59
The “Compressor On/Off“ interface ...
... serves to provide the engine control unit
with information on the circuit state of the
compressor.
... enables the engine control unit to switch off
the compressor or inhibit start-up.
... provides a link to the air conditioner’s
operating and display unit.
The interface as a signal input:
Shortly before switching on the magnetic
coupling, the air conditioner’s operating and
display unit applies voltage to the interface.
The engine control unit then increases the
idling speed to compensate for the higher
engine load.
The interface as a signal output:
If the engine control unit applies an earth
potential to the interface, the compressor is
switched off for a defined period of time as
required.
The engine control unit switches the
compressor off in the following situations:
-
After initiating basic setting (function 04)
-
In certain emergency running programs
within a defined engine speed range
The immobiliser/diagnosis interface ...
... is the communication link between the
engine control unit and the immobiliser in the
dash panel insert.
... also serves as the diagnosis wire (K-wire) for
the diagnosis tester. Dialogue takes place via:
diagnosis plug
⇔
dash panel insert interface
⇔
immobiliser/diagnosis interface
⇔
engine
control unit
Summary of Contents for 2.7-litre V6 Biturbo
Page 47: ...48 Notes ...
Page 71: ...72 Notes ...
