Mazda CX-9 Grand Touring. Manual — part 439

2



Is there grease on links and cranks?



Are links, cranks, and rods securely
installed in their proper positions?



Is wire clamp free of deformation?



Are the above items normal?

No

Apply grease or install the links, cranks, and

rods securely in their proper positions, repair

or replace the air intake actuator or wire

clamp, then go to Step 9.

3

VERIFY THAT AIR INTAKE WIRE FROM
A/C UNIT IS POSITIONED SECURELY
AND CORRECTLY (IF AVAILABLE)



Is the air intake wire securely installed in
the correct position in relation to the A/C
unit air intake links?

Yes Go to the next step.

No

Adjust the air intake wire or install securely

in the correct position, then go to Step 9.

4

INSPECT CLIMATE CONTROL UNIT



Is the climate control unit normal?

Yes Go to the next step.

No

Repair or replace the climate control unit,

then go to Step 9.

5

INSPECT A/C UNIT



Is there any foreign material or
obstruction in the A/C unit air intake
doors?

Yes Remove obstruction, then go to Step 9.

No

Go to the next step.

6

INSPECT A/C UNIT AIR INTAKE DOOR



Is the A/C unit air intake door securely
and properly installed?

Yes

Inspect the air intake door for cracks or
damage, then go to the next step.

No

Install the air intake door securely in the
proper position, then go to the next step.

7

INSPECT WIRING HANESS BETWEEN
CLIMATE CONTROL UNIT AND FRONT
AIR MIX ACTUATOR



Disconnect the front climate control unit
connector (24-pin, 16-pin).



Inspect following wiring harness and
connectors for open, short or poor
connection of terminals.



Between terminals 1A (climate
control unit) and G (driver-side
front air mix actuator)



Between terminals 1F (climate
control unit) and F (driver-side
front air mix actuator)



Between terminals 2F (climate
control unit) and E (driver-side
front air mix actuator)



Between terminals 1C (climate
control unit) and G (passenger-side

Yes

Repair or replace malfunctioning part, then
go to Step 9.

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:50 AM

Page 12

© 2005 Mitchell Repair Information Company, LLC.

NO.5 WINDSHIELD FOGGED

NO.5 WINDSHIELD FOGGED DESCRIPTION AND POSSIBLE CAUSE

front air mix actuator)



Between terminals 1E (climate
control unit) and F (passenger-side
front air mix actuator)



Between terminals 2G (climate
control unit) and E (passenger-side
front air mix actuator)



Is there any open, short or poor
connection of terminals?

No

Go to the next step.

8

INSPECT HEATER LINE



Inspect the heater lines.



Is the heater piping free of damage
and cracks?



Are the heater piping connections
free of engine coolant leakage?



Are the heater piping connections
securely tightened?



Are the heater piping installation
points on A/C unit free of engine
coolant leakage?



Are the above items normal?

Yes

Operation is normal. Recheck malfunction
symptoms.

No

If heater piping connections are loose,

tighten the connections to the specified

torque.

Repair or replace the heater piping, then go

to the next step.

9

VERIFY REPAIR



Does the unit operate in every temperature
setting?

Yes

Troubleshooting completed.
Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat

from Step 1 if the malfunction recurs.

5

Windshield fogged.

DESCRIPTION



Malfunction in A/C compressor control system and/or air intake mode
switching system



A/C compressor does not operate while airflow mode is DEFROSTER or
HEAT/DEF modes.



Air intake mode does not change to FRESH while airflow mode is in
DEFROSTER or HEAT/DEF modes.

POSSIBLE

CAUSE



Front climate control unit (B+ signal) system malfunction



Air intake actuator malfunction



Front climate control unit (RECIRCULATE, FRESH signal) system
malfunction



A/C unit air intake door malfunction

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:50 AM

Page 13

© 2005 Mitchell Repair Information Company, LLC.



When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors
while doing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, inspect to make sure connectors, terminals and wiring harness are
connected correctly and undamaged.

