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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 >> TV System >> Overview - TV System

Overview - TV System

The TV system (QU1) is part of the MMI Infotainment system.

The TV Tuner -R78- is connected via the MOST bus to the other Infotainment system components. Operation is performed via the Multimedia System Control Head -E380-.

GWWA91-12558Courtesy of AUDI OF AMERICA, LLC
  1. Roof Antenna -R216-
  2. Front Information Display Control Head -J685-, Display in Center of the Instrument Panel
  3. Multimedia System Control Head -E380- in the Center Console
  4. Information Electronics Control Module 1 -J794- in the Glove Compartment
  5. External Audio Source Connection -R199- in the Center Console Storage Compartment
  6. MOST Bus
  7. Digital Sound System Control Module -J525- in Luggage Compartment on Left Rear Side
  8. TV Tuner -R78- in the Right Rear of the Luggage Compartment
  9. Microphone Unit in Front Roof Module -R164- in the Front Interior Lamp -W1-

Fault Finding is performed using the "Guided Fault Finding"  on the Vehicle Diagnostic Tester.

Antenna wires, repairing. Refer to ANTENNA WIRES, REPAIRING .

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  .

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 GENERAL REPAIR INFORMATION .