Mazda CX-9 Grand Touring. Manual - part 440

 

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Mazda CX-9 Grand Touring. Manual - part 440

 

 

NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS 

NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS DESCRIPTION AND POSSIBLE 
CAUSE
 

DIAGNOSTIC PROCEDURE 

*11

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

Turn the ignition switch to the ON position  

Measure the voltage at the following front climate 
control unit terminals. 

Terminal 10 (RECIRCULATE signal)  

Terminal 1M (FRESH signal)  

Is the voltage approx. 12 V?  

Yes

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

No

Replace the front climate control 

unit, then go to Step 14.

12

INSPECT A/C UNIT AIR INTAKE DOOR  

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

Yes

Remove obstruction, then go to 
Step 14.

No

Go to the next step.

13

VERIFY THAT A/C UNIT AIR INTAKE DOOR IS 
POSITIONED SECURELY AND PROPERLY
  

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

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.

14

VERFY REPAIR  

Does the malfunction disappear?  

Yes

Troubleshooting completed. 
Explain repairs to customer.

No

Recheck malfunction symptoms, 

then repeat from Step 1 if the 

malfunction recurs.

6

Insufficient air (or no air) from rear vents

DESCRIPTION 

Problem with each rear vent and/or duct  

Rear airflow mode does not change when front and/or rear climate control 
unit mode switches.  

POSSIBLE 

CAUSE 

Rear vent mode malfunction  

Rear heat mode malfunction  

Rear airflow mode actuator malfunction  

Open, short circuit in wiring or poor connection between front and rear 
climate control unit  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:14:50 AM

Page 16 

© 2005 Mitchell Repair Information Company, LLC. 

NO.6 INSUFFICIENT AIR (OR NO AIR) BLOWN REAR VENTS DIAGNOSTIC PROCEDURE

STEP

INSPECTION

ACTION

1

INSPECT TO SEE WHETHER MALFUNCTION IS IN 
VENT MODE
  

Does air blow out when in the rear vent mode?  

Yes Go to the Step 6.

No

Go to the next step.

2

VERIFY THAT REAR HEATER CONTROL USING 
FRONT CLIMATE CONTROL UNIT
  

Turn the rear heater to ON and OFF using the front A/C 
control panel.  

Is it possible that the rear heater turns ON and OFF using 
the front climate control unit?  

Yes Go to Step 4.

No

Go to the next step.

3

INSPECT TO SEE WHETHER MALFUNCTION IS IN 
WIRING HARNESS (OPEN, SHORT OR POOR 
CONNECTION OF TERMINALS BETWEEN FRONT 
AND REAR CLIMATE CONTROL UNIT) OR 
ELSEWHERE
  

Inspect for open, short or poor connection of terminals 
between front and rear climate control unit. 

Terminal 3E (front)-terminal A (rear)  

Terminal 3G (front)-terminal C (rear)  

Terminal 3H (front)-terminal D (rear)  

Terminal 31 (front)-terminal E (rear)  

Terminal 3C (front)-terminal F (rear)  

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

Yes

Repair or replace 
malfunctioning part, then go 
to Step 10.

No

Go to the next step.

4

INSPECT VENT  

Is the vent clogged?  

Yes

Remove obstruction, then go 
to Step 10.

No

Go to the next step.

5

VERIFY THAT REAR A/C DUCT IS INSTALLED  

Is the rear A/C duct properly installed?  

Yes

Inspect the duct for 
clogging, deformation and 
air leakage, then go to Step 
10.

No

Install the duct securely in 

the proper position, then go 

to Step 10.

6

INSPECT TO SEE WHETHER MALFUNCTION IS IN 
REAR HEAT MODE
  

Does air blow out when in the rear heat mode?  

Yes Go to the next step.

No

Inspect the rear vent for 

clogging, then go to Step 10.

7

INSPECT REAR VENT  

Is the rear vent clogged?  

Yes

Remove obstruction, then go 
to Step 10.

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 10:14:51 AM

Page 17 

© 2005 Mitchell Repair Information Company, LLC. 

