MRS control unit
The MRS control unit is bolted in a central position in the vehicle onto the gearbox tunnel. All inflator assemblies and sensors are connected directly to the MRS control unit. The MRS control unit evaluates the data from the sensors. In the event of a collision, the MRS control unit decides whether it is required to trigger the various restraint systems and which ignition circuits have to be triggered.
Two acceleration sensors are fitted in the MRS control unit. The longitudinal acceleration sensor detects frontal or rear-end collisions. The lateral acceleration sensor acceleration sensor detects a side impact.
An ignition capacitor is fitted in the MRS control unit. If the voltage supply is interrupted in a collision, the ignition capacitor serves as an energy reserve for the MRS control unit.
| Item | Explanation |
|---|---|
| 1 | Left knee airbag (US version) |
| 2 | Airbag front sensor, driver's side (US version) |
| 3 | Telematics Control Unit (TCU) |
| 4 | Footwell module (FRM) |
| 5 | Instrument panel (KOMBI) |
| 6 | Car access system (CAS) |
| 7 | Junction Box Electronics (JBE) |
| 8 | Switch for front passenger airbag deactivation (European version) |
| 9 | Airbag front sensor, front passenger side (US version) |
| 10 | Right knee airbag (US version) |
| 11 | Front door airbag sensor on front passenger side (US version) |
| 12 | Front passenger airbag |
| 13 | Side airbag, right |
| 14 | Airbag sensor, B-pillar, passenger's side |
| 15 | Front passenger seat occupancy detector (Europe version) |
| 16 | Front passenger seat occupancy detector (US version) |
| 17 | Belt tensioner for front passenger seat belt |
| 18 | Reel tensioner for front passenger seat belt (US version) |
| 19 | Safety battery terminal |
| 20 | Connection to starter motor and alternator |
| 21 | Battery |
| 22 | Reel tensioner for driver's seat belt (US version) |
| 23 | Belt tensioner for driver's seat belt |
| 24 | Seat belt buckle switch for front passenger seat belt |
| 25 | Belt buckle switch for driver belt |
| 26 | Ground point |
| 27 | Airbag sensor, B-pillar, driver's side |
| 28 | Battery cable monitoring wire |
| 29 | Side airbag, left |
| 30 | Driver's airbag |
| 31 | Steering column switch center (SZL) |
| 32 | Front door airbag sensor on driver's side (US version) |
| 33 | Indicator lamp for front passenger airbag deactivation |
| 34 | MRS control unit (with longitudinal and lateral acceleration sensor) |
| Instrumentation bus | Instrumentation bus |
| Body bus | Body bus |
| Body CAN | Body CAN |
| Terminal R | Terminal R |