Steering Wheel Heater

SZL Steering Column Switch Center And Steering Wheel Heating

The functions of the SZL (steering column control center) can be subdivided into three main blocks:
- SZL as control module for activating the driver's airbag
- The SZL as the switchboard for the control functions on the steering column:
- semi-electric and/or fully electric steering column adjustment -> button on the steering column
- Steering wheel heating -> via the button on the steering column

- SZL as steering-angle sensor.

The multi-function steering wheel provides the means by which the driver can easily and ergonomically perform the following functions:
- audio, telephone, Steptronic, fanfare (horn) and a definable button -> via the function buttons of the multi-function steering wheel
- direction indicators / high beam headlights, windshield wiper, cruise control, -> via the control levers on the steering column

Brief description of components

The multi-function steering wheel consists of
- Steering-column lever: All steering-column levers are incremental keys and no longer lock in the operated position
- Fanfare (horn)
- 4 Steptronic buttons
- 2 blocks with function keys
- Airbag system
- Heating coil and temperature sensor in the steering wheel rim

Located below the multi-function steering wheel are
- 2 buttons on the steering column (steering wheel adjustment, steering wheel heater)
- the control module steering column control center with integral steering angle sensor

The electronic control system for the steering column control center and the multifunction steering wheel is divided into two electronic modules:
- Steering column electronics (= steering column switch center)
- Steering wheel module

Signal transmission from the steering wheel module to the steering column module is effected by means of a coil-spring conductor.

Steering wheel heater
The steering wheel heating system consists of
- a button on the steering column for switching the steering wheel heater on and off
- a function indicator in the steering wheel heater switch which lights up when the steering wheel heater is on.
- the heater coil in the steering wheel rim which heats up the steering wheel
- a temperature sensor in the steering wheel rim which sends the temperature signal back to the steering column module.
- The steering column control center activates the heater coil as required in order to ensure even heating of the steering wheel.

Service functions

Note on safety
For all work on the steering column switch center, comply with the safety legislation for work on airbags!

Disconnect battery!