Audi A4: Overview - Sound System
The following systems are offered:
- 8RM - Basic sound system.
- 9VD - Standard sound system.
- 9VS - Premium sound system, Bang & Olufsen.
8RM - Basic Sound System
- One speaker in the left and right front doors
- One speaker on the left and right side of the instrument panel
- Two speakers in the left and right rear doors
1 - Information Electronics Control Module 1 -J794- in the Glove Compartment
2 - Left Front Treble Speaker -R20-/Right Front Treble Speaker -R22- in Left and Right of the Instrument Panel
3 - Left Front Bass Speaker -R21-/Right Front Bass Speaker -R23- in the Lower Front Doors
4 - Left Rear Treble Speaker -R14-/Right Rear Treble Speaker -R16- at the Top in Rear Doors
5 - Left Rear Bass Speaker -R15-/Right Rear Bass Speaker -R17- at Bottom in the Rear Doors
6 - MOST Bus
9VD - Standard Sound System
- 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 instrument panel center
- Two speakers in the left and right rear doors
- Subwoofer -R211-
1 - Information Electronics Control Module 1 -J794- in the Glove Compartment
2 - Left Front Treble Speaker -R20-/Right Front Treble Speaker -R22- in Left and Right of the Instrument Panel
3 - Left Front Bass Speaker -R21-/Right Front Bass Speaker -R23- in the Lower Front Doors
4 - Left Rear Treble Speaker -R14-/Right Rear Treble Speaker -R16- at the Top in Rear Doors
5 - Left Rear Bass Speaker -R15-/Right Rear Bass Speaker -R17- at Bottom in the Rear Doors
6 - Center Speaker -R208- in the Instrument Panel Center
7 - Subwoofer -R11- in the Rear Shelf/Luggage Compartment
8 - MOST Bus
9VS - Premium Sound System, Bang & Olufsen
- Two speakers in the left and right A-pillars
- Two speakers in the left and right front doors
- One speaker on the left and right side of the instrument panel
- Two speakers in the center of the instrument panel
- Two speakers in the left and right rear doors
- Two speakers in the rear shelf/left and right D-pillar
- Subwoofer -R211-
- Digital Sound System Control Module -J525- in the luggage compartment on the left rear side
1 - Left Front Treble Speaker 2 -R220- in the Upper A-Pillar
2 - Left Front Midrange Speaker 2 -R276- in the Instrument Panel on the Left Side
3 - Left Front Bass Speaker -R21- in the Bottom of the Front Door
4 - Left Front Midrange Speaker -R103- in the Bottom Center of the Door
5 - Left Front Treble Speaker -R20- in the Upper A-Pillar
6 - Left Rear Treble Speaker -R14- in the Rear Door at Top
7 - Left Rear Bass Speaker -R15- in Bottom of the Rear Door
8 - Left Effects Speaker -R209- in the Rear Shelf/Left D-Pillar
9 - Center Speaker -R208- in the Instrument Panel Center
10 - Center Speaker 2 -R219- in the Center of the Instrument Panel
11 - Antenna -R11- in the Rear Shelf/Luggage Compartment
12 - Right Effects Speaker -R210- in the Rear Shelf/Right D-Pillar
13 - Right Rear Bass Speaker -R17- in the Bottom of the Rear Door
14 - Right Rear Treble Speaker -R16- in the Rear Door at Top
15 - Right Front Treble Speaker -R22- in the Upper A-Pillar
16 - Right Front Midrange Speaker -R104- in Center of the Front Door
17 - Right Front Bass Speaker -R23- in the Bottom of the Front Door
18 - Right Front Midrange Speaker 2 -R277- in the Right Instrument Panel
19 - Right Front Treble Speaker 2 -R221- in Upper A-Pillar
20 - Interior Microphone -R74-, Microphone Unit in Front Roof Module -R164- in the Front Interior Lamp -W1-
21 - Digital Sound System Control Module -J525- in Luggage Compartment on Left Rear Side
22 - MOST Bus
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 fiber optic cables.
Repairing fiber-optic cables. Refer to → Chapter "General Repair Information".
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Component Location Overview - Sound System
Component Location Overview - Sound System, Speaker, Sedan
1 - Left Front Treble Speaker -R20-/Right Front Treble Speaker -R22-,
8RM, 9VD
- Left Front Midrange Speaker 2
Control Module/Digital Sound System Amplifier, Removing and Installing
Special tools and workshop equipment required
Fiber-Optic Repair Set - Connector Protective Caps
-VAS6223/9-.
The Digital Sound System Control Module -J525--1-
is located behind the left luggage
Left and Right Rear Treble Speaker -R14-/-R16-, Removing and Installing
The Left Rear Treble Speaker -R14-/Right Rear Treble Speaker
-R16--1- are inside the rear doors
at the top.
Removing and installing is identical.
Removing
- Turn off the ignition and all electr
SEE MORE:
When driving
Starting to drive, stopping, and parking
Starting from a stop
Press and hold the brake pedal.
Start the engine.
Select "D" or "R".
Release the parking brake.
Release the brake pedal. The vehicle may roll.
Press the accelerator pedal to accelerate.
Securing the vehicle against rolling
Secure
Vehicles with Coil Springs, Checking the Curb Weight Position for Axle
Alignment
The curb weight position must be checked before beginning an
axle alignment on vehicles with coil springs. Explanation of the
curb weight position.
Determine the Dimension -a-
- Determine dimension -a- between
the center of the wheel and the lower edge of the fender/wheel
housing as shown.
