Unified meter and A/C amp. (Automatic Amplifier)
WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
The unified meter and A/C amp. has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix door motors, mode door motor, intake door motor, blower motor and compressor are then controlled.
The unified meter and A/C amp. is unitized with control mechanisms. When the various switches and temperature dials are operated, data is input to the unified meter and A/C amp. from the BCM using CAN communication.
Self-diagnostic functions are also built into unified meter and A/C amp. to provide quick check of malfunctions in the auto air conditioner system.