Audi S4 S5 SQ5 MMI 3G GPS Navigation Multimedia Main Unit - Genuine OEM 8T2035754A

Replace a faulty or damaged factory infotainment computer with this Genuine OEM Audi MMI 3G Navigation Main Unit, part number 8T2035754A.

Also identified as the J794 information-electronics control module, this unit manages compatible factory navigation, radio, audio, media, telephone and vehicle-menu functions through the Audi MMI system.

Product Features

• Genuine OEM Audi infotainment component
• Audi part number 8T2035754A
• Alternative part-number format 8T2 035 754 A
• MMI 3G GPS navigation and multimedia main unit
• J794 information-electronics control module
• Diagnostic control-module address 5F
• Designed for selected right-hand-drive applications
• Compatible factory navigation and multimedia management
• Suitable for selected Audi S4, S5 and Q5-platform vehicles
• Original factory connectors and mounting design

Common Symptoms of a Faulty MMI Unit

• MMI system does not start
• System repeatedly restarts or shuts down
• Navigation remains unavailable or fails to load
• Display remains blank despite receiving power
• CD, DVD or SD media is not recognised
• Radio, audio or multimedia functions operate intermittently
• Bluetooth or telephone functions are unavailable
• No communication with control module 5F
• Infotainment-related diagnostic fault codes are stored

Vehicle Compatibility

This unit may be suitable for selected right-hand-drive Audi S4, S5, Q5 and SQ5 vehicles equipped with a compatible factory MMI 3G navigation system.

Part number 8T2035754A is directly catalogued in selected Audi A5, S5 and Q5 applications. Compatibility with a particular S4 or SQ5 should be confirmed by comparing the original unit or checking the vehicle identification number.

Compatibility depends on the vehicle production date, market region, MMI version, display, amplifier, sound system, telephone preparation, navigation specification, software version and factory equipment.

Please compare part number 8T2035754A, the hardware number, software information, electrical connectors and all additional label details with the original unit before purchasing.

Similar-looking MMI units may contain different regional software, navigation configurations or enabled equipment and should not be considered interchangeable solely because the connectors appear identical.

Coding and Programming Requirements

Component-protection removal, coding and vehicle-specific commissioning are normally required when installing this MMI main unit into a different vehicle.

The replacement J794 control module may require coding, adaptation, parameterisation, component-protection removal and navigation recovery activation using Audi-compatible diagnostic equipment with authorised online access.

The unit must be configured to match the vehicle's MMI display, amplifier, sound system, telephone equipment, parking system, reversing camera and other installed factory options.

Navigation maps, activation status, software version and regional compatibility should also be checked. A used unit from another vehicle should not be considered plug-and-play.

If the vehicle's original unit is professionally repaired and reinstalled into the same vehicle, additional component-protection removal is not normally required.

Retrofit Requirements

Installing this unit into a vehicle that was not originally equipped with MMI 3G navigation may require additional compatible components.

• Compatible MMI display screen
• Centre-console MMI control panel
• GPS antenna and antenna wiring
• Power and communication wiring
• MOST fibre-optic network connections
• Compatible amplifier or audio equipment
• Dashboard trim and mounting components
• Vehicle-specific coding and system activation

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 MMI main unit is responsible for the fault. The display, control panel, antennas, power supply, wiring, amplifier and MOST fibre-optic network should also be inspected.

Where possible, the original unit should remain available during installation so its coding and adaptation information can be retrieved or transferred.

After installation and commissioning, the navigation, radio, audio, media, telephone, Bluetooth, display and vehicle-menu functions should be tested for correct operation.