Audi A4: 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 compartment side trim panel.
Note
If replacing the control module, select the "Replace control
module" function for the corresponding control module on the
Vehicle Diagnostic Tester.
Removing
- Turn off the ignition and all electrical equipment and
remove the ignition key.
- Open the left storage compartment in the luggage
compartment.
The bracket with the Digital Sound System Control Module
-J525- must be removed first.
![A91-12477](images/books/2001/A91-12477.png)
- Release and disconnect the connectors
-1- from the Digital Sound System Control Module -J525--2-.
![A91-12478](images/books/2001/A91-12478.png)
- Insert the Fiber-Optic Repair Set - Connector Protective
Caps -VAS6223/9--1- onto the MOST
Bus connector -2-.
![A97-0760](images/books/2001/A97-0760.png)
- Remove the nuts -arrows- on the
bracket and remove the Digital Sound System Control Module
-J525--2- with the bracket.
![A91-12478](images/books/2001/A91-12478.png)
- Remove the bolts -arrows- and
remove the Digital Sound System Control Module -J525--1-
from the bracket -2-.
![A91-12479](images/books/2001/A91-12479.png)
Installing
- Install in reverse order of removal. Note the following:
Tightening Specifications
- Refer to
→ Chapter "Component Location Overview - Sound System, Speaker, Sedan"
- Refer to
→ Chapter "Component Location Overview - Sound System, Speaker, Avant"
READ NEXT:
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
The Left Front Midrange Speaker -R103-/Right Front Midrange
Speaker -R104--1- are located in
the center of the front doors.
Removing and installing is identical.
Removing
- Turn off the ignitio
Subwoofer -R211-, Removing and Installing, Sedan
The Subwoofer -R211- is located in the rear shelf.
Removing
- Turn off the ignition and all electrical equipment and
remove the ignition key.
-&n
SEE MORE:
General Information
The support mode provides the vehicle electrical system with
voltage when the Battery -A- is removed or disconnected.
For more information. Refer to the Battery Charger -VAS5903-
Operating Instructions.
The support mode is used for the following situations:
Vehicle electrical
Note
The Passenger Side Front Airbag Crash Sensor -G284- is removed
and installed the same way.
Removing
WARNING
Risk of injury due to involuntary deployment.
Pay attention to the safety precautions when working
with pyrotechnic components. Refer to
→ Chapter "Safety Precau