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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 269 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 73/B1900, 73/B1901, 73/B1902, 73/B1903: Left Seat Belt PRETENSIONER Squib Circuit Short, Open, Short To Ground Or Short To Battery >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to LOCK position. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. If using Lexus hand-held tester, retrieve 5 digit DTC. See RETRIEVING AIR BAG SYSTEM DTCS USING LEXUS HAND-HELD TESTER  under DIAGNOSTICS. If DTC B1900 is retrieved, go to next step. If DTC B1901 is retrieved, go to step  4. If DTC B1902 is retrieved, go to step  5. If DTC B1903 is retrieved, go to step  6. If using diagnosis check wire, retrieve 2 digit DTC. See RETRIEVING AIR BAG SYSTEM DTCS USING DIAGNOSIS CHECK WIRE  under DIAGNOSTICS. If DTC 73 is retrieved, go to step  7.
  2. Inspect left seat belt pretensioner connector for disengaged lock button or deformed or damaged lock claw. If connectors are okay, go to next step. If connectors are not okay, replace left seat belt pretensioner. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION.
  3. Release short spring mechanism on air bag sensor assembly connector A30. See RELEASING SHORTING SPRING  under DIAGNOSTICS. Measure resistance between Yellow/Black wire (circuit PD+) and Yellow wire (circuit PD-) on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . If resistance is less than one megohm, replace wire harness between left seat belt pretensioner and air bag sensor assembly. If resistance is more than one megohm, go to step  9.
  4. Measure resistance between Yellow/Black wire (circuit PD+) and Yellow wire (circuit PD-) on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . If resistance is less than one ohm, go to step  10. If resistance is more than one ohm, replace wire harness between left seat belt pretensioner and air bag sensor assembly.
  5. Measure resistance between ground and Yellow/Black wire (circuit PD+) on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . Measure resistance between ground and Yellow (circuit PD-) wire on harness side of left seat belt pretensioner connector. If resistance is more than one megohm, go to step  10. If resistance is less than one megohm, replace wire harness between left seat belt pretensioner and air bag sensor assembly.
  6. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Black wire (circuit PD+) on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow wire (circuit PD-) on harness side of left seat belt pretensioner connector. If voltage is less than one volt, go to step  10. If voltage is more than one volt, replace wire harness between left seat belt pretensioner and air bag sensor assembly.
  7. Inspect left seat belt pretensioner connector for disengaged lock button or deformed or damaged lock claw. If connectors are okay, go to next step. If connectors are not okay, replace left seat belt pretensioner. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION.
  8. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Black wire (circuit PD+) on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow wire (circuit PD-) on harness side of left seat belt pretensioner connector. Voltage should be less than one volt. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Measure resistance between Yellow/Black wire and Yellow wire on harness side of left seat belt pretensioner connector. Resistance should be less than one ohm. Measure resistance between ground and Yellow/Black wire on harness side of left seat belt pretensioner connector. Measure resistance between ground and Yellow wire on harness side of left seat belt pretensioner connector. Resistance should be more than one megohm. Release short spring mechanism on air bag sensor assembly connector A30. See RELEASING SHORTING SPRING  under DIAGNOSTICS. Measure resistance between Yellow/Black wire and Yellow wire on harness side of left seat belt pretensioner connector. Resistance should be more than one megohm. If voltage and resistance readings are normal, go to next step. If voltage and resistance readings are not normal, replace wire harness between left seat belt pretensioner and air bag sensor assembly.
  9. Replace left seat belt pretensioner. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Reconnect air bag sensor assembly harness connectors. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. See CLEARING AIR BAG SYSTEM DTCS USING DIAGNOSIS CHECK WIRE  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. If DTC 73 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC 73 is not displayed, test is complete.
  10. Reconnect air bag sensor assembly connectors. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTC B1900 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1900 is not displayed, go to step  12.
  11. If sent here from step  5, turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. If sent here from any step, reconnect air bag sensor assembly connectors. Connect jumper wire between Yellow/Black wire and Yellow wire on harness side of left seat belt pretensioner connector. See WIRING DIAGRAMS . Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTCs B1901, B1902 or B1903 are displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1901, B1902 or B1903 are not displayed, go to next step.
  12. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. If sent here from step  9, remove jumper wire. If sent here from any step, connect left side air bag module harness connectors. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTCs B1900, B1901, B1902 or B1903 are displayed, replace left seat belt pretensioner. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. If DTC B1900, B1901, B1902 or B1903 are not displayed, ensure air bag sensor assembly is in check mode. See CHECK MODE PROCEDURE  under DIAGNOSTICS. Check for intermittent air bag system fault. See AIR BAG WARNING LIGHT INTERMITTENT .
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