Mazda CX-9 Grand Touring. Manual - part 161

6. Remove the PLG drive unit.  

7. Install in the reverse order of removal. 

Fig. 16: View Of PLG Drive Unit Connector & Torque Specifications 
Courtesy of MAZDA MOTORS CORP. 

POWER LIFTGATE (PLG) CONTROL MODULE REMOVAL/INSTALLATION 

1. Disconnect the negative battery cable.  

2. Remove the following parts: 

1. Trunk box (See TRUNK BOX REMOVAL/INSTALLATION .)  

2. Seat side box (LH) (See SEAT SIDE BOX REMOVAL/INSTALLATION .)  

3. Trunk end trim (See TRUNK END TRIM REMOVAL/INSTALLATION .)  

4. Third-row seat (See THIRD-ROW SEAT REMOVAL/INSTALLATION .)  

5. Third-row seat belt lower anchor installation bolt (LH) (See THIRD-ROW SEAT BELT 

REMOVAL/INSTALLATION .)  

6. Trunk side trim (LH) (See TRUNK SIDE TRIM REMOVAL/INSTALLATION .)  

3. Disconnect the PLG control module connector.  

4. Remove the bolts.  

5. Remove the PLG control module.  

6. Install in the reverse order of removal. 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Doors and Liftgate - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:45:23 AM

Page 15 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 17: Identifying PLG Control Module, Connector & Torque Specifications 
Courtesy of MAZDA MOTORS CORP. 

POWER LIFTGATE (PLG) CONTROL MODULE INSPECTION 

1. Measure the PLG control module terminal voltage.  

2. If there is large difference between the measured value and the value in the terminal voltage table, inspect 

the parts under "Inspection item(s)" and related wiring harnesses. 



If the system does not work properly even though the inspection items or related wiring harnesses 
do not have any malfunction, replace the PLG control module.  

Terminal Voltage Table (Reference)  

Fig. 18: Identifying PLG Control Module Connector Terminal 
Courtesy of MAZDA MOTORS CORP. 

CONNECTOR TERMINAL REFERENCE 

Terminal

Signal 

name

Connected to Measurement condition

Voltage (V)/ 

Continuity

Inspection item(s)

Closure 

After opening the liftgate, 



Liftgate latch 
and lock 
actuator 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Doors and Liftgate - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:45:23 AM

Page 16 

© 2005 Mitchell Repair Information Company, LLC. 

1A

motor 
(Closed)

Closure motor

operate the closure motor 
with the liftgate half-
closed

0 --> B+ --> 0



Latch 
position 
switch  



Closure 
motor  

1B

Closure 
motor 
(Open)

Closure motor

Open the fully closed 
liftgate by hand

0 --> B+ --> 0



Liftgate latch 
and lock 
actuator 



Latch 
position 
switch  



Closure 
motor  



Liftgate outer 
handle switch  

1C

Power 
supply

PLG 20 A fuse Under any condition

B+

PLG 20 A fuse

1D

GND

Body ground

Under any condition

1.0 or less



Related wiring 
harnesses  

1E

PLG motor 
(Open)

PLG motor

Open the fully closed 
liftgate

0 --> B+ --> 0 PLG drive unit

1F

PLG motor 
(Closed)

PLG motor

Close the fully opened 
liftgate

0 --> B+ --> 0 PLG drive unit

2A

IG1

METER 10 A 
fuse

Ignition switch is at ON 
position

B+

METER 10 A fuse

Ignition switch is at LOCK 
or ACC position

1.0 or less

2B

PLG rear 
switch 
signal

PLG rear 
switch

When operating the PLG 
rear switch

B+

PLG rear switch

When not operating the 
PLG rear switch

1.0 or less

2C

PLG buzzer 
output

PLG buzzer

When the PLG buzzer is 
sounding

B+

PLG buzzer

Other

1.0 or less

2D

PLG touch 
sensor GND

Body ground

Under any condition

1.0 or less



Related wiring 
harnesses  

2G

Clutch 
output (-)

PLG clutch

When PLG is open or 
closing

1.0 or less

PLG drive unit

Other

No Continuity

2I

Clutch 
output (+)

PLG clutch

When PLG is open or 
closing

B+

PLG drive unit

Other

1.0 or less

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Doors and Liftgate - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:45:23 AM

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© 2005 Mitchell Repair Information Company, LLC. 

2J

PLG motor 
rotation 
signal A

Rotation 
sensor

Pulse signal

-

PLG drive unit

2K

Rotation 
signal power 
source

Rotation 
sensor

Under any condition

5

PLG drive unit

2L

PLG motor 
rotation 
signal B

Rotation 
sensor

Pulse signal

-

PLG drive unit

2N

Rotation 
sensor GND

Body ground

Under any condition

1.0 or less



Related wiring 
harnesses  

2O

Power 
supply

BCM

Under any condition

B+

BCM

3A

PLG touch 
sensor 
signal (RH)

PLG touch 
sensor (RH)

When sensor is operating 
normally (usually)

0.5-4.2 or less

PLG touch sensor 
(RH)

When sensor is at fault

Other than 
those above

3B

PLG touch 
sensor 
signal (LH)

PLG touch 
sensor (LH)

When sensor is operating 
normally (usually)

0.5-4.2 or less

PLG touch sensor 
(LH)

When sensor is at fault

Other than 
those above

3C

Lock signal

Passenger seat 
side lock link 
switch

Passenger seat side door is 
locked. Check the 
continuity with earth

Continuity

Passenger seat side 
lock link switch

Passenger seat side door is 
unlocked. Check the 
continuity with earth

No Continuity

3E

Motor return 
signal

Return switch

After opening the liftgate, 
operate the closure motor 
with the liftgate half-
closed

1.0 or less



Liftgate latch 
and lock 
actuator 



Return 
switch  

3F

Liftgate 
latch switch 
signal

Liftgate latch 
switch

Liftgate is open (liftgate 
latch switch is ON)

1.0 or less

Liftgate latch and lock 
actuator

Liftgate is closed (liftgate 
latch switch is OFF)

B+

3G

Full latch 
switch

Latch position 
switch

After opening the liftgate, 
operate the closure motor 
with the liftgate half-
closed

1.0 or less --> 

B+ --> 1.0 or 

less



Liftgate latch 
and lock 
actuator 



Latch 
position 
switch  



Closure 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Doors and Liftgate - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:45:23 AM

Page 18 

© 2005 Mitchell Repair Information Company, LLC.