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Home >> Mazda >> 2013 >> 5 Touring >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> On-Board Diagnostic [Air Bag System - Two-Step Deployment Control System) >> DTC B104C, B104F, B1050, U2018 [Two-Step Deployment Control System] >> Diagnostic Procedure

Diagnostic Procedure

Step INSPECTION Action
1 INSPECT PASSENGER-SIDE SIDE AIR BAG SENSOR NO.1 CONNECTOR 
WARNING:
  • Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual 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  .
  • Remove the passenger-side B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION .)
  • Disconnect the passenger-side side air bag sensor No.1 connector. (See SIDE AIR BAG SENSOR NO. 1 REMOVAL/INSTALLATION .)
  • Inspect the passenger-side side air bag sensor No.1 connector. (Corrosion, damage, and disconnected pins)
  • Is there any malfunction of the passenger-side side air bag sensor No.1 connector?
 Yes Replace the passenger-side side air bag sensor No.1 wiring harness.
No Go to the next step.
2 INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND PASSENGER-SIDE SIDE AIR BAG SENSOR NO.1 
NOTE:
  • Inspect for continuity while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor No.1.
  • Is the wiring harness normal?
 Yes Go to the next step.
No Replace the wiring harness between the SAS control module and the passenger-side side air bag sensor No.1.
3 INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND PASSENGER-SIDE SIDE AIR BAG SENSOR NO.1 FOR A SHORT CIRCUIT TO THE POWER SUPPLY 
  • Connect the negative battery cable.
  • Switch the ignition to ON with SAS control module connector and passenger-side side air bag sensor No.1 connector disconnected.
  • Measure the voltage of SAS control module connector terminals 2K and 2G of SAS control module harness side connector.
NOTE:
  • Measure the voltage while shaking the wiring harness between the SAS control module and passenger-side side air bag sensor No.1.
  • Is the voltage measured?
 Yes Replace the wiring harness between the SAS control module and the passenger-side side air bag sensor No.1.
No Replace the passenger-side side air bag sensor No.1, then go to the next step.
(See SIDE AIR BAG SENSOR NO. 1 REMOVAL/INSTALLATION .)
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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