ACCS (ADVANCED CLIMATE CONTROL SYSTEM) : Automatic Intake Control (Exhaust Gas / Outside Odor Detecting Mechanism): Description
WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
In addition to air inlet automatic control of front automatic air conditioning system, A/C auto amp. controls automatically air inlet according to signal from exhaust gas / outside odor detecting sensor, so that unpleasant outside odor does not enter in passenger room.