Mazda CX-9 Grand Touring. Manual — part 429

Fig. 55: Refrigerant Pressure Switch Terminals Continuity Chart (3 Of 3)
Courtesy of MAZDA MOTORS CORP.

FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION

1. Disconnect the negative battery cable.

2. Remove the following parts:

1. Decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)

2. Front console box mat (See FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION .)

3. Indicator panel (See INDICATOR PANEL REMOVAL/INSTALLATION .)

4. Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION .)

5. Center panel (See CENTER PANEL REMOVAL/INSTALLATION .)

3. Remove the screws.

4. Remove the front climate control unit.

5. Install in the reverse order of removal.

Fig. 56: Identifying Front Climate Control Unit & Screws
Courtesy of MAZDA MOTORS CORP.

FRONT CLIMATE CONTROL UNIT INSPECTION

2008 Mazda CX-9 Grand Touring

2008 HVAC Control System (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:12:36 AM

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1. Connect the front climate control unit connector.

2. Turn the ignition switch to the ON position.

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

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

voltage according to the terminal voltage table.



If there is any malfunction, inspect the parts under "Inspection item (s)".



If the parts under "Inspection item (s)" are found to be normal, replace the front climate
control unit.

TERMINAL VOLTAGE TABLE (REFERENCE)

Fig. 57: Identifying Front Climate Control Unit Terminal
Courtesy of MAZDA MOTORS CORP.

TERMINAL VOLTAGE REFERENCE

Terminal Signal name

Connected to

Measurement
condition

Voltage

(V)

Inspection item (s)

1A

Motor
operation

Driver-side front
air mix actuator

Temperature control
dial (driver side):
Moving towards
COLD

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-driver-side front
air mix actuator: 1A-G,
1F-F)



Driver-side front air
mix actuator

Temperature control
dial (driver side):
Moving towards
HOT

B+

1B

B+

BCM

Under any
condition

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-BCM: 1B-5H)



BCM

1C

Motor
operation

Passenger-side
front air mix
actuator

Temperature control
dial (passenger
side): Moving
towards COLD

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-passenger-side
front air mix actuator:

Temperature control

2008 Mazda CX-9 Grand Touring

2008 HVAC Control System (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:12:36 AM

Page 35

© 2005 Mitchell Repair Information Company, LLC.

dial (passenger
side): Moving
towards HOT

1.0 or
less

1C-G, 1E-F)



Passenger-side front
air mix actuator

1D

Seat warmer
(LH) on/off

Seat warmer relay

Seat warmer switch
off

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-seat warmer (LH)
relay (relay block):
1D-A)



Seat warmer (LH)
relay

Seat warmer switch
on

1.0 or
less

1E

Motor
operation

Passenger-side
front air mix
actuator

Temperature control
dial (passenger
side): Moving
towards COLD

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-passenger-side
front air mix actuator:
1C-G, 1E-F)



Passenger-side front
air mix actuator

Temperature control
dial (passenger
side): Moving
towards HOT

B+

1F

Motor
operation

Driver-side front
air mix actuator

Temperature control
dial (driver side):
Moving towards
COLD

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-driver-side front
air mix actuator: 1A-G,
1F-F)



Driver-side front air
mix actuator

Temperature control
dial (driver-side):
Moving towards
HOT

1.0 or
less

1G

Motor
operation

Rear air mix
actuator

Temperature control
dial (rear side):
Moving towards
COLD

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-Rear air mix
actuator: 1G-F, 1I-G)



Rear air mix actuator

Temperature control
dial (rear side):
Moving towards
HOT

1.0 or
less

1H

Motor
operation

Front airflow
mode actuator

Defroster switch on

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-front airflow
mode actuator: 1H-G,
1J-F)



Front airflow mode
actuator

Mode switch:
Moving towards
VENT

B+

Temperature control

2008 Mazda CX-9 Grand Touring

2008 HVAC Control System (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:12:36 AM

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© 2005 Mitchell Repair Information Company, LLC.

1I

Motor
operation

Rear air mix
actuator

dial (rear side):
Moving towards
COLD

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-Rear air mix
actuator: 1G-F, 1I-G)



Rear air mix actuator

Temperature control
dial (rear side):
Moving towards
HOT

B+

1J

Motor
operation

Front airflow
mode actuator

Defroster switch on

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-front airflow
mode actuator: 1H-G,
U-F)



Front airflow mode
actuator

Mode switch:
Moving towards
VENT

1.0 or
less

1K

Seat warmer
(RH) on/off

Seat warmer relay

Seat warmer switch
off

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-seat warmer (RH)
relay (main fuse
block): 1K-A)



Seat warmer (RH)
relay

Seat warmer switch
on

1.0 or
less

1L

Motor
operation

Rear airflow mode
actuator

Temperature control
dial (rear side):
Moving towards
HOT

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-Rear airflow mode
actuator: 1L-G, 1N-F)



Rear airflow mode
actuator

Temperature control
dial (rear side):
Moving towards
COLD

1.0 or
less

1M

Motor
operation

Air intake actuator

REC switch:
Switched to
RECIRCULATE

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-air intake actuator:
1M-A, 10-C)



Air intake actuator

REC switch:
Switched to FRESH

1.0 or
less

1N

Motor
operation

Rear airflow mode
actuator

Temperature control
dial (rear side):
Moving towards
HOT

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-Rear airflow mode
actuator: 1L-G, 1N-F)



Rear airflow mode
actuator

Temperature control
dial (rear side):
Moving towards

B+

2008 Mazda CX-9 Grand Touring

2008 HVAC Control System (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:12:36 AM

Page 37

© 2005 Mitchell Repair Information Company, LLC.