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Mazda CX-5 Service & Repair Manual: Airflow Volume Control [Full Auto Air Conditioner]

Mazda CX-5 Service & Repair Manual / HVAC / A/C / Airflow Volume Control [Full Auto Air Conditioner]

Purpose

Function

Airflow Volume Automatic Control


Airflow Volume Manual Control


Airflow volume control dial

Blower motor applied voltage

1st

3.5 V

2nd

5.2 V

3rd

6.9 V

4th

8.6 V

5th

10.0 V

6th

12.1 V

7th

14.6 V*1, 13.0*2


*1 When the airflow mode is except HEAT.

*2 When the airflow mode is HEAT.

Correction


Correction name

Set temperature

Blower motor applied voltage

MAX HOT correction

32.0/90

12.1 (V): AUTO-HI

MAX COLD correction

15.0/60

14.6 (V): MAX-HI


Construction


Input device

Control part

Output device

  • Airflow volume control dial (climate control unit)

  • Temperature setting dial (climate control unit)

  • Passenger compartment temperature sensor

  • Solar radiation sensor

  • Ambient temperature sensor

  • Engine coolant temperature sensor

  • Airflow mode actuator

  • Climate control unit

  • PCM

  • Front body control module (FBCM)

  • Instrument cluster

  • Power MOS FET

  • Blower motor


Operation

1. The climate control unit sends a fan operation signal to the front body control module (FBCM) based on the airflow volume control dial ON operation.

2. When the front body control module (FBCM) turns on the blower relay based on the fan operation signal, the blower motor rotates.

3. The climate control determines the airflow volume based on the operations of the airflow volume control dial and the temperature setting dial, airflow mode condition, and signals from each sensor.

4. Based on the result of the airflow volume determination and correction, the climate control unit control the power MOS FET and changes the airflow volume (blower motor applied voltage).

5. The rotation speed of the blower motor changes according to the applied voltage from the power MOS FET.


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Ambient Temperature Sensor Inspection [Full Auto Air Conditioner]
1. Measure the temperature around the ambient temperature sensor and measure the resistance between the ambient temperature sensor terminal. If the characteristics of the ambient tempera ...

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