Mazda CX-9 Grand Touring. Manual — part 20

DTC B2290 DIAGNOSTIC PROCEDURE



Passenger sensing system circuit malfunction

POSSIBLE

CAUSE



Seat weight sensor calibration not properly set



Communication error between SAS control module and seat weight sensor control
module



Seat weight sensor control module internal malfunction



LH or RH seat weight sensor malfunction

STEP

INSPECTION

ACTION

1

INSPECT SEAT WEIGHT SENSOR
CONTROL MODULE CONNECTOR

WARNING:



Handling the air bag system
components improperly can
accidentally operate (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

Repair or replace the wiring harness. After
replacement, reperform the DTC inspection and
verify that no DTCs are displayed.

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

Turn the ignition switch to the LOCK
position.



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



Disconnect the seat weight sensor
control module connector. (See SEAT
WEIGHT SENSOR CONTROL
MODULE
REMOVAL/INSTALLATION .)



Is there any malfunction of the seat
weight sensor control module
connector?

No

Go to the next step.

2

INSPECT SEAT WEIGHT SENSOR
CONTROL MODULE POWER SUPPLY
CIRCUIT



Turn the ignition switch to the ON
position.



Measure voltage at terminal 3A of seat
weight sensor control module
connector.



Is voltage more than B+?

Yes Go to the next step.

No

If there is any malfunction in the wiring

harnesses, repair or replace the applicable wiring

harness.

After replacement, reperform the DTC
inspection and verity that no DTCs are

displayed.

3

INSPECTION WIRING HARNESS



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



Verify continuity in the following
wiring harnesses:



Between SAS control module
terminal 2AJ and seat weight
sensor control module terminal
3D



Between seat weight sensor
control module terminal 3B and
body ground



Is the continuity normal?

Yes Go to the next step.

No

If there is any malfunction in the wiring

harnesses, repair or replace the applicable wiring

harness.

After replacement, reperform the DTC

inspection and verify that no DTCs are

displayed.

INSPECT PASSENGER SENSING
SYSTEM

Yes Go to the next step.

Replace the following parts according to the M-

MDS screen:



If OCSFLT_CAL is displayed:

2008 Mazda CX-9 Grand Touring

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DTC B2477

DTC B2477 DETECTION CONDITION AND POSSIBLE CAUSE

4



Connect the seat weight sensor control
module connector.



Connect the SAS control module.



Connect the negative battery cable.



Verify the following PIDs using the
M-MDS. (See PID/DATA
MONITOR TABLE.)



OCSFLT_CAL



OCSFLT_COM



OCSFLT_L



OCSFLT_MDL



OCSFLT_R



Do all PIDs display "OK"?

No



Perform seat weight sensor

calibration (See SEAT WEIGHT

SENSOR CALIBRATION .)



If OCSFLT_COM or OCSFLT_MDL is

displayed:



Seat weight sensor control module

(See SEAT WEIGHT SENSOR

CONTROL MODULE

REMOVAL/INSTALLATION .)



If OCSFLT_L is displayed:



Seat weight sensor (LH) (See: 09-

13-3 FRONT SEAT

DISASSEMBLY/ASSEMBLY.)



If OCSFLT_R is displayed:



Seat weight sensor (RH) (See

FRONT SEAT

DISASSEMBLY/ASSEMBLY .)

5

INSPECT SAS CONTROL MODULE



Reperform the DTC inspection.



Is DTC B2290 indicated?

Yes

[Present malfunction diagnosis]



Replace the SAS control module.

(See SAS CONTROL MODULE
REMOVAL/INSTALLATION .)

[Past malfunction diagnosis]



DTC troubleshooting completed.

No

DTC troubleshooting completed.

DTC B2477

Configuration error

DETECTION

CONDITION



SAS control module configuration has not been performed correctly.

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



SAS control module configuration error

2008 Mazda CX-9 Grand Touring

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DIAGNOSTIC PROCEDURE

DTC B2477 DIAGNOSTIC PROCEDURE

DTC C1946, C1947, C1948, C1981, C1982

DTC C1946, C1947, C1948, C1981, C1982 DETECTION CONDITION AND POSSIBLE CAUSE

CAUSE



SAS control module malfunction

STEP

INSPECTION

ACTION

1

INSPECT SAS CONTROL MODULE



Using the M-MDS, perform SAS control
module configuration. (See SAS
CONTROL MODULE
CONFIGURATION .)



Is DTC B2477 indicated?

Yes

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

No

DTC troubleshooting completed.

DTC

C1946 Seat track position sensor circuit open
C1947 Seat track position sensor circuit short to body ground
C1948 Seat track position sensor circuit resistance not within specification
C1981 Seat track position sensor circuit malfunction
C1982 Seat track position sensor circuit short to power supply

DETECTION

CONDITION



Malfunction in seat track position 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



Malfunction of connector between seat track position sensor and SAS control module.



Open or short circuit in wiring harness between seat track position sensor and SAS

control module.



Seat track position sensor 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 10:18:47 AM

Page 80

© 2005 Mitchell Repair Information Company, LLC.