Mazda CX-9 Grand Touring. Manual - part 425

10. Selector lever component (See SELECTOR LEVER COMPONENT 

REMOVAL/INSTALLATION .)  

3. Remove in the order indicated in the table.  

4. Install in the reverse order of removal. 

Fig. 29: Identifying Rear Blower Motor Removal Order 
Courtesy of MAZDA MOTORS CORP. 

REAR BLOWER MOTOR INSPECTION 

1. Connect battery positive voltage to rear blower motor terminal B, connect terminal A to ground, and then 

verify its operation. 



If there is any malfunction, replace the rear blower motor. 

Fig. 30: Inspecting Rear Blower Motor 
Courtesy of MAZDA MOTORS CORP. 

FRONT POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT 
TRANSISTOR (POWER MOS FET) REMOVAL/INSTALLATION 

1. Disconnect the negative battery cable.  

2. Remove the dashboard under cover, (passenger side) (See DASHBOARD UNDER COVER 

REMOVAL/INSTALLATION .)  

3. Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)  

4. Insert a flathead screwdriver as shown in the figure and detach the fuse block tab by prying it in the 

direction of the arrow.  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

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5. Press the fuse block and remove it from the bracket.  

6. Set the fuse block out of the way. 

Fig. 31: Detaching Fuse Block Tab 
Courtesy of MAZDA MOTORS CORP. 

7. Remove in the order indicated in the table.  

8. Install in the reverse order of removal. 

Fig. 32: Front Power Metal Oxide Semiconductor Field Effect Transistor (Power Mos Fet) Removal 
Order 
Courtesy of MAZDA MOTORS CORP. 

FRONT POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT 
TRANSISTOR (POWER MOS FET) INSPECTION 

1. Verify that the continuity between the front power MOS FET terminals is as indicated in the table. 



If there is any malfunction, replace the front power MOS FET.  



If the blower motor operation is not normal even though no malfunction can be verified, inspect the 
front climate control unit.  

FRONT POWER MOS FET TERMINALS CONTINUITY CHART 

Tester lead

Resistance (kilohm)

+

-

A

B

2.2

 

2008 Mazda CX-9 Grand Touring 

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

  

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Fig. 33: Inspecting Front Power Metal Oxide Semiconductor Field Effect Transistor (Power Mos 
Fet) 
Courtesy of MAZDA MOTORS CORP. 

REAR POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT 
TRANSISTOR (POWER MOS FET) REMOVAL/INSTALLATION 

1. Disconnect the negative battery cable.  

2. Remove the following parts: 

1. Decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)  

2. Front console box mat (See FRONT CONSOLE BOX MAT REMOVAL/INSTALLATION .)  

3. Indicator panel (See INDICATOR PANEL REMOVAL/INSTALLATION .)  

4. Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION .)  

5. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .) 

6. Side wall (See SIDE WALL REMOVAL/INSTALLATION .)  

7. Console panel (See CONSOLE PANEL REMOVAL/INSTALLATION .)  

8. Console cover (See CONSOLE COVER REMOVAL/INSTALLATION .)  

9. Console (See CONSOLE REMOVAL/INSTALLATION .)  

3. Remove in the order indicated in the table.  

4. Install in the reverse order of removal. 

A

E

Continuity detected

A

F

Continuity detected

B

A

2.2

B

E

Continuity detected

B

F

Continuity detected

E

A

infinity

E

B

infinity

E

F

11

F

A

infinity

F

B

infinity

F

E

11

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:12:35 AM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 34: Identifying Rear Power Metal Oxide Semiconductor Field Effect Transistor (Power Mos 
Fet) Removal Order 
Courtesy of MAZDA MOTORS CORP. 

REAR POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT 
TRANSISTOR (POWER MOS FET) INSPECTION 

1. Verify that the continuity between the rear power MOS FET terminals is as indicated in the table. 



If there is any malfunction, replace the rear power MOS FET.  



If the blower motor operation is not normal even though no malfunction can be verified, inspect the 
front climate control unit.  

REAR POWER MOS FET TERMINALS CONTINUITY CHART 

Tester lead

Resistance (kilohm)

+

-

A

B

infinity

A

C

11

A

D

infinity

B

A

Continuity detected

B

C

Continuity detected

B

D

1.5

C

A

11

C

B

infinity

C

D

infinity

D

A

Continuity detected

D

B

1.5

D

C

Continuity detected

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:12:35 AM

Page 21 

© 2005 Mitchell Repair Information Company, LLC.