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Home >> Mazda >> 2012 >> 5 Sport, Automatic Trans >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> On-Board Diagnostic [Air Bag System - Two-Step Deployment Control System) >> DTC B2290 [Two-Step Deployment Control System] >> Diagnostic Procedure
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Diagnostic Procedure

Step INSPECTION Action
1 INSPECT SEAT WEIGHT SENSOR CONTROL MODULE CONNECTOR 
WARNING:
  • Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual 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.
No Go to the next step.
2 INSPECT SEAT WEIGHT SENSOR CONTROL MODULE POWER SUPPLY CIRCUIT 
NOTE:
  • Measure the voltage while shaking the wiring harness between the seat weight sensor control module and fuse block.
  • Is the voltage measured?
Yes Go to the next step.
No Repair the wiring harness between the seat weight sensor control module and fuse block.
3 INSPECT WIRING HARNESS 
  • 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
NOTE:
  • Inspect for continuity while shaking the wiring harness between the SAS control module and seat weight sensor control module.
  • 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.
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 [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)

    • OCSFLT_CAL
    • OCSFLT_COM
    • OCSFLT_L
    • OCSFLT_MDL
    • OCSFLT_R
  • Do all PIDs display "OK"?
Yes Go to the Step 6.
No Perform the following procedures according to the M-MDS screen indication:
5 INSPECT SEAT WEIGHT SENSOR CONTROL MODULE 
  • Switch the ignition to off.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Disconnect the seat weight sensor connector from the seat weight sensor control module.
  • Connect the negative battery cable.
  • Switch the ignition to ON.
  • Measure the voltage between the following terminals:
    CAUTION:
    • When measuring the voltage at a terminal of the seat weight sensor control module, measure it being careful not to bend or damage the terminal.
    • Seat weight sensor control module terminal 1A (module side) and body ground
    • Seat weight sensor control module terminal 2A (module side) and body ground
  • Is the voltage approx. 0 V  ?
Yes Replace the seat weight sensor control module, then go to the next step. (See SEAT WEIGHT SENSOR CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
No
6 PERFORM SAS CONTROL MODULE DTC INSPECTION  Yes Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION .)
No DTC troubleshooting completed.