getehem

Hi all, I really would appreciate your help regarding this , I am lost.... I am an european living in Asia...A friend of mine has got a GRAND VOYAGER 2012 and requested my help for installing an after market multimedia device in it. So far so good...everything works, but the steering wheel controls... My friend ( living in a remote location, we communicate only through the net....) is not able to identify the wires bringing the electrical signal from the SWC to the dashboard... I suggested him to test each unidentified wire from his connectors with a multimeter, testing while pressing different SWC....he told me that no one wire does give a 2.5V-5V signal....this seems very surprising to me! Here is a picture of his car's connectors. If you could tell me where are these (two?) wires, I would thank you one thousand times! Best regards Georges