Functional description
The base plate provides the link to the telephone control unit and the wiring harness. The MOST bus connects the mobile phone control unit to the vehicle's bus system.
Communications between the Bluetooth mobile phone and the mobile phone control unit are supported by the Bluetooth aerial. Specific vehicle speakers provide the voice output.
The (rechargeable) batteries in the Bluetooth mobile phone are charged automatically. The snap in adapter assumes complete control of the charging process once the mobile phone locks into place in the adapter. The vehicle electrical system supplies a charge current through interfaces in the base plate.
The telephone control unit (except the Combox) transmits a "Cradle enable" signal to the base plate via the control line. With this signal, the voltage supply on the base plate is activated. The snap-in adapter executes the actual recharging process.
Every snap-in adapter includes an integral electronic recharging circuit individually designed for a specific mobile phone type. Because the recharging parameters (charge voltage, current limits, cycle times, etc.) are specifically designed for a particular type of Bluetooth mobile phone; a different type of mobile phone should never be used in the snap-on adapter.
The following graphic shows for instance a base plate without optional equipment.
| Item | Explanation |
|---|---|
| 1 | Cover |
| 2 | Base plate |
| 3 | Eject button |
| 4 | 18 pin plug connection |
| 5 | Aerial connector |
| 6 | Locking hook |
| 7 | 18-pin multi-pin connector and aerial connection for snap-in adapter |
The optional equipment SA6NF "Extended connectivity for mobile phone music player" expands the base plate to include a USB connection. This can be used to play audio files stored in the mobile phone while simultaneously retaining complete phone functionality.
When the interface box High (ULF-SBX-H) is installed, the base plate transfers the audio data to the telephone control unit via the AUX Out connection and an 18-pin plug connection. The base plate transfers the control signals to the telephone control unit through the USB port.
If a Combox is installed, the base plate transfers the audio data and control signals to the telephone control unit via the USB port.
The mobile phone control unit transmits the data to the head unit on the MOST bus. The tracks can either be selected on the mobile phone, via control center or with help of the multifunction steering wheel. To be able to make the selection via iDrive, a playback list is displayed in the Central Information Display.
It is possible to use the mobile phone in the snap-in adapter and the USB slot in the center console at the same time. Howver, it is not possible to access the audio data stored in the phone while a device is connected to the USB port.
The following graphic shows for instance the base plate with option SA6NF "Extended connectivity for mobile phone music player".
| Item | Explanation |
|---|---|
| 1 | Base plate |
| 2 | Eject button |
| 3 | 18 pin plug connection |
| 4 | USB connection |
| 5 | Aerial connector |
| 6 | Locking hook |
| 7 | USB port, gold-plated pin housing with shield |
| 8 | 18-pin multi-pin connector and aerial connection for snap-in adapter |
The base plate had been specifically developed to offer extended connectivity for mobile phone music players and includes two gold-plated pin housings as a distinctive feature. The standard base plate without the extended connectivity has plastic pins at the same location.
With the optional equipment SA6NR "Apps" the base plate is extended by a Colour Video Blanking Signal connection. This enables video files saved on the mobile phone (such as films, podcasts, etc.) to also be displayed on the central information display.
The base plate is connected to the headunit via the CVBS line.
The video data and image data are transmitted via CVBS signals (Colour Video Blanking Signal). The Colour Video Blanking Signal (CVBS) transmits colour and brightness components, as well as synchronization pulses, over the differential signal line (CVBS+, CVBS-).
A snap-in adapter which supports the video function can be detected on the silver eject button. In addition, the text "VIDEO READY" or "MEDIA" is located on the underside. The snap-in adapter can also be fitted with a fan to cool the end device.
The following graphic shows for instance a snap-in adapter with a video connection for smartphones.
| Item | Explanation |
|---|---|
| 1 | Snap-in adapter with silver eject button |
| 2 | Integrated fan for cooling the end device |