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VAT Pin it. Previous Product Next Product. A list of available cradles can be found at Mercupgrades. There are two Mercedes bluetooth cradles and one alternative available, but to add complexity they are very different and don't work with all cars.
The phone's aerial is used to make the call, and of course the phone is not charging so making calls uses the battery up quicker than normal as both bluetooth and the phone itself are in use together. The SAP cradle is quite clever in that it is a phone in itself, and it 'borrows' the identity of your mobile phone using a bluetooth facility called Sim Access Profile SAP.
This means that the cradle ends up using the car's external antenna instead of the antenna on the telephone in your pocket. This gives better signal strength, and prevents the battery on the phone in your pocket running down to some extend. You can also plug a SIM directly into this cradle, and it acts as a phone - this is useful in an emergency if your phone battery is dead.
Because SAP is not that well supported by vendors, the list of supported phones is relativey smal but growingl. The current list of phones that Mercedes have tested can be found in my Mercupgrades. This is an alternative to the Mercedes HFP cradle and is considerably better. It is also software upgradable unlike the Mercedes HFP product. There are two types of audio technology in the later Mercedes Benz vehicles. If your car has infra-red reflecting glass, then your only real option is the Mercedes SAP adapter as it uses the car's antenna.
The infra-red reflecting glass contains metal and considerably reduces the phone signal available inside the car, so if calls are made using the phone using bluetooth HFP the quality is often too low.
If you also purchased the phone-pre wiring, then you must either install a fixed cradle or the Bluetooth SAP cradle. Newer Mercedes vehicles have a cradle based phone integrated phone system. You plug the appropriate cradle for your phone into the car, and plug your phone into that.
Of course there are not phone cradles for all phones, and it is not just a simple audio connection involved as the integrated phone system allows you to control the phone from the sat-nav system or buttons on the steering wheel. There are also Bluetooth cradles that talk to your phone via Bluetooth, so you don't even have to clip your phone into the cradle. For some reason the systems in European and North American systems are slightly different even though they use the same wiring and connectors and are made by the same manafacturer.
The connector system is physically identical. I know of some US cradles that work in European vehicles, however the Bluetooth SAP cradles and the European 'fixed phone' cradles will not work as they contain complete phones and the frequencies used for the GSM phone network in North America are different to Europe.
You can order these cradles straight from your dealer, but there are plenty on ebay. If you use the link Ebay Cradle Search Ebay Cradle Search it will search for cradles in German as-well as the rest of English which will save you money. It does not work as the rear handset in the new W S class. It does not work with D2B based cars - i. The person at the other end of the call hers their voice echoed back with a delay.
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