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Home >> Mazda >> 2018 >> MX-5 Miata Club, Standard Trans >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> On-Board Diagnostic - SAS Control Module - Two-Step Deployment Control System >> DTC B00A0-81; B00A0-87; Occupant Classification Sensor Memory Check Sum Error >> Diagnostic Procedure
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Diagnostic Procedure

Step Inspection Action
1 INSPECT OCCUPANT CLASSIFICATION SENSOR CONNECTOR
WARNING:

Yes Replace the malfunctioning part, then go to Step 5.
No Go to the next step.
2 INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR SHORT TO GROUND
  • Occupant classification sensor and fuse block connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • SAS control module connector terminal 3S
    • SAS control module connector terminal 3Q
    NOTE:
    • Inspect for continuity while shaking the wiring harness between the SAS control module and occupant classification sensor.
  • Is there continuity?
 Yes Replace the wiring harness for a possible short to ground, then go to Step 5.
No Go to the next step.
3 INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Occupant classification sensor and fuse block connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Occupant classification sensor terminal 4A-SAS control module connector terminal
    • 3S - Occupant classification sensor terminal 4B-SAS control module connector terminal 3Q
    NOTE:
    • Inspect for continuity while shaking the wiring harness between the SAS control module and occupant classification sensor.
  • Is there continuity?
 Yes Go to the next step.
No Replace the wiring harness for a possible open circuit, then go to Step 5.
4 INSPECT OCCUPANT CLASSIFICATION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
  • Occupant classification sensor and fuse block connectors are disconnected.
  • Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION ).
  • Switch the ignition ON (engine off or on).
  • Measure the voltage at the following terminals (wiring harness-side):
    • SAS control module connector terminal 3S
    • SAS control module connector terminal 3Q
    NOTE:
    • Measure the voltage while shaking the wiring harness between the SAS control module and occupant classification sensor.
  • Is the voltage 0V?
 Yes Go to the next step.
No Replace the wiring harness for a possible short to power supply, then go to the next step.
5 INSPECT OCCUPANT CLASSIFICATION SENSOR
 Yes Go to the next step.
No Repair or replace the wiring harness or connector, then go to the next step.
6 PERFORM SAS CONTROL MODULE DTC INSPECTION
 Yes Replace the occupant classification sensor.
(See OCCUPANT CLASSIFICATION SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT SYSTEM] ).
Then go to the next step.
No DTC troubleshooting completed.
7 VERIFY TROUBLESHOOTING COMPLETED
 Yes Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] ).
No DTC troubleshooting completed.
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