Telematics Control Unit (TCU) Circuit Diagram
INDEX REFERENCE CHART
| Index | Explanation |
|---|---|
| 1 | Dynamic Stability Control (DSC) |
| 2 | Central Information Display (CID) |
| 3 | Head unit (CIC) |
| 4 | Integrated automatic heater and A/C control (IHKA) |
| 5 | Controller (CON) |
| 6 | Fuse in the junction box |
| 7 | Microphone (passenger's side) |
| 8 | Roof function module (FZD) |
| 9 | Base plate phone snap-in adapter |
| 10 | Roof antenna |
| 11 | Emergency-call GSM antennal (back-up) |
| 12 | Telematics Control Unit (TCU) |
| 13 | Bluetooth antenna |
| 14 | Microphone (driver's side) |
| 15 | Steering column switch cluster (SZL) |
| 16 | Instrument cluster |
| 17 | SOS speaker |
| 18 | Crash safety module (ACSM) |
| 19 | Car Access System (CAS) |
| 20 | Footwell module (FRM) |
| 21 | Central gateway module (ZGM) |
MOST signals on the control unit TCU
MOST SIGNAL FUNCTIONAL CHART
| In/Out | Signal | Source/sink | Function |
|---|---|---|---|
| In | GPS signals | GPS antenna to CIC | Position data |
| In | Control signals | CIC | Phone book, connection set-up, incoming-call acceptance, terminal control, etc. |
| Out | Audio signals | CIC | Audio signals, call recipient BMW ASSIST |
| Out | Audio signals | CIC | Audio signals, call recipient mobile phone |
The TCU receives its power supply via terminal 30F. The power supply via terminal 30F is necessary for the provision of the BMW ASSIST services, including for example:
- Remote Door Unlock
- Vehicle Finder/Stolen Vehicle Recovery
- Remote Climate Control.
These services are implemented via the MOST bus. The TCU reacts to a call from the provider, placed at the customer's request. The TCU sends a signal via the MOST bus to the Car Access System (CAS). The CAS then wakes up the vehicle.