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.

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HOMESERVICE MANUALSAUDI2004A8REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTSTEERING COLUMN SWITCHESCOMMUNICATION91 - COMMUNICATIONRADIO SYSTEM - EUROPEDIGITAL SOUND SYSTEM CONTROL MODULE J525 BANG AND OLUFSEN, REMOVING AND INSTALLING

2004 Audi A8

Digital Sound System Control Module J525 BANG and OLUFSEN, removing and installing

2004 Audi A8SECTION Digital Sound System Control Module J525 BANG and OLUFSEN, removing and installing

CAUTION:

This section refers to components of the communication systems available in Europe and not all apply to communication systems used in USA and Canada.

Special tools, testers and auxiliary items required

Fig 1: Fiber Optic Plier Repair Set VAS 6223

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fiber Optic Plier Repair Set VAS 6223
Protective Cap For Cable Connector VAS 6223/9

CAUTION:

Switch off all electrical components.
Switch off ignition and remove ignition key.

Removing

Open left luggage compartment storage bin.

Digital Sound System Control Module J525 is threaded to bracket only at front.

Fig 2: Disconnecting Electrical Connection On Digital Sound System Control Module J525

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical connection - 2 - on Digital Sound System Control Module J525 - 1 -.
Remove bolts - arrows - (3 Nm).
Pull out Digital Sound System Control Module J525 - 1 - at bracket.

Fig 3: Disconnecting Electrical Connections And On Digital Sound System Control Module J525

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Now disconnect electrical connections - 1 - and - 2 - on Digital Sound System Control Module J525 - 3 -.

Fig 4: Fiber-Optic Cable Harness Connector And Protective Cap For Cable Connector VAS 6223/9

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fit the Protective Cap For Cable Connector VAS 6223/9 - 1 - on to the MOST-Bus connector - 2 -.

Installing

Install in reverse order.

Fig 5: Digital Sound System Control Module J525 Engages Correctly Into Retaining Springs

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Make sure that Digital Sound System Control Module J525 engages correctly into retaining springs - arrows - on rear bracket.

RENDER: 1.0x

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.