5 Series E61 523i (N52) TOUR
Single-axle electronic height control largely comprises the following components:
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Air supply unit
The air supply unit includes the following components:
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Electric motor for driving compressor
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Compressor with air drier
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Drain valve with pressure-holding and pressure-limitation function
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Electric control valve
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Solenoid valve block with 2 solenoid valves (2/2-way valves)
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EHC control unit
The EHC control unit (EHC = electronic height control) decides on a case-by-case basis whether there is a need
for intervention to compensate for changes in load.
Besides height control, the EHC control unit also has the task of monitoring system components and of storing
and displaying faults.
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2 air springs
The air springs are located in place of the steel springs. The air springs form the airtight, moving connection
between the body and the wheel carrier. The air pressure in the air spring supports the vehicle's weight. The air
springs and the impact absorbers are separate components.
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2 level sensors
The EHC control unit receives information about the ride height on the left and right-hand sides of the vehicle
from the level sensors. The level sensors are installed on the rear axle.
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Check Control
A fault in the single-axle electronic height control is indicated on the LCD display with a Check-Control symbol
(yellow). The text for the Check-Control message can be called up in the Central Information Display (CID).
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The following control units are involved in the operation of the single-axle electronic height control (in alphabetical
order):
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CAS: Car Access System
The CAS (Car Access System) controls the relay for terminal 30g on the rear electrical distributor. This allows
the EHC control unit to be activated and deactivated in a defined manner.
The CAS supplies the terminal status (e.g. terminal 15 ON or OFF) to the EHC control unit via the K-CAN.
[for further information, please refer to SI Technology (SBT) 61 03 03 019]
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DME or DDE: Digital engine electronics or digital diesel electronics
The digital engine electronics / digital diesel electronics supplies the EHC control unit with the "engine running"
signal.
Signal path: DME or DDE -> PT-CAN -> SGM or KGM or JBE -> EHC control unit
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DSC: Dynamic Stability Control
DSC (Dynamic Stability Control) supplies the following signals to the EHC control unit:
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Vehicle road speed
SBT Single-axle electronic height control E61, E70, E71
BMW AG - TIS
06.02.2013 00:51
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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