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2008 - MX-5 - Restraints

DTC B2437, B2438



DTC

B2437

Passenger‐side buckle switch circuit open or short to power supply

B2438

Passenger‐side buckle switch circuit short to body ground

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.

  • Malfunction in the wiring harness between the passenger-side buckle switch and SAS control module

  • Malfunction in passenger-side buckle switch circuit

POSSIBLE CAUSE

  • Malfunction of connectors between passenger-side buckle switch and SAS control module

  • Open or short circuit in wiring harness between passenger-side buckle switch and SAS control module

  • Passenger-side buckle switch malfunction

  • SAS control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT DRIVER‐SIDE BUCKLE SWITCH CIRCUIT
  • Using the M-MDS, verify the following PID/DATA monitor. (See PID/DATA MONITOR TABLE.)

    • BUCKLE_P

  • Is the passenger-side buckle switch normal?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Go to the next step.

2

INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND GROUND

WARNING:

  • Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belt, 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 passenger-side buckle switch connector.

  • Inspect the wiring harness between passenger-side buckle switch terminal B and ground for the following:

    • Short to power supply

    • Open circuit

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the wiring harness.

3

INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND SAS CONTROL MODULE
  • Disconnect the driver and passenger-side seat connectors.

  • Remove the back trim.

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

  • Disconnect the SAS control module connector.

  • Inspect the wiring harness between SAS control module terminal 3J and passenger-side buckle switch terminal A,SAS control module terminal 3G and passenger-side buckle switch terminal B for the following:

    • Short to ground

    • Short to power supply

    • Open circuit

  • Is the wiring harness normal?

Yes

Replace the passenger-side buckle.

(See BUCKLE REMOVAL/INSTALLATION.)

If the DTC is displayed even after the buckle switch is replaced, replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Replace the wiring harness.




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