Intake Sensor
WARNING: This page is about a different car, the 2004 Infiniti FX45 and 2004 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
The intake sensor is located on the heater & cooling unit. It converts temperature of air after it passes through the evaporator into a resistance value which is then input to the unified meter and A/C amp.
Courtesy of NISSAN MOTOR CO., U.S.A.