Speaker Output Function - GF82.62-P-4212FH
Model 238
Up To Model Year 2021
Shown On Model 238 (except 238.361/461)
Show on model 238.361/461
Function requirements for speaker output, general
- Circuit 30t ON
- Transport mode not active
Speaker output, general
The speaker system is actuated by one of the following components:
- Head unit (except model 238.361/461, except code 810 (Sound system), except code 811 (Advanced Sound System) and except code B63 (Sporty engine sound))
- Engine sound control unit (with code B63 (Sporty engine sound) and except code 810 (Sound system) and except code 811 (Advanced sound system))
- Midline sound system amplifier control unit (model 238.361/461 except code 810 (Sound system) and except code 811 (Advanced Sound System))
- Sound system amplifier control unit (with code 810 (Sound system))
- Advanced Sound System amplifier control unit (with CODE 811 (Advanced Sound System))
A distinction is made between the following procedures:
- Speaker output in vehicles With Code 811 (Advanced sound system)
- Speaker output in vehicles with CODE 810 (Sound system)
- Speaker output on model 238 (except 238.361/461) except code 810 (Sound system) and except code 811 (Advanced Sound System)
- Speaker output on model 238.361/461 except code 810 (Sound system) and except code 811 (Advanced Sound System)
Speaker actuation by the HERMES control unit (N112/9) and instrument cluster (A1) are described elsewhere.
Speaker output in vehicles With Code 811 (Advanced sound system)
The audio signals from the head unit or TV tuner control unit (with code 865 (TV tuner)) are routed via MOST to the Advanced Sound System amplifier control unit, where they are finally amplified and output via the speakers using direct lines.
The head unit sends different variables for audio playback via MOST to the Advanced Sound System amplifier control unit, such as volume and tone settings or signals for speed-dependent volume control (SDV [GAL]) including interference recording.
On vehicles with code B63 (Sporty engine sound) or on model 238.361/461, the Advanced Sound System amplifier control unit receives control signals (e.g. engine speed, engine load and vehicle speed) from the ME-SFI control unit via the drive CAN, superimposes the derived synthesized sound signals on the signals from the audio source, and outputs the composite signals through the speakers.
The Advanced Sound System amplifier control unit emits the audio signals at the following speakers:
- Left front footwell woofer
- Right front footwell woofer
- Left front door sound system tweeter
- Right front door sound system tweeter
- Left side paneling sound system tweeter
- Right side paneling 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 side paneling sound system midrange speaker
- Right side paneling sound system midrange speaker
- Left front door midrange speaker
- Right front door midrange speaker
- Left rear shelf surround sound system tweeter
- Left rear shelf surround sound system midrange speaker
- Right rear shelf surround sound system tweeter
- Right rear shelf 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.
Model 238
up to model year 2021
with code 360 (HERMES UMTS)
Model 238
up to model year 2021
with code 362 (HERMES communications module LTE)
In telematics services with voice connection (e.g. emergency call), the center instrument panel midrange speaker is used for voice output and actuated via direct lines by the HERMES control unit.
Speaker output in vehicles with CODE 810 (Sound system)
The audio signals from the head unit, tuner unit (with code 522 (Audio 20 radio) and with code 536 (SIRIUS satellite radio), with code 537 (Digital radio (DAB))) or from the TV tuner control unit (with code 865 (TV tuner)) are routed via MOST to the sound system amplifier control unit, where they are finally amplified and output via direct lines through the speakers.
The head unit sends different variables for audio playback via MOST to the sound system amplifier control unit such as volume and tone settings and signals for speed-dependent volume control (SDV [GAL]) including interference recording.
On vehicles with code B63 (Sporty engine sound) or on model 238.361/461, the sound system amplifier control unit receives control signals (e.g. engine speed, engine load and vehicle speed) from the ME-SFI control unit via the drive CAN, superimposes the derived synthesized sound signals on the signals from the audio source and outputs the composite signals through the speakers.
