System Outline

The A/C amplifier receives various signals, such as the engine RPM and coolant temperature from the engine control module, etc.

When the engine is started and the A/C SW (A/C control assembly) is on, a signal is sent to the A/C amplifier.

As a result, current flows from the IG1 NO. 2 fuse to TERMINAL 2 of the MG CLT relay to TERMINAL 1 to TERMINAL MGC of the A/C amplifier to GROUND, turning the MG CLT relay on, so that the magnetic clutch comes on and the A/C compressor operates.

If the integration control panel detects the following conditions, it stops the air conditioning:

* Evaporator outlet air temperature is too low.

* There is a marked difference between the compressor speed and the engine speed.

* The refrigerant pressure is abnormally high or abnormally low.

* The engine speed is too low.

* Rapid acceleration occurs.