DTC B2290

DTC B2290 DETECTION CONDITION AND POSSIBLE CAUSE

DTC B2290	Seat weight sensor signal malfunction
DETECTION CONDITION	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. 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
Courtesy of MAZDA MOTORS CORP.

DTC B2290 DIAGNOSTIC PROCEDURE

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 .) 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?	Yes	Repair or replace the wiring harness. After replacement, reperform the DTC inspection and verify that no DTCs are displayed.
1		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.
2		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.
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.
3		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.
4	INSPECT PASSENGER SENSING SYSTEM 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"?	Yes	Go to the next step.
4		No	Replace the following parts according to the M-MDS screen: If OCSFLT_CAL is displayed: 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: 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 diangnosis] Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .) [Past malfunction diagnosis] DTC troubleshooting completed.
5		No	DTC troubleshooting completed.