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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 86/B1168: Short To Battery In Left Side Curtain Air Bag Squib Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Lexus ES 300. 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 A30. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Access left side curtain air bag module and disconnect harness connector. See SIDE CURTAIN AIR BAG MODULE  under REMOVAL & INSTALLATION. Connect negative battery cable. Turn ignition switch to ON position. Measure voltage in Violet wire, between ground and harness side of left side curtain air bag squib harness connector. See WIRING DIAGRAMS . If voltage is less than one volt, go to next step. If voltage is more than one volt, repair or replace harness or connector between left side curtain air bag module and air bag sensor assembly.
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect air bag sensor assembly harness connector A30. Connect jumper wire between Orange wire and Violet wire on harness side of left side curtain air bag 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 86/B1168 is not displayed, go to next step. If DTC 86/B1168 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 side curtain air bag 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. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve DTCs. If DTC 86/B1168 is not displayed, go to next step. If DTC 86/B1168 is displayed, replace left side curtain air bag module.
  4. Check for intermittent air bag system fault. See AIR BAG WARNING LIGHT INTERMITTENT . If AIR BAG warning light illuminates while checking for intermittent fault, go to step  1. If AIR BAG warning light does not illuminate while checking for intermittent fault, replace all air bag system components, including wiring harness.
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