Steering Column Switch Center (SZL)
The Steering Column Switch Center (SZL) handles all functional components of the Multi-Function Steering Wheel (MFL) and the steering column. Those functions include:
- Audio system, telephone, transmission shift, horn and a freely programmable-function button via the MFL function buttons.
- Direction indicators/high-beam headlights, transmission selector lever, windscreen wiper, cruise control via the 4 control stalks on the steering column.
- Electrical steering wheel adjustment via the button on the left of the steering column.
- Steering wheel heater via the button on the left of the steering column.
The electronic control system for the SZL is divided between two electronic modules that are integrated respectively in the Steering Column Switch Center and inside the steering wheel.
Signal transmission from the controls of the MFL is passed on to the SZL by means of a coil-spring (slip-ring) conductor.
The steering angle sensor for DSC is also integrated in the SZL. The SZL processes the control commands and sends them via the byteflight bus system to the appropriate control units (e.g. DSC, LM).
The E65 is the first model on which a steering column switch center with such an extensive range of functions has been used.
Integrated Steering wheel Electronics Module located in steering wheel.
Exploded view of the SZL and integrated steering angle sensor.
The steering angle sensor is a component of the SZL module and is integrated inside it.
The SZL is a satellite of the overall ISIS system (Intelligent Safety and Integration System) on the byteflight bus system.
More detailed information about the Intelligent Safety and Integration System can be found in the chapter "Passive Safety."
In addition to the bus link, there are also two hard-wire cable connections to the LM and EGS systems for (redundancy) safety reasons.