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.