E60, E61, E63, E64, E87, E90: ULF Control Unit
Installation location
E60: The ULF control unit is installed in the luggage compartment on the left-hand wheel arch.
E61, E87: The ULF control unit is installed on the right-hand side of the vehicle in the luggage compartment floor.
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Body | 2 | ULF control unit |
E63, E64: The ULF control unit is installed on the left-hand side of the vehicle behind the rear seat backrest.
E90: The illustration shows the location of various control units. The ULF control unit is installed on the luggage compartment floor. Other control units may be fitted, depending on the vehicle's equipment.
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Video module | 2 | Aerial compensator |
| 3 | Digital tuner (DAB) | 4 | Control unit for universal charger and hands-free facility (ULF) |
| 5 | CD changer | 6 | Audio amplifier |
Construction
The ULF control unit comprises the components illustrated in the following block diagram:
| Key | Explanation | Key | Explanation |
|---|---|---|---|
| 1 | Bluetooth antenna | 2 | Bluetooth module |
| 3 | Digital Sound Processor, audio interface, input/output for hands-free mode | 4 | MOST bus (Media-Oriented System Transport) |
| 5 | MOST interface | 6 | Data memory (FLASH) |
| 7 | Working memory (Synchronous Dynamic Random Access Memory, SDRAM) | 8 | Fault memory (Electrically Erasable Programmable Read-Only Memory, EEPROM) |
| 9 | Microprocessor | 10 | On-board supply voltage, from CAS (Car Access System) via terminal 30g active |
| 11 | Terminal 31, earth | 12 | Power supply |
| 13 | Voltage monitoring |
The connection of the ULF control unit to the vehicle electrical system is made via a 54-pin connector. The ULF is connected to the vehicle's bus system via the MOST bus.
Pin assignment, 54-pin multi-pin connector
| Pin | Type | Description |
|---|---|---|
| 1 | E | Positive terminal for microphone 1 |
| 2 | E | Positive terminal for microphone 2 (with voice recognition system, SVS) |
| 3 | --- | --- |
| 4 | --- | --- |
| 5 | --- | --- |
| 6 | --- | --- |
| 7 | --- | --- |
| 8 | --- | --- |
| 9 | --- | --- |
| 10 | --- | --- |
| 11 | A | Switch-on signal for battery charger in snap-in adapter |
| 12 | --- | --- |
| 13 | --- | --- |
| 14 | --- | --- |
| 15 | --- | --- |
| 16 | --- | --- |
| 17 | V | Terminal 30g: power supply, active (run-on time / cutoff by CAS, Car Access System) |
| 18 | --- | --- |
| 19 | E | Negative terminal for microphone 1 |
| 20 | E | Negative terminal for microphone 2 (with voice recognition system, SVS) |
| 21 | E | Screening for microphone wire |
| 22 | --- | --- |
| 23 | --- | --- |
| 24 | --- | --- |
| 25 | --- | --- |
| 26 | --- | --- |
| 27 | --- | --- |
| 28 | --- | --- |
| 29 | --- | --- |
| 30 | --- | --- |
| 31 | --- | --- |
| 32 | E | Switch signal from hands-free button, hands-free mode on |
| 33 | --- | --- |
| 34 | A | Switch-on signal for compensator (optional) |
| 35 | --- | --- |
| 36 | M | Terminal 31, earth |
| 37 | --- | --- |
| 38 | --- | --- |
| 39 | M | --- |
| 40 | --- | --- |
| 41 | --- | --- |
| 42 | --- | --- |
| 43 | --- | --- |
| 44 | --- | --- |
| 45 | --- | --- |
| 46 | --- | --- |
| 47 | --- | --- |
| 48 | --- | --- |
| 49 | --- | --- |
| 50 | --- | --- |
| 51 | --- | --- |
| 52 | --- | --- |
| 53 | --- | --- |
| 54 | --- | --- |
| A = Output | ||
| E = Input | ||
| E/A = Input and output | ||
| M = Earth | ||
| V = Supply | ||
| For current specifications regarding pin assignment, please refer to BMW diagnosis system | ||
How it works
The ULF is connected to the vehicle's bus system. Voltage is fed to the ULF via terminal 30g, which is activated by the CAS (Car Access System). The ULF control unit controls the hands-free system and the recharging of the bluetooth mobile phone battery.
Bluetooth module The bluetooth module forms the interface between the bluetooth-compatible mobile phone and the telephone functions in the vehicle. An aerial cable connects the bluetooth module to the bluetooth antenna. Information is transmitted between the equipment with bluetooth interface and the vehicle via the bluetooth connection complying with the bluetooth radio standard. Inside the bluetooth module, transmission profiles are defined for:
- Make call in hands-free mode
- Entries in telephone directory
- Authentication
These profiles must also be stored in the bluetooth mobile phone to ensure that all functions of the "universal charging and hands-free system" (ULF) can be used.
Audio interface In hands-free mode, the audio interface uses the digital sound processor to control the feeding and output of voice information. In hands-free mode, voice information is input through the hands-free microphone. The hands-free microphone is also used by the voice recognition system (SVS).
Voice information is output via the audio system. Voice information from the hands-free microphone is fed in the form of low-frequency signals. The low-frequency signals are digitalized for further processing. Voice information fed to the loudspeakers is converted back from this digital form to low-frequency signals.
Basic voice recognition system
With the basic voice recognition system (SVS), only telephone functions can be controlled using voice recognition. The voice commands entered are not acknowledged on the CID (Central Information Display) or radio. The following telephone functions can be controlled with voice commands:
- Enter phone number
- Correct entry
- Read out entry
- Confirm entry
- Dial phone number
- Store name
- Select name
- Delete name
- Read out telephone directory
- Select telephone directory entry during reading
- Delete telephone directory
- Help
- Cancel
MOST interface The interface for the MOST bus (Media-Oriented System Transport Bus) controls the transmission and reception during data exchange on the MOST bus.
Voltage monitoring Voltage monitoring controls the recharging of the battery in the bluetooth mobile phone. If there is insufficient voltage in the vehicle electrical system, the voltage monitoring switches the onboard power supply off.