NO.7 AMOUNT OF AIR FROM REAR VENTS DOES NOT CHANGE 

NO.7 AMOUNT OF AIR FROM REAR VENTS DOES NOT CHANGE DESCRIPTION AND 
POSSIBLE CAUSE
 

8

INSPECT REAR MODE ACTUATOR  

(See REAR AIRFLOW MODE ACTUATOR 
INSPECTION
 .)  

Is the rear airflow mode actuator normal?  

Yes Go to the next step.

No

Replace the rear airflow 

mode actuator, then go to 

Step 10.

9

INSPECT TO SEE WHETHER MALFUNCTION IS IN 
WIRING HARNESS (OPEN, SHORT OR POOR 
CONNECTION OF TERMINALS BETWEEN FRONT 
AND REAR AIRFLOW MODE ACTUATOR) OR 
ELSEWHERE
  

Inspect for open, short or poor connection of terminals 
between front and rear airflow mode actuator. 

Terminal 2P (front climate control unit)- terminal C 
(rear airflow mode actuator)  

Terminal 2B (front climate control unit)- terminal A 
(rear airflow mode actuator)  

Terminal 2D (front climate control unit)- terminal E 
(rear airflow mode actuator)  

Terminal 1N (front climate control unit)- terminal F 
(rear airflow mode actuator)  

Terminal 1L (front climate control unit)- terminal G 
(rear airflow mode actuator)  

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

Yes

Repair or replace 
malfunctioning part, then go 
to next step.

No

Replace the front climate 

control unit, go to the next 

step.

10

VERIFY REPAIR  

Does air blow from the rear A/C vent mode?  

Yes

Troubleshooting completed.
Explain repairs to customer.

No

Recheck malfunction 

symptoms, then repeat from 

Step 1 if the malfunction 

recurs.

7

Amount of air from rear vents does not change

DESCRIPTION 

Malfunction in rear blower motor system  

Amount of air blowing rear vents does not change when switching front and/or 
rear climate control unit airflow volume control dial.  

POSSIBLE 

CAUSE 

Rear A/C unit malfunction  

Rear blower motor malfunction  

Rear power MOS FET malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:14:51 AM

Page 18 

© 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.7 AMOUNT OF AIR FROM REAR VENTS DOES NOT CHANGE DIAGNOSTIC PROCEDURE 

Rear climate control unit malfunction  

STEP

INSPECTION

ACTION

1

INSPECT TO SEE WHETHER MALFUNCTION 
IS IN REAR A/C UNIT OR ELSEWHERE
  

Turn the ignition switch to the ON position.  

Turn the rear fan switch the ON position.  

Does the blower motor rotate smoothly?  

Yes Go to the next step.

No

Go to Step 3.

2

INSPECT REAR A/C UNIT INTAKE VENT  

Is the rear A/C unit intake vent clogged?  

Yes

Remove obstruction, then go to Step 
13.

No

Inspect if there are any obstructions 

in the rear A/C unit passage, then go 

to Step 13.

3*

INSPECT TO SEE WHETHER MALFUNCTION 
IS IN REAR BLOWER RELAY SYSTEM OR 
REAR POWER MOS FET
  

Turn the ignition switch to ON position.  

Turn the rear fan switch to OFF position.  

Measure the voltage at the following rear blower 
motor terminal. 

Terminal B (rear blower motor operation 
signal)  

Is the voltage normal (B+)?  

Yes Go to the Step 7.

No

Go to the next step.

4*

INSPECT TO SEE WHETHER MALFUNCTION 
IS IN WIRING HARNESS (OPEN OR SHORT 
CIRCUIT BETWEEN FUSE BLOCK AND REAR 
BLOWER RELAY) OR ELSEWHERE
  

Measure the voltage at the following rear relay 
terminals. 

Terminal A (IG2 signal)  

Terminal D (B+ signal)  

Is the voltage approx. 12 V?  

Yes Go to the next step.

No

If the terminal A voltage is not 

normal, repair or replace wiring 

harness between A/C 7.5 A fuse and 

rear blower relay. 

If the terminal D voltage is not 

normal, repair or replace wiring 

harness between R.HEATER 40 A 

fuse and rear blower relay. Then go 

to Step 13.

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:14:51 AM

Page 19 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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