DTC B2290

DTC B2290 DETECTION CONDITION AND POSSIBLE CAUSE

DTC B2290	Passenger sensing system 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 DIAGNOSIS 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 air bag system 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. 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	INSPECTION WIRING HARNESS Disconnect the SAS control module connector. Verify continuity in the following wiring harnesses: Between SAS control module terminal 2AJ and seat weight sensor control module terminal 3D Between the battery and seat weight sensor control module terminal 3A Between seat weight sensor control module terminal 3B and body ground Is the continuity normal?	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	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 DISPLAY ). OCS_FLT Is NO_Fail displayed?	Yes	Go to the next step.
3		No	Replace the following parts according to the M-MDS screen: If MOD_Fail or COMM_Fail is displayed: Seat weight sensor control module (See SEAT WEIGHT SENSOR CONTROL MODULE REMOVAL/INSTALLATION .) If SNS_Fail_L is displayed: Seat weight sensor (LH) (See: FRONT SEAT DISASSEMBLY/ASSEMBLY .) If SNS_Fail_R is displayed: Seat weight sensor (RH) (See FRONT SEAT DISASSEMBLY/ASSEMBLY .) If SNS_Fail is displayed: Seat weight sensor (See FRONT SEAT DISASSEMBLY/ASSEMBLY .) If CAL_Fail is displayed: Perform seat weight sensor calibration (See SEAT WEIGHT SENSOR CALIBRATION .)
4	INSPECT SAS CONTROL MODULE Reperform the DTC inspection. Is DTC B2290 indicated?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION .)
4		No	DTC troubleshooting completed.