Mazda CX-9 Grand Touring. Manual - part 533

DIAGNOSTIC PROCEDURE 

DTC B1311 - DIAGNOSTIC PROCEDURE 

POSSIBLE CAUSE 

door latch and lock actuator (passenger-side) terminal 2A  



Open circuit in wiring harness between PLG control module terminal 3C and front 
door latch and lock actuator (passenger-side) terminal 2B  



Open circuit in wiring harness between front door latch and lock actuator 
(passenger-side) terminal 2B and body GND  



Door lock-link switch front door latch and lock actuator (passenger-side) 
malfunction  



PLG control module malfunction  

STEP

INSPECTION

ACTION

1

INSPECT DOOR LOCK-LINK SWITCH  



Disconnect the door lock-link switch 
(Passenger side) connector.  



Inspect the door lock-link switch 
(Passenger side). 

Yes Go to the next step.

No

Replace the front door latch and lock actuator.

(See FRONT DOOR LATCH AND LOCK 

ACTUATOR 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 8 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B1318 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B1318 - DETECTION CONDITION POSSIBLE CAUSE CHART 

(See FRONT DOOR LATCH AND 
LOCK ACTUATOR INSPECTION .) 



Is the door lock-link switch normal?  

REMOVAL/INSTALLATION .) 

Go to Step 3.

2

INSPECT THE FOLLOWING WIRING 
HARNESSES  



Disconnect the PLG control module 
connector.  



Disconnect the door lock-link switch 
(Passenger side) connector.  



Inspect the wiring harness between PLG 
control module terminal 3N and front 
door latch and lock actuator terminal 2A 
for an open circuit.  



Inspect the wiring harness between PLG 
control module terminal 3C and front 
door latch and lock actuator terminal 2B 
for an open circuit.  



Inspect the wiring harness between front 
door latch and lock actuator terminal 2E 
and body ground for an open circuit.  



Are the wiring harnesses normal?  

Yes Go to the next step.

No

Repair or replace the wiring harness. 

Go to the next step.

3

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Is DTC B1311 displayed after 10 s or 
more have elapsed.  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) 
CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B1318

Power supply voltage decreases

DETECTION 

CONDITION 

Input voltage from the battery is excessively low (below 10.5 V)

POSSIBLE CAUSE 



PLG 20 A fuse malfunction  



Open or short circuit in wiring harness between PLG control module terminal 
1C and battery  



Battery malfunction  



Generator malfunction  



PLG control module malfunction  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC B1318 - DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

1

INSPECT BATTERY VOLTAGE  



Inspect the battery voltage. 

(See BATTERY INSPECTION [MZI-
3.7] .) 



Is the battery voltage normal?  

Yes Go to the next step.

No

Recharge or replace the battery. 

Go to Step 4.

2

INSPECT FOR PCM DTCs  



Connect the M-MDS to the DLC-2.  



Are any DTCs for the PCM displayed?  

Yes

Perform troubleshooting according to the 
corresponding DTC inspection. 
Go to Step 4.

No

Go to the next step.

INSPECT THE FOLLOWING WIRING 
HARNESSES  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 10 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B1342 [POWER LIFTGATE (PLG) SYSTEM] 

DTC B1342 - DETECTION CONDITION POSSIBLE CAUSE CHART 

DIAGNOSTIC PROCEDURE 

DTC B1342 - DIAGNOSTIC PROCEDURE 

DTC B241A [POWER LIFTGATE (PLG) SYSTEM] 

DTC B241A - DETECTION CONDITION POSSIBLE CAUSE CHART 

3



Disconnect the negative battery cable.  



Disconnect the positive battery cable.  



Disconnect the PLG control module 
connector.  



Inspect the wiring harness between PLG 
control module terminal 1C (wiring 
harness-side) and positive battery terminal 
(wiring harness-side) for an open 
circuit/short circuit to ground system.  



Is the wiring harness normal?  

Yes

Repair or replace the wiring harness. 
Go to the next step.

No

Go to the next step.

4

VERIFY CORRECTION COMPLETED  



Reconnect the disconnected connector.  



Clear the DTC.  



Operate the PLG system.  



Is DTC B1318 stored?  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) 
CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B1342

PLG control module internal malfunction

DETECTION CONDITION  Malfunction in the PLG control module internal circuit

POSSIBLE CAUSE 



Malfunction in the PLG control module internal circuit  

STEP

INSPECTION

ACTION

1

VERIFY DTC  



Clear the DTC.  



Operate the PLG 
system.  



Is DTC B1342 
stored?  

Yes

Replace the PLG control module. 
(See POWER LIFTGATE (PLG) CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

DTC B241A

Touch sensor circuit malfunction

DETECTION 

A short circuit to ground in the PLG touch sensor (RH/LH) continues for 5 min or 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES On-Board Diagnostic (Power Liftgate (PLG) System) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:46:08 AM

Page 11 

© 2005 Mitchell Repair Information Company, LLC.