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2008 - MX-5 - Restraints

DTC C1946, C1947, C1948, C1982



DTC

C1946

Seat track position sensor circuit open

C1947

Seat track position sensor circuit short to body ground

C1948

Seat track position sensor circuit resistance not within specification

C1982

Seat track position sensor circuit short to power supply

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 seat track position sensor circuit.

POSSIBLE CAUSE

  • Malfunction of connector between seat track position sensor and SAS control module.

  • Open or short circuit in wiring harness between seat track position sensor and SAS control module.

  • Seat track position sensor malfunction

  • SAS control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT SEAT TRACK POSITION SENSOR CIRCUIT
  • Using the M-MDS, verify the following PID/DATA monitor.

    (See PID/DATA MONITOR TABLE.)

    • TRAK_SW

  • Is the seat track position sensor circuit normal?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Go to the next step.

2

INSPECT WIRING HARNESS BETWEEN SEAT TRACK POSITION SENSOR AND SAS CONTROL MODULE

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.)

  • 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 passengerā€side seat connectors.

  • Remove the back trim.

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

  • Disconnect the seat track position sensor connector.

  • Inspect the wiring harness between SAS control module terminal and seat track position sensor terminals for short to ground, short to power supply, and open circuit:

    • 3M—C

    • 3P—A

  • Is the wiring harness normal?

Yes

Replace the seat track position sensor, then go to the next step.

No

Replace wiring harness, then go to the next step.

3

INSPECT SAS CONTROL MODULE
  • Connect the SAS control module connector.

  • Connect the driver-side air bag module connector.

  • Connect the passenger-side air bag module connector.

  • Connect the driver-and passenger-side side air bag module connectors.

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

  • Connect the seat track position sensor connector.

  • Are DTCs C1946, C1947, C1948 and/or C1982 indicated?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.




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