Exhaust System Sound Generator Control Unit, Component Description - GF54.21-P-0010OM

MODEL 204 as of 9/1/12 with ENGINE 651.9 with CODE P84 (Sport Edition)

Vehicle view shown from the front left on model 204.347 (as of 1.6.11)

Fig 1: Identifying Exhaust System Sound Generator Control Unit - Shown On Model 204.347

Location

The exhaust system sound generator control unit is installed behind the left luggage compartment lining in the trunk.

Task

The exhaust system sound generator control unit has the following tasks:

Actuating the speaker for exhaust system sound generator (H4/31)
Reducing the total sound level of exhaust system
Producing the desired sound pressure level

Input and output signals

The following input signals are evaluated by the exhaust system sound generator control unit and appropriate output signals are emitted:

CAN input signals
CAN output signals
Direct output signals

CAN input signals

Engine speed
Vehicle speed
Engine load
Diagnosis requests

The sound characteristics are further influenced through the following signals:

Accelerator pedal angle
Accelerator pedal gradient
Gear selection
Clutch position
Trailer operation

CAN output signals

Diagnostic data

Direct output signals

Exhaust system sound generator speaker

Body

The housing of exhaust system sound generator control unit is made of diecast aluminum and has a connector at the vehicle end (can be locked).

Function

The input factors are read in via drive train CAN (CAN C) and evaluated by the microprocessor in the exhaust system sound generator control unit. Then, the exhaust system sound generator speaker is activated.

Designation	Unit	Values	Remarks
Exhaust system sound generator control unit
Voltage supply for control unit	V	Min. 6 Max. 16	Communication active
	V	Min. 9 Max. 16	Sound active

Wiring diagram for sound generator control unit

PE54.21-P-2115-97FAA