Audi A4 Owners & Service Manuals

Audi A4: General Information - Multifunction Steering Wheel

Audi A4 (B9) 2016-2025 Service Manual / Electrical System / Communication / Multifunction Steering Wheel / General Information - Multifunction Steering Wheel

The button is integrated in the steering wheel for easier operation of infotainment, telephone and the navigation system. On Tiptronic, rocker switches are also installed on the left and right.

The Multifunction Steering Wheel Control Module -J453- (in the right button) reads out the information and transfers them over the LIN Bus to the Steering Column Electronics Control Module -J527-. From the Steering Column Electronics Control Module -J527-, the information is transferred to the individual components via the CAN Bus (comfort) and the Data Bus On Board Diagnostic Interface -J533-.

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

Overview - Multifunction Steering Wheel

Overview - Multifunction Steering Wheel, Steering Wheel with Round Airbag

Overview - Multifunction Steering Wheel, Steering Wheel with Round Airbag

1 - Tiptronic Downshift Button on Steering Wheel -E439-

  • Removing and installing. Refer to → Chapter "Tiptronic Downshift and Upshift Button on Steering Wheel -E439-/-E438-, Removing and Installing".

2 - 3-Spoke Steering Wheel

3 - Tiptronic Upshift Button on Steering Wheel -E438-

  • Removing and installing. Refer to → Chapter "Tiptronic Downshift and Upshift Button on Steering Wheel -E439-/-E438-, Removing and Installing".

4 - Bolt

  • 1 Nm

5 - Decorative Trim

6 - Right Multifunction Buttons on Steering Wheel -E441-

  • Removing and installing. Refer to → Chapter "Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing, Steering Wheel with Round Airbag".

7 - Left Multifunction Buttons on Steering Wheel -E440-

  • Removing and installing. Refer to → Chapter "Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing, Steering Wheel with Round Airbag".

Overview - Multifunction Steering Wheel, Steering Wheel with Trapezoidal Airbag

Overview - Multifunction Steering Wheel, Steering Wheel with Trapezoidal Airbag

1 - Tiptronic Downshift Button on Steering Wheel -E439-

  • Removing and installing. Refer to → Chapter "Tiptronic Downshift and Upshift Button on Steering Wheel -E439-/-E438-, Removing and Installing".

2 - 3-Spoke Steering Wheel

3 - Tiptronic Upshift Button on Steering Wheel -E438-

  • Removing and installing. Refer to → Chapter "Tiptronic Downshift and Upshift Button on Steering Wheel -E439-/-E438-, Removing and Installing".

4 - Bolt

  • 1 Nm

5 - Right Multifunction Buttons on Steering Wheel -E441-

  • Removing and installing. Refer to → Chapter "Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing, Steering Wheel with Trapezoidal Airbag".

6 - Left Multifunction Buttons on Steering Wheel -E440-

  • Removing and installing. Refer to → Chapter "Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing, Steering Wheel with Trapezoidal Airbag".

    READ NEXT:

     Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing

    Right and Left Multifunction Buttons on Steering Wheel -E441-/-E440-, Removing and Installing, Steering Wheel with Round Airbag Special tools and workshop equipment required Trim Removal Wedge -340

     Connection for External Multimedia Devices

    Overview - Connection for External Multimedia Devices There are several External Audio Source Connection -R199- versions: USB Charging - AUX IN, UE4 AMI (Audi music interface) - USB connection (qu

     Rear Seat Entertainment System (RSE)

    Overview - Rear Seat Entertainment System The Rear Seat Entertainment System (RSE, 9WF) consists of: Left Rear Information Display Control Head Control Module -J648-/Right Rear Information Display

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     A/C Pressure/Temperature Sensor

    There are different versions of this sensor with different functions and with different names. For exact name, allocation and notes doe the respective function, refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Refrigerant Circuit; System Overview - Refrigerant C

     Refrigerant Circuit, Tracing Leaks Using Electronic Leak Detector

    Vehicles with a High Voltage System (Hybrid Vehicles) Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to → Chapter "Warnings when Working on Vehicles with High Voltage System" and → Electrical Equipment; 

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