28
F
F
F
F
F
S
F
S
S
F
3
1
7
5
2/25
2/50
2/49
2/05
2/04
2/01
2/02
9
10
4
8
System components
Control unit J197 transmits the information
concerning the vehicle level and the system
status back to the E281 via the K wire,
whereupon the electronic unit actuates the
relevant LEDs.
For self-diagnosis reasons, the “raise” button
is designed as a redundant additional
interface.
Operating unit for self-
levelling E281
The operation and displays of the operating
unit are described on page 7. In this section,
the function of the operating unit will be
described.
The interface to control unit J197 is
performed by means of a data
communication wire (K wire)
An electronic unit integrated into the
operating unit evaluates the signals from the
level button and transmits these as a
corresponding data protocol via the K wire
to control unit J197.
243_013
The K wire between E281 and J197
bears no relation to the self-diagnostic
K wire between J197 and the
diagnostic testers.
Electronic unit
Control unit J197
Terminal 30Terminal 15
Raise button
K wire
Operating unit E281
Terminal 58s
Terminal
58d
to the ESP control unit
from the ESP control unit
HL2
HL1
NL
LL
man
High
Low
Lower button
ESP button
F = LEDs for functional illumination
S = LEDs for switch illumination
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