Mazda 3 manuals

Mazda 3 Service Manual: Climate Control Unit Inspection [Full Auto Air Conditioner]

Mazda 3 Service 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 to 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

+5V

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Solar radiation sensor

  • Refrigerant pressure sensor*1

Switch the ignition to ON

5

  • Related wiring harness

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Solar radiation sensor

  • Refrigerant pressure sensor*1

  • Climate control unit: terminal voltage (1E)

Switch the ignition to Off

1.0 or less

1D

GND

Body ground

Under any condition

1.0 or less

  • Related wiring harness

1E

Sensor GND

  • Driver-side air mix actuator

  • Passenger-side air mix actuator

  • Airflow mode actuator

  • Evaporator temperature sensor

  • Refrigerant pressure sensor*1

Under any condition

1.0 or less

  • Related wiring harness

  • Climate control unit: terminal voltage (1C)

1F

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 (1C)

  • Solar radiation sensor

Blocking light to solar radiation sensor

1.0 or less

1G

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 (1C)

Set temperature at MAX COLD

1.0 or less

1H

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 (1C)

  • Solar radiation sensor

Blocking light to solar radiation sensor

1.0 or less

1I

Potentiometer input

Passenger-side air mix actuator

Set temperature at MAX COLD

1.0 or less

  • Related wiring harness

  • Passenger-side air mix actuator

  • Climate control unit: terminal voltage (1C)

Set temperature at MAX HOT

4.3 or more

1J

—

—

—

—

—

1K

Potentiometer input

Airflow mode actuator

VENT

4.3 or more

  • Related wiring harness

  • Airflow mode actuator

  • Climate control unit: terminal voltage (1C)

BI-LEVEL

3.4

HEAT

2.5

HEAT/DEF

1.6

DEFROSTER

0.7 or less

1L

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 (1C)

1M

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

1N

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

9.8

Fan: manual 7th

0.4 or less

1O

—

—

—

—

—

1P

—

—

—

—

—

1Q

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+

1R

Motor operation (FRESH)

Air intake actuator

Moving towards RECIRCULATE

1.0 or less

  • Related wiring harness

  • Air intake actuator

Moving towards FRESH

B+

1S

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

1T

Motor operation (RECIRCULATE)

Air intake actuator

Moving towards RECIRCULATE

B+

  • Related wiring harness

  • Air intake actuator

Moving towards FRESH

1.0 or less

1U

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+

1V

Motor operation (DEFROSTER)

Airflow mode actuator

Moving towards DEFROSTER

B+

  • Related wiring harness

  • Airflow mode actuator

Moving towards VENT

1.0 or less

1W

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

1X

Motor operation (VENT)

Airflow mode actuator

Moving towards VENT

B+

  • Related wiring harness

  • Airflow mode actuator

Moving towards DEFROSTER

1.0 or less

2A

Illumination control

Instrument cluster

Headlight switch ON and panel light control switch at MAX

1.0 or less

  • Related wiring harness

  • Instrument cluster

Headlight switch ON and panel light control switch at MIN

11.5

2B

B+

ROOM 15 A fuse

Under any condition

B+

  • Related wiring harness

  • ROOM 15 A fuse

2C

—

—

—

—

—

2D

—

—

—

—

—

2E

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

2F

TNS signal

TNS relay

TNS ON

B+

  • Related wiring harness

  • TNS relay

  • BCM

  • Headlight switch

TNS OFF

1.0 or less

2G

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

2H

IG2

HEATER 10 A fuse

Switch the ignition to ON

B+

  • Related wiring harness

  • HEATER 10 A fuse

Switch the ignition to Off

1.0 or less

2I

—

—

—

—

—

2J*1

Refrigerant pressure sensor input

Refrigerant pressure sensor

Compared with temperature detected by refrigerant pressure sensor

(See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

  • Related wiring harness

  • Refrigerant pressure sensor

  • Climate control unit: terminal voltage (1C,1E)

2K

—

—

—

—

—

2L

—

—

—

—

—

2M

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 (2N)

2N

Passenger compartment temperature sensor GND

Passenger compartment temperature sensor

Under any condition

1.0 or less

  • Climate control unit: terminal voltage (2M)

2O

—

—

—

—

—

2P

—

—

—

—

—


*1 MZR 2.3 DISI Turbo, MZR 2.5




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