Steering wheel button control adapter for Mercedes / Smart / VW ACV SWC 42XMC002-0

Steering wheel button control adapter for Mercedes, Smart and VW ACV SWC 42XMC002-0

Maintain the original radio control functions from the steering wheel when replacing the factory radio with an aftermarket unit. Depending on vehicle equipment, 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 and ensure they match both technically and visually. Check whether any of the listed OEM head units were originally installed. Before final installation verify vehicle functionality, system settings and correct operation of the steering wheel control (SWC).

Intended for vehicles

• Mercedes A-class (C169/W169) (10/2004 -> 04/2008)
• Mercedes A-class (C169/W169) (06/2008 -> 06/2012)
• Mercedes B-class (T245) (07/2005 -> 04/2008)
• Mercedes B-class (T245) (04/2008 -> 09/2011)
• Mercedes C-class (CL203/S203/W203) (02/2004 -> 09/2007)
• Mercedes Sprinter (W906) (04/2006 -> 08/2013)
• Mercedes Sprinter (W906) (08/2013 -> 05/2018)
• Mercedes Vito/Viano (W639) (04/2006 -> 08/2010)
• Mercedes Vito/Viano (W639) (09/2010 -> 03/2014)

• Smart ForFour (W454) (01/2004 -> 04/2007)

• VW Crafter I (2EC/2EK/2F) (03/2006 -> 07/2011)
• VW Crafter I (2EC/2EK/2F) (07/2011 -> 11/2016)

CAN Bus information

Connectors and power:

• Connector: ISO – vehicles with CAN Bus in the ISO power connector.
• For unknown Mercedes connector variant: SWC Mercedes vehicles ISO/40Pin Quadlock Multilead (item: 42xmc00c).

Compatibility and limitations:

• Mercedes vehicles with 1-DIN Audio 5 Audio OEM HU.
• Smart vehicles with 1-DIN OEM CD HU.
• VW vehicles with 1-DIN RCD2001 OEM HU.
• Vehicles with an open dashboard – before installation check the CAN Bus connection and ISO connector wiring by measurement; incorrect wiring will damage the adapter.
• Vehicles without ISO connector wiring: Pin 7 = +12V ignition (terminal 15), Pin 6 = +12V illumination (terminal 58).
• Vehicles with different interior comfort CAN wiring: brown-red twisted pair -> blue twisted pair = CAN High, brown twisted pair -> white twisted pair = CAN Low, CAN Bus located in the splitter under the sill cover or at the climate control.
• Reverse +12V signal is not always supported – alternatively use the white/blue wire on the driver side.

Signals and output load capacity:

• Red: +12 V ignition power (Terminal 15).
• Orange: +12 V illumination (Terminal 58).
• Purple/white: +12 V reverse signal.
• Green: GND parking brake signal.
• Total max. output load: 100 mA. For higher current use relays – 1 relay with coil resistance min. 75 Ω, 2 relays with coil resistances min. 150 Ω.

Important additional information

• Steering wheel control (SWC) via CAN Bus. Re-imported vehicles or vehicles with different software may experience function incompatibilities.
• To fully activate the adapter, it is necessary to order the connecting cable for the specific radio brand.

General installation instructions

Checks before installation:

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

Connection and wiring sequence:

1. Check the interface settings and hardware configuration – with power off.
2. Check the configuration of the radio connection cable – with power off.
3. Connect the cable to the radio according to the aftermarket device manual.
4. Connect the remaining wires according to the device manual.
5. Connect the entire installation to the vehicle – connect the main power last.
6. Perform the software configuration of the interface according to the product description or manual.
7. Configure the aftermarket HU (steering wheel control, camera, handsfree, antenna power and others).
8. Perform a functional test of the steering wheel control and communication with the vehicle.

Changing the interface configuration and HU cable:

• Make all changes with power off.
• After changes 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 a CAN Bus system 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:

• Wiring and modifications may only be carried out by appropriately trained personnel.
• All changes must be verified before connection with regard to manufacturer approval or impact on the vehicle warranty.
• All modifications must be verified by measurement and comparison with the vehicle wiring diagram before connection.
• Modifications are performed at your own risk, without guarantee of functionality.
• Modifications are performed at your own risk, without guarantee against damage to the vehicle, device or interface.
• Pre-modified cabling may result in loss of product warranty.

Product comments

Evaluation

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