This cable has a loose wire for connecting to an ignition source in the car as their is no traditional + 12v key in ignition supply behind radio. The car has CAN bus data.
For a complete CAN bus solution with menu, speed pulse and steering controls use number 39-MB-A20-NTG1 .
Car models: The years stated refer to the model's years of manufacture, please check the item description for information about any changes there may be within these productions years.
Mercedes - CLS (W219) (2005 - 2010 )
Mercedes - E-Class (W211) (2002 - 2008 )
Mercedes - SLK-Class (R171) (2004 - 2008)