The sound system amplifier control unit emits the audio signals at the following speakers:
- Left front door midrange speaker
- Right front door midrange speaker
- Left side paneling midrange speaker
- Right side paneling midrange speaker
- Center instrument panel speaker
- Left front door tweeter
- Right front door tweeter
- Left side paneling tweeter
- Right side paneling tweeter
- Left front footwell woofer
- Right front footwell woofer
- Left rear surround sound system midrange speaker
- Right rear surround sound system midrange speaker
Model 238
up to model year 2021
with code 360 (HERMES UMTS)
Model 238
up to model year 2021
with code 362 (HERMES communications module LTE)
In telematics services with voice connection (e.g. emergency call), the center instrument panel speaker is used for voice output and actuated via direct lines by the HERMES control unit.
Speaker output on model 238 (except 238.361/461) except code 810 (Sound system) and except code 811 (Advanced Sound System)
On vehicles except code B63 (Sporty engine sound), the audio signals are output by the head unit via direct lines over the following speakers:
- Left front door midrange speaker
- Right front door midrange speaker
- Left side paneling midrange speaker
- Right side paneling midrange speaker
- Left front door tweeter
- Right front door tweeter
- Left front footwell bass speaker (right-hand drive vehicles)
- Right front footwell bass speaker (left-hand drive vehicles)
Model 238
up to model year 2021
with code 360 (HERMES UMTS)
Model 238
up to model year 2021
with code 362 (HERMES communications module LTE)
The center instrument panel speaker is also installed and is actuated by the HERMES control unit.
On vehicles with code B63 (Sporty engine sound), the audio signals are forwarded by the head unit to the engine sound control unit. The engine sound control unit receives control signals (e.g. engine speed, engine load and vehicle speed) via the drive train CAN from the ME-SFI [ME] control unit and derives synthesized sound signals from them. The engine sound control unit places the synthesized sound signals over the input signals of the head unit and sends the composite signals to the following speakers:
- Left front door midrange speaker
- Right front door midrange speaker
- Left side paneling midrange speaker
- Right side paneling midrange speaker
- Left front door tweeter
- Right front door tweeter
- Left front footwell bass speaker (right-hand drive vehicles)
- Right front footwell bass speaker (left-hand drive vehicles)
Speaker output on model 238.361/461 except code 810 (Sound system) and except code 811 (Advanced Sound System)
The audio signals from the head unit or TV tuner control unit (with code 865 (TV tuner)) are routed over MOST to the Midline sound system amplifier control unit, where they are finally amplified and output through the speakers using direct lines.
The head unit sends different variables for audio playback via MOST to the Midline sound system amplifier control unit, e.g. volume and tone settings and signals for speed-dependent volume control (SDV) including interference recording.
The Midline sound system amplifier control unit receives control signals (e.g. engine speed, engine load and vehicle speed) from the ME-SFI control unit via the drive CAN, superimposes the derived synthesized sound signals on the signals from the audio source and outputs the composite signals through the speakers.
The Midline sound system amplifier control unit issues the audio signals at the following speakers:
- Left front door midrange speaker
- Right front door midrange speaker
- Left side paneling midrange speaker
- Right side paneling midrange speaker
- Center instrument panel speaker
- Left front door tweeter
- Right front door tweeter
- Left front footwell woofer
- Right front footwell woofer
Model 238.361/461
up to model year 2021
with code 362 (HERMES communications module LTE)
In telematics services with voice connection (e.g. emergency call), the center instrument panel speaker is used for voice output and actuated via direct lines by the HERMES control unit.
| Electrical function schematic for speaker system | Model 238 (except 238.361/461) up to model year 2021 | PE82.62-P-2300-97DCA | |
| Model 238.361/461 up to model year 2021 | PE82.62-P-2300-97DCB | ||
| Overview of system components, telematics | GF82.85-P-9999FH |