Engine Sound, Function - GF82.60-P-0019FR

Model 257 (except 257.361) 

up to model year 2021 

with code B63 (Engine sound via speakers) 

Model 257.361, 290 with engine 256 

up to model year 2021 

Courtesy of MERCEDES-BENZ USA

Function requirements, engine sound, general 

• Engine running.

The engine sound noises are always emitted through the speakers in the vehicle, irrespective of whether the head unit is switched on or off.

Engine sound, general 

Due to the progress made in vehicle insulation, the engine and exhaust sound in the vehicle interior can no longer be optimally perceived, which in turn can limit the driving experience. To optimize the engine and exhaust noise in the vehicle interior, the sound range in the vehicle interior is supplemented by simulated sound components via the speaker system.

The engine sound function is divided into the following subfunctions:

• Function sequence for engine sound, model 257 (except 257.361) except code 810 (Sound system) and except code 811 (Advanced Sound System) 
• Function sequence for engine sound, model 257.361, model 290 except code 810 (Sound system) and except code 811 (Advanced Sound System) 
• Function sequence for engine sound with code 810 (Sound system) 
• Function sequence for engine sound with code 811 (Advanced Sound System) 

Function sequence for engine sound, model 257 (except 257.361) except code 810 (Sound system) and except code 811 (Advanced Sound System) 

The engine sound control unit receives the following signals:

• Control signals (e.g. engine speed, engine load and vehicle speed) over the drive train CAN from the ME-SFI [ME] control unit (gasoline engine) or CDI control unit (diesel engine)
• Analog signals via direct line from the head unit
• CAN signals via the telematics CAN from the head unit to secure subnetwork operation

The engine sound control unit places synthesized sound signals over the input signals of the head unit and sends the composite signals via direct lines to the following speakers:

• Left front door midrange speaker
• Right front door midrange speaker
• Left rear door midrange speaker
• Right rear door midrange speaker
• Left front door tweeter
• Right front door tweeter
• Left front footwell woofer (for right-hand drive vehicles)
• Right front footwell woofer (for left-hand drive vehicles)

Function sequence for engine sound, model 257.361, model 290 except code 810 (Sound system) and except code 811 (Advanced Sound System) 

The Midline sound system amplifier control unit receives the following signals:

• Control signals (e.g. engine speed, engine load and vehicle speed) over the drive train CAN from the ME-SFI [ME] control unit (gasoline engine) or CDI control unit (diesel engine)

The Midline sound system amplifier control unit forwards the synthesized sound signals to the following speakers:

• Left front door midrange speaker
• Right front door midrange speaker
• Left rear door midrange speaker
• Right rear door midrange speaker
• Center instrument panel speaker
• Left front door tweeter
• Right front door tweeter
• Left front footwell woofer
• Right front footwell woofer

The Midline sound system amplifier control unit software distributes the synthesized sound signals to the individual speakers.

Function sequence for engine sound with code 810 (Sound system) 

The sound system amplifier control unit receives the following signals:

• Control signals (e.g. engine speed, engine load and vehicle speed) over the drive train CAN from the ME-SFI [ME] control unit (gasoline engine) or CDI control unit (diesel engine)

The sound system amplifier control unit forwards the synthesized sound signals to the following speakers:

• Left front door midrange speaker
• Right front door midrange speaker
• Left rear door midrange speaker
• Right rear door midrange speaker
• Center instrument panel speaker
• Left front door tweeter
• Right front door tweeter
• Left rear door tweeter
• Right rear door tweeter
• Left front footwell woofer
• Right front footwell woofer
• Left rear surround sound system midrange speaker
• Right rear surround sound system midrange speaker
• Rear bass speaker (model 290)

The sound system amplifier control unit software distributes the synthesized sound signals to the individual speakers.

Function sequence for engine sound with code 811 (Advanced Sound System) 

The Advanced Sound System amplifier control unit receives the following signals:

• Control signals (e.g. engine speed, engine load and vehicle speed) over the drive train CAN from the ME-SFI [ME] control unit or CDI control unit (diesel engine)

The Advanced Sound System amplifier control unit forwards the synthesized sound signals to the following speakers:

• Left front footwell woofer
• Right front footwell woofer
• Left front door sound system tweeter
• Right front door sound system tweeter
• Left rear door sound system tweeter
• Right rear door sound system tweeter
• Left front door sound system woofer/midrange speaker
• Right front door sound system woofer/midrange speaker
• Center instrument panel tweeter
• Center instrument panel midrange speaker
• Left rear door sound system midrange speaker
• Right rear door sound system midrange speaker
• Left front door midrange speaker
• Right front door midrange speaker
• Left rear surround sound system tweeter
• Left rear surround sound system midrange speaker
• Right rear surround sound system tweeter
• Right rear surround sound system midrange speaker
• Left front center overhead control panel midrange speaker (3D sound)
• Right front center overhead control panel midrange speaker (3D sound)
• Left center rear center midrange speaker (3D sound)
• Right center rear center midrange speaker (3D sound)
• Center midrange speaker at left center (3D sound)
• Center midrange speaker at right center (3D sound)

The signals for the rear woofer are sent by the Advanced Sound System amplifier control unit to the rear woofer amplifier, which outputs the finally amplified signals via the speaker.

The Advanced Sound System amplifier control unit software distributes the synthesized sound signals to the individual speakers.

	Electrical function schematic for speaker system	Model 257 (except 257.361) up to model year 2021 with code B63 (Engine sound via speakers)	PE82.62-P-2300-97XBA
		Model 257.361, 290 with engine 256 up to model year 2021	PE82.62-P-2300-97XBB
	Overview of system components, telematics		GF82.85-P-9999FR