Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Overview - Infotainment System, MMI Navigation, I8S
On the "MMI Navigation" Infotainment system, the following functions are integrated in the Information Electronics Control Module 1 -J794- :
- Information Electronics Control Module 1 -J794- with integrated CD player/SD memory card reader/navigation system in the glove compartment, 7UF
- Multimedia System Control Head -E380- in the center console, UJ0
- Front Information Display Control Head -J685-, 7 inch display, in the center of the instrument panel
- External Audio Source Connection -R199- in the center console storage compartment, USB charging, AUX IN, UE4
- Sound systems: Audi sound system/Premium Sound System Bang & Olufsen, 9VD/9VS
- Digital Sound System Control Module -J525- on the left rear side of the luggage compartment, 9VS only
- Radio -R- integrated in the Information Electronics Control Module 1 -J794-, I8S
- Video input for rearview camera system, KA2
- Bluetooth Hands-Free Calling, 9ZX
- Voice recognition system, QH1
Optional
- Digital Radio -R147- integrated in the Information Electronics Control Module 1 -J794-, only Europe/Rest of World and QV3
- Radio System, Satellite -R146- integrated in the Information Electronics Control Module 1 -J794-, only USA and QV3
- External Audio Source Connection -R199- in center console storage compartment, USB (quantity: 2), AUX IN, ASI, UI2/UE7
- Instrument Cluster Control Module -J285-, color display in the instrument cluster, 9S7
- Audi phone box, 9ZE
- Audi phone box/Audi connect, 9ZE/EL3
- Emergency call system, IW3/IW5
- Multifunction Steering Wheel
ASI - Audi Smartphone Interface
- Roof Antenna -R216-
- Rear Window Antenna with Antenna Amplifier
- Front Information Display Control Head -J685-, Display in Center of the Instrument Panel
- Multimedia System Control Head -E380- in the Center Console
- CAN Bus
- Information Electronics Control Module 1 -J794- in the Glove Compartment
- External Audio Source Connection -R199- in the Center Console Storage Compartment
- MOST Bus
- Digital Sound System Control Module -J525- In Luggage Compartment on Left Rear Side
- Bumper Antennas
- Microphone Unit In Front Roof Module -R164- in the Front Interior Lamp -W1-
The MOST bus performs the system data exchange in the CAN bus and MMI.
Fault Finding is performed using the "Guided Fault Finding" on the Vehicle Diagnostic Tester.
Notes on MOST Bus
The optical data bus "MOST bus" is used in addition to the CAN bus.
A fiber-optic cable is used. Fiber optic cables are routed inside corrugated tubes for protection.
Replace the complete fiber-optic cable if possible.
The front surface of the connectors must not be contaminated.
If disconnecting the connectors: Attach the Fiber-Optic Repair Set - Connector Protective Caps: VAS6223/9 .
When routing fiber-optic cables, make sure not to go below the minimum bending radius of 25 mm. Do not crush or kink the fiber-optic cables.
Repairing fiber-optic cables. Refer to GENERAL REPAIR INFORMATION .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.