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Mazda CX-5 Service & Repair Manual: Climate Control Unit Inspection [Full Auto Air Conditioner]

Mazda CX-5 Service & Repair Manual / HVAC / A/C / Climate Control Unit Inspection [Full Auto Air Conditioner]

1. Remove the climate control unit with the connector connected..

2. Switch the ignition ON (engine off or on).

3. Connect the negative (-) lead of the tester to body ground.

4. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.

Terminal Voltage Table (Reference)



Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

1A

1B

1C*1

Seat warmer switch signal

Seat warmer control unit

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

  • Related wiring harness

1D

1E

B+

ROOM 15 A fuse

Under any condition

B+

  • Related wiring harness

  • ROOM 15 A fuse

1F

Evaporator temperature sensor input

Evaporator temperature sensor

Compared with temperature detected by evaporator temperature sensor

Refer to graph 1

  • Related wiring harness

  • Evaporator temperature sensor

  • Climate control unit: terminal voltage (1X)

1G

IG1

C/U IG1 15 A fuse

Switch the ignition to ON

B+

  • Related wiring harness

  • C/U IG1 15 A fuse

Switch the ignition off

1.0 or less

1H

+5V

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Solar radiation sensor

Under any condition

5

  • Related wiring harness

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Solar radiation sensor

  • Climate control unit: terminal voltage (1X)

1I

1J

Passenger compartment temperature sensor input

Passenger compartment temperature sensor

Compared with temperature detected by passenger compartment temperature sensor

Refer to graph 2

  • Related wiring harness

  • Passenger compartment temperature sensor

  • Climate control unit: terminal voltage (1X)

1K

1L

1M

1N

Potentiometer input

Driver-side air mix actuator

Set temperature at MAX HOT

4.3 or more

  • Related wiring harness

  • Driver-side air mix actuator

  • Climate control unit: terminal voltage (1X)

Set temperature at MAX COLD

1.0 or less

1O

1P

Potentiometer input

Passenger-side air mix actuator

Set temperature at MAX HOT

4.3 or more

  • Related wiring harness

  • Passenger-side air mix actuator

  • Climate control unit: terminal voltage (1X)

Set temperature at MAX COLD

1.0 or less

1Q

1R

Potentiometer input

Airflow mode actuator

VENT

4.3 or more

  • Related wiring harness

  • Airflow mode actuator

  • Climate control unit: terminal voltage (1X)

BI-LEVEL

3.4

HEAT

2.5

HEAT/DEF

1.6

DEFROSTER

0.7 or less

1S

MS_CAN_H

CAN related module

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

  • Related wiring harness

1T

Solar radiation sensor (RH) input

Solar radiation sensor

Sunlight shined directly on the solar radiation sensor

4

  • Related wiring harness

  • Climate control unit: terminal voltage (1H)

  • Solar radiation sensor

Blocking light to solar radiation sensor

1.0 or less

1U

MS_CAN_L

CAN related module

Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.

  • Related wiring harness

1V

Solar radiation sensor (LH) input

Solar radiation sensor

Sunlight shined directly on the solar radiation sensor

4

  • Related wiring harness

  • Climate control unit: terminal voltage (1H)

  • Solar radiation sensor

Blocking light to solar radiation sensor

1.0 or less

1W

GND

Body ground

Under any condition

1.0 or less

  • Related wiring harness

1X

Sensor GND

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Evaporator temperature sensor

Under any condition

1.0 or less

  • Related wiring harness

  • Climate control unit: terminal voltage (1H)

2A

Blower motor feedback

  • Blower motor

  • Power MOS FET

Fan stopped

B+

  • Power MOS FET

  • Blower motor

  • Blower relay

  • HEATER 40 A fuse

  • Power MOS FET replacement

  • Related wiring harness

Fan: manual 1st

10.33

Fan: manual 7th

0.4 or less

2B

2C

IG2

Front body control module (FBCM)

Switch the ignition ON (engine off or on)

B+

  • Related wiring harness

  • Front body control module (FBCM)

Switch the ignition off

1.0 or less

2D

Blower fan speed control

Power MOS FET

Fan stopped

1.0 or less

  • Related wiring harness

  • Power MOS FET

Fan: manual 1st

2.2

Fan: manual 7th

9.7

2E

Motor operation (HOT)

Driver-side air mix actuator

Moving towards HOT

B+

  • Related wiring harness

  • Driver-side air mix actuator

Moving towards COLD

1.0 or less

2F

Motor operation (HOT)

Passenger-side air mix actuator

Moving towards HOT

B+

  • Related wiring harness

  • Passenger-side air mix actuator

Moving towards COLD

1.0 or less

2G

Motor operation (COLD)

Driver-side air mix actuator

Moving towards HOT

1.0 or less

  • Related wiring harness

  • Driver-side air mix actuator

Moving towards COLD

B+

2H

Motor operation (COLD)

Passenger-side air mix actuator

Moving towards HOT

1.0 or less

  • Related wiring harness

  • Passenger-side air mix actuator

Moving towards COLD

B+

2I

Motor operation (VENT)

Airflow mode actuator

Moving towards VENT

B+

  • Related wiring harness

  • Airflow mode actuator

Moving towards DEFROSTER

1.0 or less

2J

Motor operation (FRESH)

Air intake actuator

Moving towards RECIRCULATE

1.0 or less

  • Related wiring harness

  • Air intake actuator

Moving towards FRESH

B+

2K

Motor operation (DEFROSTER)

Airflow mode actuator

Moving towards DEFROSTER

B+

  • Related wiring harness

  • Airflow mode actuator

Moving towards VENT

1.0 or less

2L

Motor operation (RECIRCULATE)

Air intake actuator

Moving towards RECIRCULATE

B+

  • Related wiring harness

  • Air intake actuator

Moving towards FRESH

1.0 or less


*1 With seat warmer.




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