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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 74/B0136: Open In Left Seat Belt PRETENSIONER Squib Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access air bag sensor assembly and disconnect harness connector A16. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Access left seat belt pretensioner and disconnect harness connector. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Measure resistance between Yellow/Black wire and Yellow wire on harness side of left seat belt pretensioner squib harness connector. See WIRING DIAGRAMS . If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair or replace harness or connector between left seat belt pretensioner and air bag sensor assembly.
  2. Reconnect air bag sensor assembly harness connector A16. Connect jumper wire between Yellow/Black wire and Yellow wire on harness side of left seat belt pretensioner squib harness connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING DTCS  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING DTCS  under DIAGNOSTICS. If DTC 74/B0136 is not displayed, go to next step. If DTC 74/B0136 is displayed, replace air bag sensor assembly.
  3. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect left seat belt pretensioner squib harness connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING DTCS  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING DTCS  under DIAGNOSTICS. If DTC 74/B0136 is not displayed, system is functioning properly at this time. Check for intermittent air bag system fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 74/B0136 is displayed, replace left seat belt pretensioner.
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