Seat belt buckle switch
The belt buckle switches indicate whether the seat belts have been fastened or not. The belt buckle switches are supplied with voltage by the MRS control unit. The current consumption of the switch is the signal for the switch position (seat belt fastened or not fastened). The belt buckle switches are monitored permanently as of terminal R On.
| Item | Explanation |
|---|---|
| 1 | Seat belt buckle switch for front passenger seat belt |
| 2 | > only R56 in European version: seat belt buckle switch for rear right seat belt |
| 3 | Comb connector |
| 5 | > only R56 in European version: seat belt buckle switch for rear left seat belt |
| 5 | Belt buckle switch for driver belt |
| Body CAN | Body CAN |
| Kl. 31 | Ground connection (Terminal 31) |
| Terminal R | Terminal R |
| MRS | MRS control unit |
- Seat belt buckle switch for driver's seat belt and passenger belt. The signal from the seat belt buckle switch decides whether or not the seat belt tensioner is activated when needed.
If the front passenger seat is recognized as being occupied without the seat belt buckle switch sending a signal, a fasten belt warning will be emitted. Whether or not the belt tensioner on the passenger's side is activated depends on the status signal of the seat belt buckle switch (seat belt fastened or not fastened). If the seat belt is inserted into the seat belt buckle switch, the belt tensioner is also activated (European version: only in the event of head-on or rear-end collision; see also national-market version).