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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 377 (On-Board Diagnostic (Air Bag System]) >> DTC B1426, B1427 >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1426, B1427 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT METER IG 15 A FUSE 
  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable.
  • Remove METER IG 15 A fuse.
  • Is fuse okay?
 Yes Reinstall METER IG 15 A fuse, then go to next step.
No Replace METER IG 15 A fuse.
2 INSPECT FOR CONTINUITY BETWEEN METER IG 15 A FUSE AND INSTRUMENT CLUSTER 
  • Connect negative battery cable.
  • Turn ignition switch to ON position.
  • Measure voltage at instrument cluster connector terminal 2V.
  • Is voltage more than 9 V? 
 Yes Go to next step.
No Repair wiring harness.
3 INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS CONTROL MODULE 
WARNING:
  • Handling the air bag system components improperly can accidentally operate (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 SERVICE WARNINGS .)

    (See SERVICE CAUTIONS .)


  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable and wait for more than 1 minute. 
  • Remove column cover.
  • Disconnect clock spring connector.
  • Remove glove compartment.
  • Disconnect passenger-side air bag module connector.
  • Disconnect driver and passenger-side curtain air bag module connectors. (Vehicles with curtain air bag)
  • Disconnect driver and passenger-side side air bag module connectors. (Vehicles with side air bag)
  • Remove B-pillar lower trims. (Vehicles with pre-tensioner seat belt)
  • Disconnect driver and passenger-side pre-tensioner seat belt connectors. (Vehicles with pre-tensioner seat belt)
  • Turn up floor covering.
  • Disconnect all SAS control module connectors.
  • Disconnect instrument cluster.
  • Inspect the following wiring harness between SAS control module and instrument cluster terminals for short to ground, short to power supply, and open circuit:
    • 1E-2G
  • Is wiring harness okay?
 Yes Go to next step.
No Replace wiring harness.
4 INSPECT SEAT BELT WARNING LIGHT 
  • Connect instrument cluster.
  • Using a jumper wire, cause a short circuit between instrument cluster terminal 2G and ground.
  • Turn ignition switch to ON position.
  • Is seat belt warning light illuminated?
 Yes Present malfunction diagnosis: 

Past malfunction diagnosis: 
  • Troubleshooting completed.
No Replace instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
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