1 Series E81 118i (N46T) 3-door
The steering column switch cluster (SZL) is connected to the vehicle wiring harness via 2 plug connectors.
[more]
The steering column switch cluster consists of the following components:
-
Evaluation electronics
The evaluation electronics analyse the signals from the components and send them as CAN messages on the
F-CAN.
The evaluation electronics include the following components:
•
Microprocessor
•
Power supply
•
F-CAN connection
•
Interfaces for optical and electrical input signals
-
Steering-angle sensor
The steering-angle sensor optically detects the steering angle turned at the steering wheel by means of an
encoded disc.
The data is read and analysed by the evaluation electronics. The data is transmitted directly to the DSC via the
F-CAN. (F-CAN = Chassis CAN; DSC = Dynamic Stability Control.)
Signal path:
SZL -> F-CAN -> DSC
[more ...]
-
Steering column stalk
The lever positions of all steering column stalks are optically monitored.
The actions of pressing the buttons, turning the thumbwheels and pressing the rocker switches are detected by
switching mats. The switching mats forward the position of the buttons and thumbwheels as voltage signals.
Depending on the vehicle's equipment, the steering column switch cluster (SZL) could have the following
steering column stalks:
•
Wiper/washer switch
The switch signals are read into the steering column switch cluster where they are evaluated. The
evaluated switch signals are emitted onto the F-CAN as a CAN message (It is only possible to check the
switch positions with the BMW diagnosis system via DSC as the steering column switch cluster is not
directly connected to the diagnosis system).
•
Cruise-control system steering column stalk
The switch signals are read into the steering column switch cluster where they are evaluated. The
evaluated switch signals are emitted onto the F-CAN as a CAN message (It is only possible to check the
switch positions with the BMW diagnosis system via DSC as the steering column switch cluster is not
directly connected to the diagnosis system).
•
Turn-signal/main-beam switch
The switch signals are read into the steering column switch cluster where they are evaluated. The
evaluated switch signals are resistance-encoded and transmitted from the steering column switch cluster by
direct wires to the FRM (footwell module).
The signals for the on-board computer functions are transmitted by a direct wire to the instrument cluster
(KOMBI).
[more ...]
-
Coil spring cassette
The coil spring cassette has the task of transferring electrical signals to or from the steering wheel.
SBT Steering Column Switch E70, E71, E81, E82, E87, E90, E91, E92, E93
BMW AG - TIS
19.01.2013 06:26
Issue status (12/2007) Valid only until next DVD is issued
Copyright
Page - 2 -
