Mazda CX-5 Service & Repair Manual: Manual Air Conditioner Control System [Manual Air Conditioner]

Outline

• The climate control unit performs the following controls based on the signals from each switch/dial and the sensor.

• A/C compressor control

• Defroster control

Block Diagram

Outline of Control System

• Manual air conditioner has the following control.

A/C Compressor Control

• The climate control unit sends the A/C signal to the PCM based on the signals sent from the A/C switch, airflow volume control dial, and evaporator temperature sensor.

• The PCM turns the A/C relay on/off based on the input signals from the A/C signal and A/C pressure sensor and controls the A/C compressor (magnetic clutch) operation.

A/C signal on/off control

• When the A/C switch and fan switch are turned on, the climate control unit turns the A/C signal (magnetic clutch) on/off based on the temperature of the air passing through the evaporator.

• When the fan switch and A/C switch are turned on, the climate control unit controls the surface temperature of the evaporator so that it is within a certain range to prevent the evaporator from freezing.

• When the ambient temperature is low, the climate control unit sets the A/C signal (magnetic clutch) off-temperature to low to prevent window fogging.

Defroster control

• The defroster control improves the defrosting effect.

• When the defroster switch turns on, the climate control unit fixes the air intake mode to FRESH.

• The air intake is fixed at FRESH even if it has been set to REC manually.