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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 529 (On-Board Diagnostic [Air Bag System)) >> DTC 91: Air Bag System Warning Light Circuit >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC 91 - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Is this present malfunction diagnosis?
 Yes Replace SAS CM.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION )
No Go to next step.
2 INSPECT METER 15 A FUSE 
  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable.
  • Remove METER 15 A fuse.
  • Is fuse okay?
 Yes Reinstall METER 15 A fuse, then go to next step.
No Replace METER 15 A fuse.
3 INSPECT AIR BAG SYSTEM WARNING LIGHT BULB  Yes Reinstall air bag system warning light bulb, then go to next step.
No Replace air bag system warning light bulb.
4 INSPECT INSTRUMENT CLUSTER 
  • Is there continuity between instrument cluster terminals 1C and 3D?
 Yes Go to next step.
No Replace instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION )
5 INSPECT FOR CONTINUITY BETWEEN METER 15 A FUSE AND INSTRUMENT CLUSTER 
  • Connect negative battery cable.
  • Turn ignition switch to ON position.
  • Measure voltage at instrument cluster connector terminal 1C.
  • Is voltage more than 9 V? 
 Yes Go to next step.
No Repair wiring harness.
6 INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS CM 
WARNING:
  • Handling air bag system components improperly can accidentally deploy air bag modules and pre-tensioner seat belt, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling air bag system components.

    (See AIR BAG SYSTEM SERVICE WARNINGS )

  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable and wait for more than 1 minute. 
  • Remove driver- and passenger-side quarter trims.
  • Disconnect driver- and passenger-side pre-tensioner seat belt connectors.
  • Remove dashboard.

    (See DASHBOARD REMOVAL/INSTALLATION .)

  • Disconnect SAS CM connector.
  • Inspect wiring harness between instrument cluster connector terminal 3D and SAS CM connector terminal Q for following.
    • Short to ground
    • Short to power supply
    • Open circuit
  • Is wiring harness okay?
 Yes Go to next step.
No Replace wiring harness.
7 INSPECT WIRING HARNESS BETWEEN DLC AND SAS CM 
  • Inspect wiring harness between DLC terminal FAB and SAS CM connector terminal Q for following.
    • Short to ground
    • Short to power supply
  • Is wiring harness okay?
 Yes Troubleshooting completed.
No Replace wiring harness.
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