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

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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.