Mazda 3 manuals

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

Mazda 3 Service Manual / HVAC / A/C / Climate Control Unit Inspection [Manual 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 the body ground.

4. By inserting the positive (+) lead of the tester into the climate control unit connector, 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

Motor operation

Air intake actuator

Switched to RECIRCULATE

B+

  • Related wiring harness

  • Air intake actuator

Switched to FRESH

1.0 or less

1C

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 (1G)

1D

1E

1F

Motor operation

Air intake actuator

Switched to RECIRCULATE

1.0 or less

  • Related wiring harness

  • Air intake actuator

Switched to FRESH

B+

1G

Sensor GND

  • Evaporator temperature sensor

  • Refrigerant pressure sensor*1

Under any condition

1.0 or less

  • Related wiring harness

  • Evaporator temperature sensor

  • Refrigerant pressure sensor

  • Climate control unit: terminal voltage (1H)

1H*1

+5 V

Refrigerant pressure sensor

Switch the ignition to ON

5

  • Related wiring harness

  • Climate control unit: terminal voltage (1G)

Switch the ignition to Off

1.0 or less

1I

Ground

Body ground

Under any condition

1.0 or less

  • Related wiring harness

1J

1K*2

Fan switch position

Fan switch

Fan switch position 0, 1 and 2

B+

  • Fan switch

Fan switch position 3 and 4

1.0 or less

1L

Blower fan ON/OFF signal

Fan switch

Fan stopped

B+

  • Fan switch terminal voltage (D)

Fan on

1.0 or less

2A

Illumination (-)

Instrument cluster

Headlight ON and panel light control MAX

2.0

  • Instrument cluster

  • Related wiring harness

Headlight ON and panel light control MIN

9.65

2B

B+

ROOM 15 A fuse

Under any condition

B+

  • Related wiring harness

  • ROOM 15 A fuse

2C

2D

LIN

BCM

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

  • Related wiring harness

  • BCM

2E

2F

TNS signal

TNS relay

TNS OFF

1.0 or less

  • Related wiring harness

  • TNS relay

  • BCM

  • Headlight switch

TNS ON

B+

2G

2H

IG2

HEATER 10 A fuse

IG SW ON

B+

  • Related wiring harness

  • HEATER 10 A fuse

IG SW LOCK

1.0 or less

2I

2J*1

Refrigerant pressure sensor signal

Refrigerant pressure sensor

Compared with temperature detected by refrigerant pressure sensor

(See REFRIGERANT PRESSURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].)

  • Related wiring harness

  • Refrigerant pressure sensor

2K

Rear window defroster indicator

BCM

Rear window defroster OFF

11.12

  • Related wiring harness

  • BCM

Rear window defroster ON

1.0 or less

2L

2M

2N

2O

Rear window defroster signal

BCM

While pressed rear window defroster switch

1.0 or less

  • Related wiring harness

  • Rear window defroster switch

  • BCM

Released rear window defroster switch

4.7

2P

A/C signal

Instrument cluster

A/C ON

1.0 or less

  • Related wiring harness

  • Instrument cluster

A/C OFF

4.8


*1 MZR 2.0, MZR 2.5

*2 SKYACTIV-G 2.0



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