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

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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.