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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag Restraint System >> Diagnostic Tests >> DTC 74: Open In Driver-Side Seat Belt PRETENSIONER Squib Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.
  2. Measure resistance between driver-side seat belt pretensioner squib harness connector Black/Yellow wire (circuit PL+) and White/Green wire (circuit PL-). See WIRING DIAGRAMS . If resistance is more than one ohm, repair or replace harness or connector between driver-side seat belt pretensioner and air bag sensor assembly. If resistance is less than one ohm, go to next step.
  3. Reconnect air bag sensor assembly connector C17 to air bag sensor assembly. Connect jumper wire between driver-side seat belt pretensioner squib harness connector Black/Yellow wire (circuit PL+) and White/Green wire (circuit PL-). Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSIS & TESTING. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSIS & TESTING. If DTC 74 is not displayed, go to next step. If DTC 74 is displayed, replace air bag sensor assembly.
  4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect driver-side seat belt pretensioner connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSIS & TESTING. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSIS & TESTING. If DTC 74 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 74 is displayed, replace driver-side seat belt pretensioner.
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