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2008 - MX-5 - Restraints

DTC B104D, B2226, B2227, B2856



DTC

B104D

Crash zone sensor assembly incorrect

B2226

Crash zone sensor system internal circuit disabled

B2227

Crash zone sensor system communication error

B2856

Crash zone sensor system communication data 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 crash zone sensor and SAS control module

  • Malfunction in crash zone sensor circuit

POSSIBLE CAUSE

  • Crash zone sensor mis-installed with wrong sensor

  • Crash zone sensor connector malfunction

  • Open or short circuit in the wiring harness between the crash zone sensor and SAS control module

  • Crash zone sensor malfunction

  • SAS control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT CRASH ZONE SENSOR 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

Replace the crash zone sensor wiring harness.

No

Go to the next step.

2

INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND CRASH ZONE SENSOR

NOTE:

  • Inspect for continuity while shaking the wiring harness between the SAS control module and crash zone sensor.

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the wiring harness between the SAS control module and the crash zone sensor.

3

INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND CRASH ZONE 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 and crash zone sensor connector disconnected.

  • Measure the voltage of SAS control module connector terminals 1B and 1E.

NOTE:

  • Measure the voltage while shaking the wiring harness between the SAS control module and crash zone sensor.

  • Is the voltage measured?

Yes

Replace the wiring harness between the SAS control module and the crash zone sensor.

No

Replace the crash zone sensor, then go to the next step.

(See CRASH ZONE SENSOR 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 1min or more.

  • Connect the crash zone sensor connector.

  • Connect the SAS control module 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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