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2008 - MX-5 - Restraints

DTC B2229, B2231, B2233, B2235



DTC

B2229

Passenger‐side air bag module (inflator No.2) circuit short to body ground

B2231

Passenger‐side air bag module (inflator No.2) circuit short to power supply

B2233

Passenger‐side air bag module (inflator No.2) circuit resistance high

B2235

Passenger‐side air bag module (inflator No.2) circuit resistance low

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.

  • Resistance other than 1.3—4.7 ohms detected in passenger-side side air bag module circuit

  • Malfunction in wiring harness between passenger-side air bag module (inflator No.2) and SAS control module

POSSIBLE CAUSE

  • Open or short circuit in wiring harness between passenger-side air bag module (inflator No.2) and SAS control module

  • Passenger-side air bag module (inflator No.2) malfunction

  • SAS control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER‐SIDE AIR BAG MODULE (INFLATOR NO.2)
  • Using the M-MDS, verify the following PID/DATA monitor.

    (See PID/DATA MONITOR TABLE.)

    • RES_AB2_P

  • Is the resistance of the passenger-side air bag module normal?

    • Resistance: 1.3—4.7 ohms

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Go to the next step.

2

INSPECT PASSENGER‐SIDE AIR BAG MODULE (INFLATOR NO.2) 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 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.)

Yes

Replace the air bag wiring harness.

No

Go to the next step.

3

VERIFY WHETHER MALFUNCTION IS IN PASSENGER-SIDE AIR BAG MODULE (INFLATOR NO.2) OR RELATED WIRING HARNESS
  • Connect the leads of the SST (Fuel and thermometer checker) or apply 2-ohm resistance to passenger-side air bag module (inflator No.1) connector terminals 1A and 1B, and passenger-side air bag module (inflator No.2) connector terminals 2A and 2B.

  • Set the resistance of the SST (Fuel and thermometer checker) to the 2-ohm position.

  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position.

  • Are DTCs B2229, B2231, B2233 and/or B2235 indicated?

Yes

Go to the next step.

No

Replace the passenger-side air bag module.

(See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)

4

INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE AIR BAG MODULE (INFLATOR NO.2) AND SAS CONTROL MODULE
  • 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 column cover.

  • Disconnect the clock spring connector.

  • Remove the glove compartment.

  • Disconnect the passenger-side air bag module connector.

    (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)

  • Disconnect the driver and passenger-side seat connectors.

  • Remove the back trim.

  • Disconnect the driver and passenger-side pre-tensioner seat belt connectors.

  • Inspect the wiring harness between SAS control module terminal 1M and passenger-side air bag module terminal 2A, SAS control module terminal 1P and passenger-side air bag module terminal 2B for the following:

    • Short to ground

    • Short to power supply

    • Open circuit

  • Is the wiring harness normal?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Replace the air bag wiring harness.




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