Steering wheel button control adapter for Audi ACV SWC 42A-1321-003-0

steering wheel adapter for Audi A2 (8Z) (11/99->07/05), A3 (8L) (08/00->06/03), A3 (8P) (07/03->05/05), A4 (B6/B7) (11/00->02/09), A6 (4B/C5) (05/01->03/06) and TT (8N) (09/98->07/06)
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Steering wheel button control adapter for Audi ACV SWC 42A-1321-003-0

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Steering Wheel Control Adapter for Audi ACV SWC 42A-1321-003-0

Retain the original steering wheel control functions when replacing the factory radio with an aftermarket unit. Depending on the vehicle's equipment, the range of functions, and the software of the newly installed radio, some functions may be limited or replaced by others. Compare the displayed wiring connectors with the connectors in your vehicle to ensure they match both technically and visually. Verify whether one of the listed OEM radios was originally installed. Before final installation, check the vehicle's functionality, system settings, and proper operation of the steering wheel controls (SWC).

Compatible Vehicles

Audi A2 (8Z) 11/1999 -> 07/2005 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.
Audi A3 (8L) 08/2000 -> 06/2003 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.
Audi A3 (8P) 07/2003 -> 05/2005 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.
Audi A4 (B6/B7) 11/2000 -> 02/2009 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.
Audi A6 (4B/C5) 05/2001 -> 03/2006 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.
Audi TT (8N) 09/1998 -> 07/2006 - original radio Blaupunkt / Matsushita / Grundig Concert II / Symphony II / Chorus II 1-DIN with two rotary controls, support for OEM amplifier 2-channel / 4-channel via RCA.

CAN Bus Information

Connectors and Power:

Connector: ISO / Mini ISO.
Support for OEM amplifier 2-channel / 4-channel – output via RCA (male) front/rear.
Blue wire: +12 V REMOTE for amplifier activation.

Settings:

Check DIP switches according to the type of aftermarket radio.

Special Notes:

If unsure about the Audi connector variant: use Audi/Seat Exeo ISO/Quadlock Amp > RCA cable.
Aftermarket units with pre-amplified output level > 3 V recommended; for outputs < 3 V use version "Audi A2/A3/A4/A6/TT ISO/Mini ISO Amp > Pro".
If amplifier shutdown noise is audible, add a noise filter – NF "ground loop isolator".

Diagnostic LED Indication:

Blue flashing: searching for CAN Bus signal.
Blue steady: CAN Bus active.
Red steady: active +12 V ignition current.

Important Additional Information

Designed for aftermarket radios from Sony, Kenwood, Panasonic, JVC, Pioneer, Blaupunkt, Clarion, Alpine, LG, Zenec, Becker.
To fully activate the adapter, a connection cable for the specific radio brand must be ordered.

General Installation Guidelines

Pre-Installation Verification:

Check all control functions and vehicle settings with the original OEM head unit.
Disconnect the original radio (OEM HU) without power.
Ensure all interface connections are correctly connected – without power.

Connection and Wiring Order:

Check the interface settings and HW configuration – without power.
Check the configuration of the connection cable to the HU – without power.
Connect the cable to the HU according to the aftermarket device instructions.
Connect other wires according to the device instructions.
Connect the entire installation to the vehicle – main power connection last.
Perform software configuration of the interface according to the product description or instructions.
Configure the aftermarket HU (e.g., steering wheel control, camera, hands-free, antenna power).
Conduct a functional test of the steering wheel control and vehicle communication.

Changing Interface and HU Cable Configuration:

Make all changes without power.
Repeat steps 5 to 8 listed above.

In Case of Interface or Vehicle System Malfunction:

Reinstall the original OEM HU.
Start the original unit.
Trigger CAN Bus system shutdown.
Check the interface HW configuration.
After CAN Bus shutdown, repeat steps 5 and 6 listed above.

For Modifications to Wiring or Cabling:

Connections and modifications must be performed by professionally trained personnel only.
All changes must be verified for manufacturer approval or impact on vehicle warranty before connection.
All modifications must be verified by measurement and comparison with vehicle wiring diagrams before connection.
Modifications are carried out at your own risk, with no guarantee of functionality.
Modifications are undertaken at your own risk, with no guarantee against vehicle, device, or interface damage.
Modifications to pre-installed cabling may result in the loss of product warranty.