Mazda CX-9 Grand Touring. Manual — part 11

DTC B1054, B1877, B1878, B1879, B1885 DETECTION CONDITION AND POSSIBLE CAUSE

DIAGNOSTIC PROCEDURE

DTC B1054, B1877, B1878, B1879, B1885 DIAGNOSTIC PROCEDURE

DTC

B1054 Driver-side pre-tensioner seat belt and other air bag module circuits short
B1877 Driver-side pre-tensioner seat belt circuit resistance high
B1878 Driver-side pre-tensioner seat belt circuit short to power supply
B1879 Driver-side pre-tensioner seat belt circuit short to body ground
B1885 Driver-side pre-tensioner seat belt circuit resistance low

DETECTION

CONDITION



Resistance other than 1.0-9.7 ohms detected in driver-side pre-tensioner seat belt
circuit



Malfunction in the wiring harness between driver-side pre-tensioner seat belt and SAS
control module

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 driver-side pre-tensioner seat belt and
SAS control module



Driver-side pre-tensioner seat belt malfunction



SAS control module malfunction

STEP

INSPECTION

ACTION

INSPECT DRIVER-SIDE PRE-TENSIONER
SEAT BELT

2008 Mazda CX-9 Grand Touring

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

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1



Using the M-MDS, verify the following
PID/DATA monitor.

(See PID/DATA MONITOR TABLE.)



RES_PT_D



Is the resistance of the driver-side pre-tensioner
seat belt normal?



Resistance: 1.0-9.7 ohms

Yes

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

No

Go to the next step.

2

INSPECT DRIVER-SIDE PRE-TENSIONER
SEAT BELT CONNECTOR



Turn the ignition switch to the LOCK position.



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



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



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



Is there any malfunction of the driver-side pre-
tensioner seat belt 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.

VERIFY WHETHER MALFUNCTION IS IN
DRIVER-SIDE PRE-TENSIONER SEAT BELT
OR RELATED WIRING HARNESS



Connect the leads of the SST (Fuel and
thermometer checker) or apply 2-ohm resistance
to driver-side pre-tensioner seat belt connector

Yes Go to the next step.

2008 Mazda CX-9 Grand Touring

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

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Sunday, November 15, 2009 10:18:46 AM

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3

terminals A and B.



Set the resistance of the SST (Fuel and
thermometer checker) to the 2-ohm position.



Connect the negative battery cable.



Turn the ignition switch to the ON position.



Are DTCs B1054, B1877, B1878, B1879,
and/or B1885 indicated?

No

Replace the driver-side pre-tensioner

seat belt.

(See FRONT SEAT BELT

REMOVAL/INSTALLATION .)

4

INSPECT WIRING HARNESS BETWEEN
DRIVER-SIDE PRE-TENSIONER SEAT BELT
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 .)



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 .)

Yes

Replace the SAS control module. (See
SAS CONTROL MODULE
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 43

© 2005 Mitchell Repair Information Company, LLC.

DTC B1055, B1996, B1997, B1998, B1999

DTC B1055, B1996, B1997, B1998, B1999 DETECTION CONDITION AND POSSIBLE CAUSE



Inspect the wiring harness between SAS control
module terminal 2J and driver-side pre-tensioner
seat belt terminal A, SAS control module
terminal 2N and driver-side pre-tensioner seat
belt 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.

DTC

B1055 Passenger-side side air bag module and other air bag module circuits short
B1996 Passenger-side side air bag module circuit short to power supply
B1997 Passenger-side side air bag module circuit short to body ground
B1998 Passenger-side side air bag module circuit resistance high
B1999 Passenger-side side air bag module circuit resistance low

DETECTION

CONDITION



Resistance other than 1.0-9.7 ohms detected in passenger-side side air bag module
circuit



Malfunction in wiring harness between passenger-side side air bag module and SAS
control module

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 passenger-side side air bag module

and SAS control module



Passenger-side side air bag module malfunction



SAS control module malfunction

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 44

© 2005 Mitchell Repair Information Company, LLC.