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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Accessories & Equipment >> Warning Systems >> Communication (1 Of 2) >> 91 Communication >> Infotainment System >> Overview - Infotainment System >> Overview - Infotainment System, MMI Navigation Plus, I8H

Overview - Infotainment System, MMI Navigation Plus, I8H

On the "MMI Navigation plus" Infotainment system, the following functions are integrated in the Information Electronics Control Module 1 -J794- :

Optional

ASI - Audi Smartphone Integration

GWWA91-12555Courtesy of AUDI OF AMERICA, LLC
  1. Roof Antenna -R216-
  2. Rear Window Antenna with Antenna Amplifier
  3. Front Information Display Control Head -J685-, display in center of the instrument panel
  4. Multimedia System Control Head -E380- in the Center Console
  5. CAN Bus
  6. Information Electronics Control Module 1 -J794- in the Glove Compartment
  7. Telephone Baseplate -R126- /External Audio Source Connection -R199- in the Center Console Storage Compartment
  8. MOST Bus
  9. Bumper Antennas
  10. Digital Sound System Control Module -J525- in luggage compartment on left rear side
  11. TV Tuner -R78- in the right rear of the luggage compartment
  12. 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: VAS 6223/9  .

Fig 1: Fiber-Optic Conductor Repair Set VAS 6223A
GWWW00-11495Courtesy of AUDI OF AMERICA, LLC

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 FIBER-OPTIC CABLES, REPAIRING .