Ambient Sensor
WARNING: This page is about a different car, the 2001 Isuzu VehiCROSS. However, it is still accessible from the selected car via links, so may be relevant.
Ambient sensor is attached to right front of condenser. This sensor monitors ambient temperature and converts temperature reading into a resistance value. Resistance value is sent to automatic control unit. If automatic control unit detects an abrupt ambient temperature change, it will gradually adjusts cabin temperature until desired setting is reached.