Analog Activation of Auxiliary Heater
Analog activation is realized by means of a switched ground supply at plug connector X764 Pin 3 on the auxiliary heater.
The AUXILIARY HEATER ON request is sent by the heating/air conditioning control unit via the K-bus to the auxiliary heater . The auxiliary heater now switches on and sends a feedback via the K-bus to the heating/air conditioning control unit. If the feedback is not recognized by the heating/air conditioning control unit within the next few seconds, the switching procedure is interrupted.
Connector pin assignments of auxiliary heater