Freeze Protection
WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
To prevent evaporator frozen up, the evaporator air temperature is monitored, and the voltage signal to the unified meter and A/C auto amp. will make the A/C relay go OFF and stop the compressor.