Mazda CX-9 Grand Touring. Manual — part 12

DIAGNOSTIC PROCEDURE

DTC B1055, B1996, B1997, B1998, B1999 DIAGNOSTIC PROCEDURE

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE SIDE AIR BAG
MODULE



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

(See PID/DATA MONITOR TABLE.)



RES_SAB_P



Is the resistance of the passenger-side side air
bag module 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.

INSPECT PASSENGER-SIDE SIDE AIR BAG
MODULE 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 .)

Yes Replace the air bag wiring harness.

2008 Mazda CX-9 Grand Touring

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

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2



Turn the ignition switch to the LOCK position.



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



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



Is there any malfunction of the passenger-side
side air bag module connector?

(See AIR BAG SYSTEM SERVICE
CAUTIONS .)

No

Go to the next step.

3

VERIFY WHETHER MALFUNCTION IS IN
PASSENGER-SIDE SIDE AIR BAG MODULE
OR RELATED WIRING HARNESS



Connect the leads of the SST (Fuel and
thermometer checker) or apply 2-ohm resistance
to passenger-side side air bag module connector
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 B1055, B1996, B1997, B1998 and/or
B1999 indicated?

Yes Go to the next step.

No

Replace the passenger-side side air bag

module.

(See SIDE AIR BAG SENSOR NO.

1 REMOVAL/INSTALLATION .)

INSPECT WIRING HARNESS BETWEEN
PASSENGER-SIDE SIDE AIR BAG MODULE
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

Replace the SAS control module. (See

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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© 2005 Mitchell Repair Information Company, LLC.

DTC B1056, B2777, B2778, B2779, B2780

DTC B1056, B2777, B2778, B2779, B2780 DETECTION CONDITION AND POSSIBLE CAUSE

4

connector. (See PASSENGER-SIDE AIR
BAG MODULE
REMOVAL/INSTALLATION .)



Disconnect the driver-side seat connector. (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 .)



Inspect the wiring harness between SAS control
module terminal 21 and passenger-side side air
bag module terminal A, SAS control module
terminal 2M and passenger-side side air bag
module terminal B for the following:



Short to ground



Short to power supply



Open circuit



Is the wiring harness normal?

Yes

SAS CONTROL MODULE
REMOVAL/INSTALLATION .)

No

Replace the air bag wiring harness.

DTC

B1056 Passenger-side curtain air bag module and other air bag module circuits short
B2777 Passenger-side curtain air bag module circuit resistance low
B2778 Passenger-side curtain air bag module circuit resistance high
B2779 Passenger-side curtain air bag module circuit short to body ground
B2780 Passenger-side curtain air bag module circuit short to power supply

DETECTION

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.

2008 Mazda CX-9 Grand Touring

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

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DIAGNOSTIC PROCEDURE

DTC B1056, B2777, B2778, B2779, B2780 DIAGNOSTIC PROCEDURE

CONDITION



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



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

POSSIBLE

CAUSE



Open or short circuit in wiring harness between passenger-side curtain air bag module

and SAS control module



Passenger-side curtain air bag module malfunction



SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE CURTAIN AIR
BAG MODULE



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

(See PID/DATA MONITOR TABLE.)



RES_CAB_P



Is the resistance of the passenger-side curtain air
bag module 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.

INSPECT PASSENGER-SIDE CURTAIN AIR
BAG MODULE CONNECTOR

WARNING:

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 48

© 2005 Mitchell Repair Information Company, LLC.