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2008 - MX-5 - Restraints

DTC B104C, B104F, B2886, U2018



DTC

B104C

Passenger-side air bag sensor assembly incorrect

B104F

Passenger‐side side air bag sensor system internal circuit disabled

B2886

Passenger-side side air bag sensor system communication data error

U2018

Passenger‐side side air bag sensor system communication error

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.

  • The SAS control module detects an error of impact magnitude set in the sensor, which occurs due to installation mismatch of the crash zone sensor or side air bag sensors.

  • Malfunction in wiring harness between passenger-side side air bag sensor and SAS control module

  • Malfunction in passenger-side side air bag sensor circuit

POSSIBLE CAUSE

  • Passenger-side side air bag sensor mis-installed with wrong sensor

  • Passenger-side side air bag sensor connector malfunction

  • Open or short circuit in wiring harness between passenger-side side air bag sensor and SAS control module

  • Passenger-side side air bag sensor malfunction

  • SAS control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER‐SIDE SIDE AIR BAG SENSOR CONNECTOR

WARNING:

  • Handling the air bag system components improperly can accidentally 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.

  • Remove the battery cover.

  • Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [LF].)

  • Remove the tire house trim (passenger-side). (See TIRE HOUSE TRIM REMOVAL/INSTALLATION.)

  • Disconnect the passenger-side side air bag sensor connector. (See SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)

  • Inspect the passenger-side side air bag sensor connector. (Corrosion, damage, and disconnected pins)

  • Is there any malfunction of the passenger-side side air bag sensor connector?

Yes

Replace the passenger-side side air bag sensor wiring harness.

No

Go to the next step.

2

INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE SIDE AIR BAG SENSOR AND SAS CONTROL MODULE

NOTE:

  • Inspect for continuity while shaking the wiring harness between the SAS control module and the passenger-side side air bag sensor.

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the wiring harness between the SAS control module and the passenger-side side air bag sensor.

3

INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND PASSENGER-SIDE SIDE AIR BAG SENSOR FOR A SHORT CIRCUIT TO THE POWER SUPPLY
  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position with SAS control module connector and passenger-side side air bag sensor connector disconnected.

  • Measure the voltage of SAS control module connector terminals 2X and 2AA.

NOTE:

  • Measure the voltage while shaking the wiring harness between the SAS control module and the passenger-side side air bag sensor.

  • Is the voltage measured?

Yes

Replace the wiring harness between the SAS control module and the passenger-side side air bag sensor.

No

Replace the passenger-side side air bag sensor, then go to the next step.

(See SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)

4

PERFORM SAS CONTROL MODULE DTC INSPECTION
  • Turn the ignition switch to the LOCK position.

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

  • Reconnect all disconnected connectors.

  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position.

  • Clear the DTC for the SAS control module using the M-MDS.

    (See CLEARING DTC.)

  • Perform the DTC inspection for the SAS control module using the M-MDS.

    (See DTC DISPLAY.)

  • Are the same DTCs present?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.




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