Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 2018 >> CX-3 Touring, AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> On-Board Diagnostic - Two-Step Deployment Control System >> DTC B00A0-81; Invalid Signal To Sas Control Module: B00A0-87; Error Signal From Occupant Classification Sensor >> Diagnostic Procedure

Diagnostic Procedure

DTC B00A0-81; INVALID SIGNAL TO SAS CONTROL MODULE: B00A0-87; ERROR SIGNAL FROM OCCUPANT CLASSIFICATION SENSOR 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 control module.
  • 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 3D-SAS control module connector terminal 3S
    • Occupant classification sensor terminal 3C-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 PERFORM SAS CONTROL MODULE DTC INSPECTION Yes Replace the occupant classification sensor.
(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)
Then go to the next step.
No DTC troubleshooting completed.
6 VERIFY TROUBLESHOOTING COMPLETED Yes Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
No DTC troubleshooting completed.
scientia non olet · About Mike's Workshop Manuals