take a look here for CA-R-PI.131 connector

http://www.service.pioneer-eur.com/pees ... PI.131.pdf

 

 

and here for CA-R-PI.133

http://www.service.pioneer-eur.com/pees ... PI.133.pdf

 

But I need to know what one is for a 2004 Mercedes Benz C230?

 

Any help would be appreciated Thanks