Steering wheel button control adapter for BMW / Mercedes / Smart / VW ACV SWC 42A-1190-003-0

steering wheel adapter for BMW 1er (E81/E82/E87/E88) (03/04->10/13), 3er (E90/E91/E92/E93) (03/05->10/13), Mercedes A-class (C169/W169) (10/04->04/08, 06/08->06/12), B-class (T245) (07/05->04/08, 04/08->09/11), C-class (CL203/S203/W203) (02/04->09/07), C-class (C204/S204/W204) (08/07->01/11, 03/11->10/15), Citan 420 (W420) (10/21->24), CLC-class (CL203) (06/08->02/11), CLK-class (W209) (04/05->01/10), CLS-class (C219) (04/08->09/10), E-class (S211/W211) (03/08->01/09), E-class (A212/C212/S212/W204) (02/09->03/13), G-class (W463) (04/07->06/08), G-class (W164) (09/08->06/12), GL-class (X164) (09/06->05/09, 05/09->07/12), M-class (W164) (07/05->04/08, 10/08->07/11), ML (W164) (07/05->04/08, 10/08->07/11), R-class (W251) (09/05->05/07, 05/07->05/10), SL-class (R230) (03/06->02/08, 04/08->12/11), SLK-class (R171) (04/08->03/11), Sprinter (W906) (04/06->08/13, 08/13->05/18), Sprinter (W907/W910) (06/18->12/20, 11/19->24), Vito/Viano (W639) (07/03->08/10, 09/10->03/14), Vito (W447) (10/14->02/19, 05/19->24), Smart For Four (W454) (01/04->04/07), VW Crafter I (2EC/2EK/2F) (03/06->07/11, 07/11->11/16)
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Steering wheel button control adapter for BMW / Mercedes / Smart / VW ACV SWC 42A-1190-003-0

Retain the original steering wheel radio control functions when replacing the factory radio with an aftermarket unit. Depending on the vehicle equipment, the range of functions and the software of the newly installed head unit, some functions may be limited or replaced by others. Compare the shown wiring connectors with the connectors in your vehicle and make sure they match both technically and visually. Check whether one of the listed OEM head units was originally installed. Before final installation, verify the vehicle functionality, system settings and correct operation of the steering wheel control (SWC).

Intended for vehicles

BMW 1 Series (E81/E82/E87/E88) (03/2004 -> 10/2013) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box. Vehicles with rear PDC require adapter 42cxpdc.
BMW 3 Series (E90/E91/E92/E93) (03/2005 -> 10/2013) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box. Vehicles with rear PDC require adapter 42cxpdc.

Mercedes A‑class (C169/W169) (10/2004 -> 04/2008) - original OEM head unit.
Mercedes A‑class (C169/W169) (06/2008 -> 06/2012) - original OEM head unit.
Mercedes B‑class (T245) (07/2005 -> 04/2008) - original OEM head unit.
Mercedes B‑class (T245) (04/2008 -> 09/2011) - original OEM head unit.
Mercedes C‑class (CL203/S203/W203) (02/2004 -> 09/2007) - original OEM head unit.
Mercedes C‑class (C204/S204/W204) (08/2007 -> 01/2011) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.
Mercedes C‑class (C204/S204/W204) (03/2011 -> 10/2015) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.
Mercedes Citan 420 (W420) (10/2021 -> 2024) - original OEM head unit.
Mercedes CLC‑class (CL203) (06/2008 -> 02/2011) - original OEM head unit.
Mercedes CLK‑class (W209) (04/2005 -> 01/2010) - original OEM head unit.
Mercedes CLS‑class (C219) (04/2008 -> 09/2010) - original OEM head unit.
Mercedes E‑class (S211/W211) (03/2008 -> 01/2009) - original OEM head unit.
Mercedes E‑class (A212/C212/S212/W204) (02/2009 -> 03/2013) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.
Mercedes G‑class (W463) (04/2007 -> 06/2008) - original OEM head unit.
Mercedes G‑class (W164) (09/2008 -> 06/2012) - original OEM head unit.
Mercedes GL‑class (X164) (09/2006 -> 05/2009) - original OEM head unit.
Mercedes GL‑class (X164) (05/2009 -> 07/2012) - original OEM head unit.
Mercedes M‑class (W164) (07/2005 -> 04/2008) - original OEM head unit.
Mercedes M‑class (W164) (10/2008 -> 07/2011) - original OEM head unit.
Mercedes ML (W164) (07/2005 -> 04/2008) - original OEM head unit.
Mercedes ML (W164) (10/2008 -> 07/2011) - original OEM head unit.
Mercedes R‑class (W251) (09/2005 -> 05/2007) - original OEM head unit.
Mercedes R‑class (W251) (05/2007 -> 05/2010) - original OEM head unit.
Mercedes SL‑class (R230) (03/2006 -> 02/2008) - original OEM head unit.
Mercedes SL‑class (R230) (04/2008 -> 12/2011) - original OEM head unit.
Mercedes SLK‑class (R171) (04/2008 -> 03/2011) - original OEM head unit.
Mercedes Sprinter (W906) (04/2006 -> 08/2013) - original OEM head unit.
Mercedes Sprinter (W906) (08/2013 -> 05/2018) - original OEM head unit.
Mercedes Sprinter (W907/W910) (06/2018 -> 12/2020) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.
Mercedes Sprinter (W907/W910) (11/2019 -> 2024) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.
Mercedes Vito/Viano (W639) (07/2003 -> 08/2010) - original OEM head unit.
Mercedes Vito/Viano (W639) (09/2010 -> 03/2014) - original OEM head unit.
Mercedes Vito (W447) (10/2014 -> 02/2019) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box. Volume function only with OEM HU Audio 10.
Mercedes Vito (W447) (05/2019 -> 2024) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box. Volume function only with OEM HU Audio 10.

