Steering Column Switch Cluster Szl

Steering Column Switch Cluster SZL





The steering column switch cluster consists of two modules, the steering column electronics (LSE) and the steering wheel electronics (LRE). The two electronic components are connected to each other by a coil spring.
The steering column switch cluster controls and monitors the two trigger circuits for the front airbag on the drivers side.
The components connected directly to the steering column electronics are listed below:
^ Connection to the byteflight
^ The steering angle sensor
^ The direction of travel dip switch
^ The wiper switch
^ The switch for the cruise control system (tempomat)
The coil spring establishes the connection to the steering wheel electronics (LRE). The coil spring carries signals and power.
The components connected directly to the steering wheel electronics are:
^ The steering wheel heating with temperature sensor
^ The Steptronic buttons
^ The horn buttons for the fanfare horns
^ The multifunction switch arrays
^ The trigger output stage for the drivers side front airbag
The steering column switch cluster also features the following components:
^ The switch for steering wheel heating
^ The switch for steering wheel adjustment
The steering column electronics unit (LSE) is connected to the SGM by the byteflight. Terminal 30 carries the power supply and load current.
The Seattleites emergency supply is via terminal V_SIM of the SGM, with a storage capacitor as buffer. This supply is sustained even in sleep mode.
Terminal 15 is provided for the sake of redundancy. The two fanfares (horns) are powered directly by the steering wheel electronics from terminal R.
The steering column switch cluster accommodates the steering angle sensor, which sends its data by the F_CAN bus to the DSC and AFS. The data is also transmitted by the byteflight and the SGM to the PTCAN bus. There is also a serial connection to the control unit for the Active Front Steering system.
A coil spring interconnects the steering column electronics and the steering wheel electronics. The trigger output stage and capacitor are in the steering wheel electronics. The two trigger circuits for stages 1+2 of the drivers front airbag are connected to the trigger output stage.





Triggering and monitoring of the trigger circuits are similar to the processes for the B-pillar satellites.