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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> On-Board Diagnostic [Air Bag System - Two-Step Deployment Control System) >> DTC C1946, C1947, C1948, C1981, C1982 [Two-Step Deployment Control System] >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 INSPECT SEAT TRACK POSITION SENSOR 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 service warnings and cautions before handling the air bag system components.

    (See AIR BAG SYSTEM SERVICE WARNINGS .)

    (See AIR BAG SYSTEM SERVICE CAUTIONS .)

  • Switch the ignition to off.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Disconnect the seat track position sensor connector.
  • Inspect the seat track position sensor connection. (Corrosion, damage, and disconnected pins)
  • Is there any malfunction of the seat track position sensor connector?
 Yes Replace the seat track position sensor wiring harness.
No Go to the next step.
2 INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND SEAT TRACK POSITION SENSOR 
  • Inspect the wiring harnesses between SAS control module connector terminal 2AF and seat track position sensor terminal C, and SAS control module connector terminal 2AB and seat track position sensor terminal A for the following:
    • Short circuit between terminals
    • Short to body ground
    • Open circuit
NOTE:
  • Inspect for continuity while shaking the wiring harness between the SAS control module and seat track position sensor.
  • Is the wiring harness normal?
 Yes Go to the next step.
No Replace the wiring harness between the SAS control module and the seat track position sensor.
3 INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND SEAT TRACK POSITION SENSOR FOR A SHORT CIRCUIT TO THE POWER SUPPLY 
  • Connect the negative battery cable.
  • Switch the ignition to ON with SAS control module connector and seat track position sensor connector disconnected.
  • Measure the voltage of SAS control module connector terminals 2AB and 2AF of SAS control module harness side connector.
NOTE:
  • Measure the voltage while shaking the wiring harness between the SAS control module and seat track position sensor.
  • Is the voltage measured?
 Yes Replace the wiring harness between the SAS control module and the seat track position sensor.
No Replace the seat track position sensor, then go to the next step.
4 PERFORM SAS CONTROL MODULE DTC INSPECTION  Yes Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION .)
No DTC troubleshooting completed.
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