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.

 

2008 Mazda CX-9 Grand Touring 

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

  

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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 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:18:47 AM

Page 78 

© 2005 Mitchell Repair Information Company, LLC. 

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 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:18:47 AM

Page 79 

© 2005 Mitchell Repair Information Company, LLC. 

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.