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

Mazda CX-5 Service & Repair 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 ON (engine off or 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)

A

TNS signal

Front body control module (FBCM)

TNS OFF

1.0 or less

  • Related wiring harness

  • Front body control module (FBCM)

TNS ON

B+

B

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

C

Motor operation

Air intake actuator

Switched to RECIRCULATE

B+

  • Related wiring harness

  • Air intake actuator

Switched to FRESH

1.0 or less

D

Ground

Body ground

Under any condition

1.0 or less

  • Related wiring harness

E

Motor operation

Air intake actuator

Switched to RECIRCULATE

1.0 or less

  • Related wiring harness

  • Air intake actuator

Switched to FRESH

B+

F

Sensor GND

Evaporator temperature sensor

Under any condition

1.0 or less

  • Related wiring harness

  • Evaporator temperature sensor

G

Blower fan ON/OFF signal

Fan switch

Fan stopped

B+

  • Related wiring harness

  • Resistor

  • Fan switch terminal voltage (D)

Fan on

1.0 or less

H

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 (F)

I

Blower fan position signal

Fan switch

3rd, 4th

1.0 or less

  • Related wiring harness

  • Resistor

  • Fan switch terminal voltage (D)

off, 1st, 2nd

B+

J

B+

ROOM 15 A fuse

Under any condition

B+

  • Related wiring harness

  • ROOM 15 A fuse

K

LIN

Front body control module (FBCM)

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

  • Related wiring harness

  • Front body control module (FBCM)

L

IG2

Front body control module (FBCM)

Switch the ignition to ON

B+

  • Related wiring harness

  • Front body control module (FBCM)

Switch the ignition off

1.0 or less





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