Question about Volkswagen Car Audio & Video

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Hi I am trying to get a Iphone 3GS to play through my daughters RCD 310 radio in her VW Caddy van. The van is Jan 2010 but she has only had it for 10 months. There is a Iphone connection coming up close to the gear leaver, it is connected to a box underneath which is a VW 000 051 444k interface. Before she bought the Iphone 3GS she borrowed my Ipod Touch and it seemed to work through this connection. But the Iphone 3GS will not. I contacted a supplier of retro fit interfaces, who suggested I get a device to reduce the voltage from 12v to 5v. I got the device and now she can get the 3GS to charge through this connection. I am considering buying a retro fit interface which claim to work a 3GS through the CD changer connection of the radio, but don't want to spent 50 to 60 pounds, only to discover they are no better than the existing VW interface already installed. can anyone suggest how to get the Iphone to work through the radio. Regards Jim

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  • jimannie May 21, 2011

    Hi Mark

    Many thanks for your prompt reply. I already have a small device I have bought to convert the voltage to the 5v supply, and this is enabling the Iphone to charge. But why, with this device fitted will the existing VW 000 051 444K interface unit that is already fitted in the vehicle not work?

    Regards Jim

  • jimannie May 22, 2011

    Hi Mark

    Thanks for getting back again, We have decided to go for a new interface and see if it works. Mainly on your advice, thanks. I will let you know how we get on. The other reason I have decided to go for a new Ipod interface is that I see there is a market for the secondhand VW 000 015 444K interface on eBay. What really crunched it and we decided to go for a new one was when I Googled in the VW interface No and on an old eBay page, item No 170625522118 there is a second hand VW interface for sale, on the bottom of the advert it states that this interface will not work with the newer VW RCD 310 radio.

    I have also been looking up on Youtube how to remove a RCD 310/510 from a VW and I am glad I did, as it is a little more complicated than I expected, although not impossible.

    Regards Jim

    Link to old eBay Advet



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The first generation iPod Touch and previous iPods had one pin that allowed the device to charge from 12 volts (firewire connection) and another pin to allow it to charge from USB (5 volts). Various companies used these pins to allow charging from 12 volt vehicle voltage to the firewire pin. Those manufactures did not connect anything to the apple 5 volt pin since the iPod could decide which voltage was available and use which ever was avaialble.

Unfortunately, Apple decided to not support using the 12 volt pin on newer device (yet they still use the same connector - the 12Volt pin just doesn't connect to anything inside the device (iPod or iPhone). Those device (chargers) did not have anything connected to the 5-volt pin.

If you buy the retrofit interface, it will work. They simply convert the 12 volt from the car, put it to a 5 volt regulator and route it to the 5 volt pin on the Apple connector. You should have no troubles.


Posted on May 21, 2011

  • Mark T
    Mark T May 22, 2011


    The VW unit was designed for the original iPods and the iPods must have the ability to charge with a 12V input. Apple stopped supporting the 12V input pin on all newer devices (after Aug 2009 approximately). Your device VW 000 051 444K only has 12V pin active (with no 5V pin active).

    All older devices have this problem, iHOME speaker systems and iPod docks for many car models. That is why companies started making the little adapter you were able to buy.



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