Steering wheel button control adapter for Mercedes ACV SWC 42XMC008

Steering wheel button control adapter for Mercedes ACV SWC 42XMC008

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 radio, some functions may be limited or replaced by others. Compare the displayed 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 vehicle functionality, system settings and correct operation of the steering wheel control (SWC).

Designed 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 CLK-class (W209) (04/2005 -> 01/2010)
• Mercedes GL-class (X164) (09/2006 -> 05/2009)
• Mercedes GL-class (X164) (05/2009 -> 07/2012)
• Mercedes M-class (W164) (07/2005 -> 04/2008)
• Mercedes M-class (W164) (10/2008 -> 07/2011)
• Mercedes ML (W164) (07/2005 -> 04/2008)
• Mercedes ML (W164) (10/2008 -> 07/2011)
• Mercedes R-class (W251) (09/2005 -> 05/2007)
• Mercedes R-class (W251) (05/2007 -> 05/2010)

CAN Bus information

Connectors and power:

• Connector: 40 Pin Quadlock Mercedes.
• Connector: OEM amplifier system MOST25 > RCA (male) red/white.

Compatibility and limitations:

• Vehicles with 2-DIN Audio 20 OEM head unit (HU).
• Vehicles with 2-DIN Audio 50 APS Comand NTG2 / NTG2.5 OEM Sat Nav – time setting is not supported; if possible, recode the vehicle to Audio 20 OEM HU.
• Vehicles with MOST25 OEM amplifier system – CD changer / TV tuner / telephone modules must be removed from the MOST ring (optical connector MOST-ring item: 771000-2100, optical loop (f) MOST-ring item: 771000-2001).
• Vehicles without Audio 10 OEM HU, without Comand 2.0 / 2.5 OEM Sat Nav and without D2B OEM amplifier system.
• In some cases, depending on the OEM system and the aftermarket radio, increased noise or audible sounds may occur when switching on or off.

Signals and output load capacity:

• Red: +12 V ignition power (Klemme 15).
• Orange: +12 V illumination (Klemme 58).
• Purple/white: +12 V reverse signal.
• Pink: speed signal (speed pulse).
• Green: GND signal for parking brake.
• Max. output load: 250 mA. For currents above 250 mA use a relay – 1 relay with coil resistance min. 75 Ω, 2 relays with coil resistances min. 150 Ω.

Important additional information

• MOST25 OEM amplifier system – fader function is not supported.
• To fully activate the adapter, you must order the connection cable for the specific radio brand.

General installation instructions

Checks before installation:

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

Connections 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 other wires according to the device manual.
5. Connect the entire installation to the vehicle – connect the main power connection last.
6. Perform 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 controls and communication with the vehicle.

Changing the interface configuration and HU cable:

• Make all changes with the power off.
• After changes, repeat steps 5 to 8 listed above.

If the interface or vehicle system fails:

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

When modifying wiring or cable harnesses:

• Wiring and modifications may only be performed by professionally trained personnel.
• All changes must be verified before connection regarding approval by the manufacturer or impact on the vehicle warranty.
• All modifications must be verified by measurement and compared with the vehicle wiring diagram before connection.
• Modifications are made at your own risk, without guarantee of functionality.
• Modifications are carried out at your own risk, without guarantee against possible damage to the vehicle, device or interface.
• Modifying pre-fitted harnesses may result in loss of the product warranty.

Product comments

Evaluation

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• Mounting material and ACV reduction