Mazda CX-9 Grand Touring. Manual — part 431

Temperature control
dial (driver side):
Set temperature at
MAX HOT

1.0

mix actuator



Front climate control
unit: terminal voltage
(2B)

2G

Potentiometer
input

Passenger-side
front air mix
actuator

Temperature control
dial (passenger
side): Set
temperature at
MAX COLD

1.0



Wiring harness:
continuity, short circuit
(Front climate control
unit-passenger-side
front air mix actuator:
2G-E)



Passenger-side front
air mix actuator



Front climate control
unit: terminal voltage
(2B)

Temperature control
dial (passenger
side): Set
temperature at
MAX HOT

4.0

2H

Front
evaporator
temperature
sensor input

Front evaporator
temperature sensor

Compared with
temperature
detected by front
evaporator
temperature sensor

Refer to



Wiring harness:
continuity (Front
climate control unit--
front evaporator
temperature sensor:
2H-B, 2P-A)



Wiring harness: short
circuit (Front climate
control unit-front
evaporator temperature
sensor: 2H-B)



Front evaporator
temperature sensor

21

Ambient
temperature
sensor input

Ambient
temperature sensor

Compared with
temperature
detected by ambient
temperature sensor

Refer to



Wiring harness:
continuity (Front
climate control unit-
ambient temperature
sensor: 21-B, 2P-A)



Wiring harness: short
circuit (Front climate
control unit-ambient
temperature sensor:
21-B)



Ambient temperature
sensor



Wiring harness:
continuity (Front
climate control unit-
rear evaporator

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.

2J

Rear
evaporator
temperature
sensor input

Rear evaporator
temperature sensor

Compared with
temperature
detected by rear
evaporator
temperature sensor

Refer to

temperature sensor: 2J-
B, 2P-A)



Wiring harness: short
circuit (Front climate
control unit-rear
evaporator temperature
sensor: 2J-B)



Rear evaporator
temperature sensor

2K

Cabin
temperature
sensor input

Cabin temperature
sensor

Compared with
temperature
detected by cabin
temperature sensor

Refer to



Wiring harness:
continuity (Front
climate control unit-
cabin temperature
sensor: 2K-B, 2P-A)



Wiring harness: short
circuit (Front climate
control unit-cabin
temperature sensor:
2K-B)



Cabin temperature
sensor

2L

-

-

-

-

-

2M

Solar radiation
sensor(LH)
input

Solar radiation
sensor

Natural sunlight
shined directly on
the solar radiation
sensor

4.0



Wiring harness:
continuity (Front
climate control unit-
solar radiation sensor:
2M-C, 2B-A)



Front climate control
unit: terminal voltage
(2B)



Solar radiation sensor

Blocking light to
solar radiation
sensor

1.0 or
less

2N

Potentiometer
input

Rear air mix
actuator

Temperature control
dial (rear side): Set
temperature at
MAX COLD

1.3



Wiring harness:
continuity, short circuit
(Front climate control
unit-rear air mix
actuator: 2N-E)



Rear air mix actuator



Front climate control
unit: terminal voltage
(2B)

Temperature control
dial (rear side): Set
temperature at
MAX HOT

4.0

Natural sunlight
shined directly on
the solar radiation

4.0



Wiring harness:
continuity (Front
climate control unit-

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.

2O

Solar radiation
sensor (RH)
input

Solar radiation
sensor

sensor

solar radiation sensor:
20-B, 2B-A)



Front climate control
unit: terminal voltage
(2B)



Solar radiation sensor

Blocking light to
solar radiation
sensor

1.0 or
less

2P

Sensor ground



Driver-side
front air mix
actuator



Passenger-
side front air
mix actuator



Front
airflow
mode
actuator



Ambient
temperature
sensor



Cabin
temperature
sensor



Front
evaporator
temperature
sensor



Rear air mix
actuator



Rear airflow
mode
actuator



Rear
evaporator
temperature
sensor

Under any
condition: Inspect
for continuity to
ground

1.0 or

less



Front climate control
unit: terminal voltage
(1X)

3A

-

-

-

-

-

3B

-

-

-

-

-

Rear climate

Rear climate

Rear control switch
on

B+



Wiring harness:
continuity (Front
climate control unit-
rear climate control
unit: 3C-F)



Wiring harness: short

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.

3C

control unit
display

control unit

Rear control switch
off

1.0 or
less

circuit (Front climate
control unit-rear
climate control unit:
3C-F)



Front climate control
unit: terminal voltage
(1W, 1X)

3D

TNS signal

TNS relay

Turn the headlight
switch to the off
position

1.0 or

less



Wiring harness: short
circuit (Front climate
control unit-TNS relay
(main fuse block): 3D-
D)



ILLUMI 10 A fuse



TNS relay



Headlight switch

Turn the headlight
switch to the TNS
position

B+



Wiring harness:
continuity, short circuit
(Front climate control
unit-TNS relay (main
fuse block): 3D-D)



ILLUMI 10 A fuse



TNS relay



Headlight switch

3E

Rear fan
control volume

Rear climate
control unit

Airflow
volume
control dial

Off

1.0 or

less



Front climate control
unit: terminal voltage
(1T)



Wiring harness:
continuity, short circuit
(Front climate control
unit-rear climate
control unit: 3E-A)



Rear climate control
unit

1st.

Approx.
1.3

Max
HI

Approx.

4.0

3F

TNS signal

Rear climate
control unit

Turn the headlight
switch to the off
position

1.0 or

less



Wiring harness:
continuity, short circuit
(Front climate control
unit-rear climate
control unit: 3F-H)



TNS relay



Headlight switch

Turn the headlight
switch to the TNS
position

B+

Temperature control
dial (rear side):

1.0 or



Wiring harness:

2008 Mazda CX-9 Grand Touring

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

Microsoft

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

Page 45

© 2005 Mitchell Repair Information Company, LLC.