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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 417 (On-Board Diagnostic (Air Bag System - Standard Deployment Control System)) >> DTC 91: Air Bag System Warning Light Circuit >> Diagnostic procedure

Diagnostic procedure

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

STEP INSPECTION ACTION
1
  • Is this present malfunction diagnosis?
 Yes Replace SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM] )
No Go to the next step.
2 INSPECT METER 10 A FUSE 
  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable.
  • Remove METER 10 A fuse.
  • Is fuse normal?
 Yes Reinstall METER 10 A fuse, then go to the next step.
No Replace METER 10 A fuse.
3 INSPECT AIR BAG SYSTEM WARNING LIGHT BULB  Yes Reinstall air bag system warning light bulb, then go to the next step.
No Replace air bag system warning light bulb.
4 INSPECT INSTRUMENT CLUSTER 
  • Is there continuity between instrument cluster terminals 3J and 3R?
 Yes Go to the next step.
No Replace instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION )
5 INSPECT FOR CONTINUITY BETWEEN METER 10 A FUSE AND INSTRUMENT CLUSTER 
  • Connect negative battery cable.
  • Turn ignition switch to ON position.
  • Measure voltage at instrument cluster terminal 3J.
  • Is voltage more than 9 V  ?
 Yes Go to the next step.
No Repair wiring harness.
6 INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS CONTROL MODULE 
WARNING:
  • Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner front buckles, which may seriously injure you. Read the service warnings 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 1 min or more  .
  • Remove column cover.
  • Disconnect clock spring connector.
  • Remove glove compartment.
  • Disconnect passenger-side air bag module connector.
  • Disconnect driver- and passenger-side side air bag module connectors. (Vehicles with side air bag)
  • Remove driver- and passenger-side B-pillar lower trims.
  • Disconnect driver- and passenger-side pre-tensioner seat belt connectors.
  • Turn up floor covering.
  • Disconnect all SAS control module connectors.
  • Inspect wiring harness between instrument cluster terminal 3R and SAS control module terminal 2W for following.
    • Short to ground
    • Short to power supply
    • Open circuit
  • Is wiring harness normal?
 Yes Go to the next step.
No Replace wiring harness.
7 INSPECT WIRING HARNESS BETWEEN DLC AND SAS CONTROL MODULE 
  • Inspect wiring harness between DLC terminal FAB and SAS control module terminal 2W for following.
    • Short to ground
    • Short to power supply
  • Is wiring harness normal?
 Yes Troubleshooting completed.
No Replace wiring harness.
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