Audi A6 A7 C7 Bose Surround Sound Amplifier - Genuine OEM 4G5035223B

Replace a faulty, damaged or non-responsive factory audio amplifier with this Genuine OEM Audi Bose Surround Sound Amplifier, part number 4G5035223B.

This digital sound-system control module receives audio information from the compatible factory MMI system and distributes amplified sound to the vehicle's Bose speakers.

Product Features

• Genuine OEM Audi and Bose audio component
• Audi part number 4G5035223B
• Alternative part number format 4G5 035 223 B
• Associated Bose reference 627781-0040
• Factory Bose surround-sound amplifier
• Digital sound-system control module J525
• Designed for vehicles with factory Bose equipment code 8RY
• Compatible with selected Audi 4G-platform vehicles
• Original factory electrical and fibre-optic connections
• Replacement for a compatible faulty or damaged amplifier

Common Symptoms of a Faulty Amplifier

• No sound from the vehicle speakers
• Audio operates intermittently
• Crackling, popping or distorted sound
• Sound is missing from one or more speakers
• MMI audio functions remain muted or unavailable
• No communication with the digital sound-system module
• Sound-system diagnostic fault codes are stored
• Amplifier shows signs of moisture or corrosion damage

Vehicle Compatibility

This amplifier may be suitable for selected Audi A6, A6 Allroad and A7 4G or C7 vehicles equipped with the compatible factory Bose surround-sound system.

Selected Audi S6, S7, RS6 and RS7 applications may also use this part depending on the production date and factory audio equipment.

Compatibility depends on the vehicle production year, body style, MMI generation, speaker arrangement, factory equipment codes, hardware number and software version.

Please compare part number 4G5035223B, equipment code 8RY, the electrical connectors, fibre-optic connection and all additional label information with the original amplifier before purchasing.

This amplifier is not intended as a direct replacement for the standard Audi Sound System or Bang and Olufsen amplifier. Similar-looking sound modules may use different software, speaker outputs and system configurations.

Coding and Programming Requirements

Component-protection removal, coding and vehicle-specific configuration are normally required when installing this amplifier into a different vehicle.

A replacement amplifier may operate with restricted or unavailable audio functions until component protection has been removed and the module has been correctly commissioned.

The amplifier may require coding, parameterisation and software configuration to match the vehicle's MMI system, body style, speaker arrangement and factory Bose equipment.

A used amplifier from another vehicle should not be considered plug-and-play. If the original amplifier is professionally repaired and reinstalled into the same vehicle, additional component-protection removal is not normally required.

Installation Information

Professional installation by an Audi technician or experienced automotive infotainment specialist is strongly recommended.

The vehicle should be diagnostically scanned before replacement to confirm that the amplifier is responsible for the fault. The power supply, earth connections, speakers, wiring, MMI system and MOST fibre-optic network should also be inspected.

The amplifier installation area should be checked for water entry, moisture and corrosion before the replacement unit is installed.

After installation and programming, the complete sound system should be tested to confirm correct speaker output, balance, fade, surround-sound operation and communication with the factory MMI system.