Smart ForFour (W454) (01/2004 -> 04/2007) - original OEM head unit. Vehicles with Comand OEM Sat Nav 40‑Pin Quadlock.

VW Crafter I (2EC/2EK/2F) (03/2006 -> 07/2011) - original OEM head unit.
VW Crafter I (2EC/2EK/2F) (07/2011 -> 11/2016) - original OEM head unit. Vehicles with permanent +12V disconnect (terminal 30) — connect to the fuse box.

CAN Bus information

Connectors and power:

Connector: 40‑pin Mercedes Quadlock (item: 42cx28).

Settings:

Check the DIP switches on the aftermarket head unit (HU).

Vehicle compatibility:

Mercedes vehicles with Audio 20 2‑DIN OEM HU.
Mercedes vehicles with Audio 50 APS Comand NTG2 / NTG2.5 OEM Sat Nav.
Mercedes Citan 420 (W420) vehicles with Browse 1‑DIN OEM HU.
Mercedes Sprinter (W907/W910) vehicles with Browse 1‑DIN OEM HU.
Mercedes Vito (W447) vehicles with Audio 10 / Audio 15 OEM HU.
Mercedes Vito (W447) vehicles with Audio 30 / Audio 40 OEM Sat Nav.
VW Crafter vehicles with RCD 3002 OEM HU.
VW Crafter vehicles with RNS 4001 / RNS 5001 OEM Sat Nav.

Diagnostic LED indication:

Blue blinking: searching for CAN Bus signal.
Blue steady: CAN Bus active.
Red steady: +12 V ignition power active.

Important additional information

Intended for aftermarket head units by Sony, Kenwood, Panasonic, JVC, Pioneer, Blaupunkt, Clarion, Alpine, LG, Zenec, Becker.
To fully activate the adapter, you must order the connecting cable for the specific head unit brand.

General installation instructions

Checks before installation:

Check all steering wheel control functions and vehicle settings with the original OEM head unit installed.
Disconnect the original radio (OEM HU) with the power off.
Check all interface connections to ensure they are correctly connected — with the power off.

Connections and wiring sequence:

Check the interface settings and hardware configuration — with the power off.
Check the configuration of the HU connection cable — with the power off.
Connect the cable to the HU according to the aftermarket device instructions.
Connect the remaining wires according to the device instructions.
Connect the entire installation to the vehicle — connect the main power last.
Perform the software configuration of the interface according to the product description or manual.
Configure the aftermarket HU (e.g. steering wheel control, camera, handsfree, antenna power).
Perform a functional test of the steering wheel control and communication with the vehicle.

Changing interface configuration and HU cable:

Make all changes with the power off.
Repeat steps 5 to 8 listed above.

If the interface or vehicle system malfunctions:

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

When modifying wiring or cable routing:

Connections and modifications must be performed only by professionally trained personnel.
All changes must be verified for manufacturer approval or impact on the vehicle warranty before connecting.
All modifications must be verified by measurement and compared with the vehicle wiring diagram before connecting.
Modifications are performed at your own risk; no guarantee of functionality is provided.
Modifications are at your own risk; no guarantee against damage to the vehicle, device or interface is provided.
Pre‑modified harnesses may result in loss of product warranty.