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2008 - MX-5 - Restraints

DTC B2290



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 control module connector malfunction

  • Open or short circuit in the wiring harness between the battery and the seat weight sensor control module

  • Open or short circuit in the wiring harness between the SAS control module and seat weight sensor control module

  • Open circuit in the wiring harness between the seat weight sensor control module and body ground

  • 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

  • SAS control module 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 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.

  • Remove the battery cover.

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

    (See BATTERY REMOVAL/INSTALLATION [LF].)

  • Disconnect the seat weight sensor control module connector.

  • Inspect the seat weight sensor control module connector. (Corrosion, damage, and disconnected pins)

  • 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.

No

Go to the next step.

2

INSPECT SEAT WEIGHT SENSOR CONTROL MODULE POWER SUPPLY CIRCUIT
  • Connect the negative battery cable.

  • 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 verify that no DTCs are displayed.

3

INSPECTION WIRING HARNESS
  • Verify continuity in the following wiring harnesses:

    • Between SAS control module terminal 3B 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.

4

INSPECT PASSENGER SENSING SYSTEM
  • Connect the seat weight sensor control module connector.

  • Connect the SAS control module connector.

  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position.

  • Verify the following PIDs using the M-MDS.

    (See PID/DATA MONITOR DISPLAY.)

    • OCSFLT_CAL

    • OCSFLT_COM

    • OCSFLT_L

    • OCSFLT_MDL

    • OCSFLT_R

    • OCSFLT_SNS

  • 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
  • Turn the ignition switch to the LOCK position.

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

    (See BATTERY REMOVAL/INSTALLATION [LF].)

  • Disconnect the seat weight sensor connector from the seat weight sensor control module.

  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position.

  • 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.)

No

6

INSPECT SAS CONTROL MODULE
  • Reperform the DTC inspection.

  • Is DTC B2290 indicated?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.




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