DIAGNOSTIC PROCEDURE

NO.5 WINDSHIELD FOGGED DIAGNOSTIC PROCEDURE

STEP

INSPECTION

ACTION

1

COOL AIR BLOW OUT INSPECTION



When both the A/C and fan switch in the front
climate control unit are on, does cool air blow out
from the front vent?

Yes Go to the next step.

No

Go to Step 1 of troubleshooting

index No.8.

2

INSPECT FRONT CLIMATE CONTROL UNIT
POWER SUPPLY FUSE FOR B+ SIGNAL



Is the front climate control unit power supply fuse
for B+ signal normal?

Yes Go to the next step.

No

Inspect for a short to ground on

blown fuse circuit.

Repair or replace if necessary.

Install appropriate amperage fuse.

3

INSPECT AIR INTAKE ACTUATOR



Inspect the air intake actuator for followings.



Is there grease on the link?



Is the link securely and properly positioned?



Is the link free of obstructions?



Are the above items normal?

Yes Go to the next step.

No

Apply grease or install the link

properly and securely, remove

obstruction, then go to Step 14.

*4

INSPECT WIRING HARNESS BETWEEN FUSE
BLOCK AND FRONT CLIMATE CONTROL UNIT
FOR CONTINUITY



Disconnect the front climate control unit connector
(24-pin).



Turn the ignition switch to the ON position.



Measure the voltage at front climate control unit
terminal 1B (B+ signal).



Is the voltage approx. 12 V?

Yes Go to the next step.

No

Repair the wiring harness between

the fuse block and front climate
control unit, then go to Step 14.

*5

INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND GROUND FOR
VOLTAGE



Measure the voltage at front climate control unit
terminal 1X (Ground).



Is the voltage approx. 0 V?

Yes Go to the next step.

No

Repair the wiring harness between

the front climate control unit and

ground, then go to Step 14.

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:50 AM

Page 14

© 2005 Mitchell Repair Information Company, LLC.

6

VERIFY WHETHER MALFUNCTION IS IN A/C
UNIT AIR INTAKE DOOR OR ELSEWHERE



Turn the ignition switch to the LOCK position.



Connect the climate control unit connector (24-
pin).



Remove the air intake actuator.



Turn the ignition switch to the ON position.



Set the fan switch to 4th position.



Does the air intake mode (RECIRCULATE,
FRESH) change smoothly when the air intake link
is operated by hand?

Yes Go to the next step.

No

Go to Step 12.

7

INSPECT AIR INTAKE ACTUATOR



Inspect the air intake actuator. (See AIR INTAKE
ACTUATOR INSPECTION .)



Is it normal?

Yes Go to the next step.

No

Replace the air intake actuator, go

to Step 14.

8

INSPECT AIR INTAKE SELECTOR SWITCH AND
DEFROSTER SWITCH IN FRONT CLIMATE
CONTROL UNIT



Measure the voltage at front climate control unit
connector (24-pin) terminals 1O and 1M.



Is it normal?

Yes Go to the next step.

No

Replace the front climate control

unit, then go to Step 14.

*9

INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR CONTINUITY



Turn the ignition switch to the LOCK position.



Is there continuity between the following front
climate control unit terminals and air intake
actuator terminals?



Terminal C - Terminal 10 (RECIRCULATE
signal)



Terminal A - Terminal 1M (FRESH signal)

Yes Go to the next step.

No

Repair the wiring harness between

the front climate control unit and air

intake actuator, then go to Step 14.

*10

INSPECT WIRING HARNESS BETWEEN FRONT
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO GROUND



Is there continuity between the following front
climate control unit terminals and ground?



Terminal 10 (RECIRCULATE signal)



Terminal 1M (FRESH signal)

Yes

Repair the wiring harness between
the front climate control unit and air
intake actuator, then go to Step 14.

No

Go to the next step.

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:50 AM

Page 15

© 2005 Mitchell Repair Information Company, LLC.