Mazda CX-9 Grand Touring. Manual - part 433

climate 
control 
unit-rear 
climate 
control 
unit: 3H-
D)  

E

Ground

Front climate 
control unit

Under any condition: Inspect 
for continuity to ground

1.0 or less



Wiring 
harness: 
continuity 
(Front 
climate 
control 
unit-rear 
climate 
control 
unit: 31-
E)  

F

Rear climate 
control unit 
display

Front climate 
control unit

Rear control switch on

B+



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

Rear control switch off

1.0 or less



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



Front 
climate 
control 
unit: 
terminal 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:12:36 AM

Page 50 

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voltage 
(1W, 1X)  

G

Panel light 
control input

Instrument 
cluster

Turn the headlight switch to 
the off position

1.0 or less



Wiring 
harness: 
continuity, 
short 
circuit 
(Rear 
climate 
control 
unit-
instrument 
cluster: G-
1I)  



TNS relay 



Headlight 
switch  

Turn the headlight switch to 
the TNS position

B+

H

TNS signal

Front 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+

I

-

-

-

-

-

J

-

-

-

-

-

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:12:36 AM

Page 51 

© 2005 Mitchell Repair Information Company, LLC. 

2008 HVAC

Refrigerant System - Mazda CX-9 

REFRIGERANT SYSTEM SERVICE WARNINGS 

HANDLING REFRIGERANT 



Avoid breathing air conditioning refrigerant or lubricant vapor. Exposure may irritate eyes, nose 
and throat. Also, due to environmental concerns, the use of recovery/recycling/recharging 
equipment is mandatory when draining R-134a from the air conditioning system. If accidental 
system discharge occurs, ventilate work area before resuming service.  



Do not perform pressure test or leak test for R-134a service equipment and/or vehicle air 
conditioning system using compressed air. Some mixtures of air and R-134a have been shown to be 
combustible at elevated pressures. These mixtures, if ignited, may cause injury or property 
damage. Additional health and safety information may be obtained from refrigerant 
manufacturers.  



Do not allow the refrigerant to leak near fire or any kind of heat. A poisonous gas may be generated 
if the refrigerant gas contacts fire or heat such as from cigarettes and heaters. When carrying out 
any operation that can cause refrigerant leakage, extinguish or remove the above-mentioned heat 
sources and maintain adequate ventilation.  



Handling liquid refrigerant is dangerous. A drop of it on the skin can result in localized frostbite. 
When handling the refrigerant, wear gloves and safety goggles. If refrigerant splashes into the eyes, 
immediately wash them with clean water and consult a doctor.  

STORING REFRIGERANT 



The refrigerant container is highly pressurized. If it is subjected to high heat, it could explode, 
scattering metal fragments and liquid refrigerant that can seriously injure you. Store the 
refrigerant at temperatures below 40 °C {104 °F}.  

REFRIGERANT SYSTEM SERVICE CAUTIONS 

HANDLING INSUFFICIENT REFRIGERANT LEVEL 



If an insufficient refrigerant level is detected at troubleshooting, do not charge (add) the 
refrigerant. Because an accurate amount of refrigerant cannot be determined from the pressure 
indicated on the manifold gauge, never charge the refrigerant. If there is too much or too little 
refrigerant from the refilling, there may be secondary problems such as damage to the refrigerant 
cycle parts, or a decrease of cooling performance. Therefore, if it is determined that the refrigerant 
level is insufficient, completely remove refrigerant from the refrigerant cycle and refill with 
refrigerant to the specified amount.  

HANDLING A/C RELATED PARTS 



There will be no effect on either performance or quality of A/C-related parts, including but not 

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Refrigerant System - Mazda CX-9

  

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Refrigerant System - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:13:14 AM

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© 2005 Mitchell Repair Information Company, LLC. 

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limited to the piping, etc., provided that said parts are serviced/repaired in accordance with 
standard procedure.  



When serviced/repaired A/C units in locations where there is a considerable risk of contamination 
from dirt or dust, plug up the openings on the parts to prevent dust/dirt from entering.  



When using adhesive material to cover openings on A/C parts, make sure that the adhesive side of 
the material does not come in contact with the connectors on the parts.  



When the system is opened to atmosphere, there is no need to replace the condenser, or the receiver 
dryer when it is housed within the condenser, provided that the unit is plugged accordingly.  

HANDLING COMPRESSOR OIL 



Use only DENSO OIL8 compressor oil for this vehicle. Using a PAG oil other than DENSO OIL8 
compressor oil can damage the A/C compressor.  



Do not spill DENSO OIL8 compressor oil on the vehicle. A drop of compressor oil on the vehicle 
surface can eat away at the paint. If oil gets on the vehicle, wipe it off immediately.  



DENSO OIL8 compressor oil (PAG oil) has a higher moisture absorption efficiency than the 
previously used mineral oil. If moisture mixes with the compressor oil, the refrigerant system could 
be damaged. Therefore, install caps immediately after using the compressor oil or removing 
refrigerant system parts to prevent moisture absorption. 

Fig. 1: DENSO OIL8 Compressor Oil Moisture Absorption Graph 
Courtesy of MAZDA MOTORS CORP. 

REFRIGERANT SYSTEM GENERAL PROCEDURES 

MANIFOLD GAUGE SET INSTALLATION 

1. Fully close the valves of the manifold gauge.  

2. Connect the charging hoses to the high and low-pressure side joints of the manifold gauge.  

3. Connect the quick couplers to the ends of the charging hoses.  

4. Connect the quick couplers to the charging valves. 

 

2008 Mazda CX-9 Grand Touring 

2008 HVAC Refrigerant System - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:13:14 AM

Page 2 

© 2005 Mitchell Repair Information Company, LLC.