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E90 General Vehicle Electrical
Dynamic Stability Control (DSC)
The DSC module provides information pertaining to the wheel speed sensors to the
CAS2
(DSC via PT-CAN - JBE via K-CAN - CAS2 )
A redundant speed sensor signal is also provided directly to CAS2 by way of a direct con-
nection from the DSC module to CAS2.
Junction Box Electronics Control Module (JBE)
The JBE is is the gateway module for transmitting the data from the DSC module to the
CAS2.
Electric Steering Lock (ELV)
The ELV module is responsible for activating the mechanical components that lock and
unlock the steering column.
Operation of ELV
Safety Concept
A special safety concept is necessary in view of the special safety requirements of the
system. The safety concept must ensure that the steering cannot be locked while dri-
ving.
As the master control module, the CAS2 evaluates all input signals, checks them and
issues the enable signal to the ELV control module for the lock and unlock functions. The
control unit of the electric steering lock system is therefore the executing component in
the safety concept.
Electronic Function
The CAS2 monitors the various driving or standstill situations of the vehicle (signal from
DSC) and is also the control module that triggers/enables the unlocking or locking action
by supplying power and ground to the ELV. CAS2 changes the polarity signal provided to
the ELV depending if the steering is to be locked or unlocked.
When CAS2 supplies a signal to the ELV a ground connection is applied first then power,
the opposite occurs when the signal is removed. No power is applied to the ELV when
the vehicle is not moving.
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