF II)	GF54.21-S-0029B