E64 Convertible Seat Back Locking
Because it has no B-pillars, the E64 Convertible makes use of seats with integrated 3-point seat belts in the seat backs. If the seat back is not correctly locked, there is the danger of the occupant being propelled forwards with the seat back and thus without a restraining action. This would be equivalent to the occupant not having their seat belt fastened.
Because of this, the driver and front passenger seat backs are monitored for correct locking.
The driver/front passenger seat modules use Hall sensors in the seat backs to monitor the positions of the seat backs. The information is communicated to the Crash Safety Module via the K-CAN connection. This information is used to calculate the triggering algorithm.
The effect on the triggering response of an incorrectly locked seat back would be the same as that of occupant whose seat belt was not fastened.
If the seat backs are not correctly locked, the driver/front passenger seat modules generate the following Check Control messages, which are then sent via the K-CAN to the instrument cluster and the central information display.
| Fixed indicator lamp | Variable indicator lamp | CC message | Text in central information display |
|---|---|---|---|
| Driver's seat back not locked! | Driver's seat back not locked. Increased risk of injury in a crash because seat belt ineffective! Lock seat back. |
||
| Passenger seat back not locked! | Passenger seat back not locked. Increased risk of injury in a crash because seat belt ineffective! Lock seat back. |