Overview - Sound System, Basic Sound System (8RM)

The Basic Sound System consists of the following components:

• One speaker in the left and right front doors
• One speaker on the left and right side of the instrument panel
• One speaker in the left and right B-pillars
• One loud speaker in the left and right rear doors
• Information Electronics Control Module 1 -J794- in the Glove Compartment

Fig 1: 8 Speaker Circuit Diagram (8RM)

Courtesy of AUDI OF AMERICA, LLC

1. Information Electronics Control Module 1 -J794- in the Glove Compartment
2. Left Front Treble Speaker -R20- /Right Front Treble Speaker -R22- on Left and Right Sides of the Panel
3. Left Front Bass Speaker -R21- /Right Front Bass Speaker -R23- in Front Doors
4. Left Rear Treble Speaker -R14- /Right Rear Treble Speaker -R16- in the B-pillars on the left and right side
5. Left Rear Bass Speaker -R15- /Right Rear Bass Speaker -R17- in Rear Doors
6. MOST Bus

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 the connectors are disconnected: connect the Fiber-Optic Repair Set - Connector Protective Caps:VAS 6223/9  from the Fiber-Optic Repair Set:VAS 6223A  .

Fig 2: Fiber-Optic Conductor Repair Set VAS 6223A

Courtesy 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 fiber optic cables.

Fiber-optic cable repair. Refer to FIBER-OPTIC CABLES, REPAIRING .