Mazda CX-9 Grand Touring. Manual - part 10

DTC B104D, B2226, B2227, B2855



Remove the B-pillar lower trim. (See B-
PILLAR LOWER TRIM 
REMOVAL/INSTALLATION .)  



Disconnect the driver and passenger-side pre-
tensioner seat belt connectors. (See FRONT 
SEAT BELT 
REMOVAL/INSTALLATION .)  



Disconnect the SAS control module connectors. 
(See SAS CONTROL MODULE 
REMOVAL/INSTALLATION .)  



Disconnect the passenger-side side air bag 
sensor No.1 connector.  



Inspect the wiring harnesses between SAS 
control module terminal 2K and passenger-side 
side air bag sensor No.1 terminal A, SAS 
control module terminal 2G and passenger-side 
side air bag sensor No.1 terminal B for the 
following: 



Short to ground  



Short to power supply  



Open circuit  



Is the wiring harness normal?  

No

Replace the air bag wiring harness.

3

INSPECT SAS CONTROL MODULE  



Connect the SAS control module connector.  



Connect the driver and passenger-side pre-
tensioner seat belt connectors.  



Connect the passenger-side side air bag sensor 
No.1 connector.  



Connect the driver and passenger-side curtain 
air bag module connectors.  



Connect the driver and passenger-side front seat 
connectors.  



Connect the passenger-side air bag module 
connector.  



Connect the clock spring connector.  



Connect the negative battery cable.  



Turn the ignition switch to the ON position.  



Are DTCs B104C, B104F, B1050 and/or U2018 
indicated?  

Yes

Replace the SAS control module. (See 
SAS CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

 

2008 Mazda CX-9 Grand Touring 

2008 RESTRAINTS On-Board Diagnostic (Restraints) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:18:46 AM

Page 37 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B104D, B2226, B2227, B2855 DETECTION CONDITION AND POSSIBLE CAUSE

DIAGNOSTIC PROCEDURE 

DTC B104D, B2226, B2227, B2855 DIAGNOSTIC PROCEDURE 

DTC

B104D Crash zone sensor and other sensor circuits short to power supply

B2226

Crash zone sensor (internal circuit abnormal)

B2227

Crash zone sensor (communication error)

B2855

Crash zone sensor circuit short

DETECTION 

CONDITION 



Malfunction in wiring harness between crash zone sensor and SAS control module  



Malfunction in crash zone sensor circuit  

WARNING:



Detection conditions are for understanding the DTC outline before performing an 
inspection. Performing an inspection according to only the detection conditions 
may cause injury due to an operating error, or damage the system. When 
performing an inspection, always follow the inspection procedure.  

POSSIBLE 

CAUSE 



Open or short circuit in wiring harness between crash zone sensor and SAS control 

module  



Crash zone sensor malfunction  



SAS control module malfunction  

STEP

INSPECTION

ACTION

INSPECT CRASH ZONE SENSOR 
CONNECTOR 

 

2008 Mazda CX-9 Grand Touring 

2008 RESTRAINTS On-Board Diagnostic (Restraints) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:18:46 AM

Page 38 

© 2005 Mitchell Repair Information Company, LLC. 

1

 



Turn the ignition switch to the LOCK position.  



Disconnect the negative battery cable and wait 
for 1 min or more.  



Disconnect the crash zone sensor connector. 
(See CRASH ZONE SENSOR 
REMOVAL/INSTALLATION .)  



Is there any malfunction of the crash zone 
sensor connector?  

WARNING:



Handling the air bag system components 
improperly can accidentally deploy the air 
bag modules and pre-tensioner seat belts, 
which may seriously injure you. Read the 
service warnings and cautions before 
handling the air bag system components. 

(See AIR BAG SYSTEM SERVICE 
WARNINGS .) 

(See AIR BAG SYSTEM SERVICE 
CAUTIONS .) 

Yes Replace the air bag wiring harness.

No

Go to the next step.

INSPECT WIRING HARNESS BETWEEN 
CRASH ZONE SENSOR AND SAS CONTROL 
MODULE  



Turn the ignition switch to the LOCK position.  



Disconnect the negative battery cable and wait 
for 1 min or more.  



Remove the column cover. (See COLUMN 
COVER REMOVAL/INSTALLATION .)  



Disconnect the clock spring connector. (See 
COMBINATION SWITCH 
REMOVAL/INSTALLATION .)  



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



Disconnect the passenger-side air bag module 
connector. (See PASSENGER-SIDE AIR 
BAG MODULE 
REMOVAL/INSTALLATION .)  



Disconnect the driver and passenger-side front 
seat connectors. (See FRONT SEAT 
REMOVAL/INSTALLATION .)  

Yes

Replace the crash zone sensor, then go 
to the next step. 
(See CRASH ZONE SENSOR 
REMOVAL/INSTALLATION .)

 

2008 Mazda CX-9 Grand Touring 

2008 RESTRAINTS On-Board Diagnostic (Restraints) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:18:46 AM

Page 39 

© 2005 Mitchell Repair Information Company, LLC. 

DTC B1054, B1877, B1878, B1879, B1885

2



Disconnect the driver and passenger-side curtain 
air bag module connectors. (See CURTAIN 
AIR BAG MODULE 
REMOVAL/INSTALLATION .)  



Remove the B-pillar lower trim. (See B-
PILLAR LOWER TRIM 
REMOVAL/INSTALLATION .)  



Disconnect the driver and passenger-side pre-
tensioner seat belt connectors. (See FRONT 
SEAT BELT 
REMOVAL/INSTALLATION .)  



Disconnect the SAS control module connectors. 
(See SAS CONTROL MODULE 
REMOVAL/INSTALLATION .)  



Inspect the wiring harnesses between SAS 
control module terminal 1W and crash zone 
sensor terminal A, SAS control module terminal 
1S and crash zone sensor terminal B for the 
following: 



Short to ground  



Short to power supply  



Open circuit  



Is the wiring harness normal?  

No

Replace the air bag wiring harness.

3

INSPECT SAS CONTROL MODULE  



Connect the SAS control module connector.  



Connect the driver and passenger-side pre-
tensioner seat belt connectors.  



Connect the driver and passenger-side curtain 
air bag module connectors.  



Connect the driver and passenger-side front seat 
connectors.  



Connect the passenger-side air bag module 
connector.  



Connect the clock spring connector.  



Connect the crash zone sensor connector.  



Connect the negative battery cable.  



Turn the ignition switch to the ON position.  



Is DTC B104D, B2226, B2227 and/or B2855 
indicated?  

Yes

Replace the SAS control module. (See 
SAS CONTROL MODULE 
REMOVAL/INSTALLATION .)

No

DTC troubleshooting completed.

 

2008 Mazda CX-9 Grand Touring 

2008 RESTRAINTS On-Board Diagnostic (Restraints) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:18:46 AM

Page 40 

© 2005 Mitchell Repair Information Company, LLC.