Task, In Conjunction W/AAC

Actuation of engine coolant circulation pump
The front coolant circulation pump is actuated by the right signal acquisition and actuation module (SAM) at the request of the AAC pushbutton control module. The right SAM reports back the status to the AAC pushbutton control module. Switching on the coolant circulation pump is requested by the AAC pushbutton control module under certain operating conditions and also when the ignition is switched off (e.g. residual engine heat utilization).


NOTE: On vehicles with rear air conditioning the rear coolant circulation pump is actuated directly by the rear AC control module in contrast to the concept for automatic air conditioning.