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2008 - MX-5 - Restraints

DTC B1871



DTC B1871

Passenger air bag deactivation (PAD) switch system circuit disabled

DETECTION CONDITION

WARNING:

  • Detection conditions are for understanding DTC outline before performing inspection. Performing inspection with only detection conditions may cause injury due to operating error or damage the system. When performing inspection, always follow inspection procedure.

  • Malfunction in wiring harness between PAD switch and SAS control module

  • Malfunction in PAD switch circuit

POSSIBLE CAUSE

  • Open or short circuit in wiring harness between PAD switch and SAS control module

  • PAD switch circuit malfunction

  • SAS control module malfunction

  • PAD switch assembly incorrect


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT PAD SWITCH
  • Using the M-MDS, verify the following PID/DATA monitor.

    (See PID/DATA MONITOR TABLE.)

    • I_PAD_SW

  • Is the PAD switch normal?

Yes

Go to the next step.

No

Replace the PAD switch

(See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH REMOVAL/INSTALLATION.)

2

INSPECT WIRING HARNESS BETWEEN PAD SWITCH 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].)

  • Disconnect the PAD switch connectors.

  • Inspect the wiring harness between SAS control module terminal 1Q and PAD switch terminal D, SAS control module terminal 1H and PAD switch terminal C for the following:

    • Short to ground

    • Open circuit

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Replace the air bag wiring harness.

3

INSPECT PAD SWITCH
  • Disconnect the PAD switch connectors.

  • Is there continuity between terminal E of PAD switch connector and ground?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Replace the air bag wiring harness.




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