X Series E70 X5 3.0Si (N52K) OFFRD
The driver sets the tyre pressure to be monitored. He instructs the system via the control function in iDrive or via
the RDC button to save the current tyre pressure as the target pressure value (Reset).
The RDC control unit tests the target value for plausibility before saving it (axle by axle comparison of target
pressures, minimum pressures).
A reset is only possible when the air pressure in all wheels is at least 1.6 bar. If the tyre pressure of a wheel is
under this limit, a check-control message will be issued immediately.
If the pressure difference between the wheels on an axle is > 0.4 bar, the reset will be rejected after the
plausibility test. A check-control message will be issued. Remedy: Set the tyre pressures to the correct values
and repeat the reset.
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Body
The following systems are described under "Body electrics/electronics":
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Power supply
Two software functions are of fundamental importance for the power supply:
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Energy management
The energy management system ensures that sufficient starting power is always available. Energy
management monitors the vehicle even when the engine is not running.
The energy management system monitors all components in the vehicle which generate, store and
consume energy.
•
Power management
The power management system is a subsystem of the energy management system. Power management is
controlled by the engine control unit (DME or DDE: digital engine electronics or digital diesel electronics).
While the vehicle is in motion, power management regulates the output of the alternator and the battery
charge.
•
Intelligent alternator regulation see Chapter Drive
The central element of the power supply is the junction box. The junction box consists of a power distributor and
a control unit, the Junction Box Electronics (JBE).
There is a power distributor in the luggage compartment: the rear fuse block. The fuse block is attached to the
vehicle battery by a retaining clip.
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Car Access System
In addition to the CAS control unit, the following components are also installed.
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START-STOP unit, comprising the START-STOP button and the remote control holder
•
Electric steering lock (ELV, not on US version)
A new generation of electronic immobiliser is being introduced on vehicles with spark-ignition engine (4th
generation EWS)
The 4th generation EWS is an advanced development of the previous electronic immobiliser. This advanced
development uses an innovative, state-of-the-art encoding method.
Each vehicle is assigned a 128 bit secret code. This secret code is stored in a BMW database. The secret code
is thus known only to BMW.
The secret code is programmed and locked in the following control units:
SBT Electrical systems E70, E71
BMW AG - TIS
07.02.2013 11:39
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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