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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 54/B1815, 54/B1816, 54/B1817, 54/B1818: Passenger-Side Air Bag No. 2 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 B1815 is retrieved, go to next step. If DTC B1816 is retrieved, go to step  4. If DTC B1817 is retrieved, go to step  5. If DTC B1818 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 54 is retrieved, go to step  7.
  2. Inspect passenger-side air bag module connectors for disengaged lock button or deformed or damaged lock claw. If connectors are okay, go to next step. If connectors are not okay, replace passenger-side air bag module. See PASSENGER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION.
  3. Release short spring mechanism on air bag sensor assembly connector A31. See RELEASING SHORTING SPRING  under DIAGNOSTICS. Measure resistance between Yellow/Gray wire (circuit P2+) and Yellow/Pink wire (circuit P2-) on harness side of Orange passenger-side air bag module connector. See WIRING DIAGRAMS . If resistance is less than one megohm, go to step  13. If resistance is more than one megohm, go to step  10.
  4. Measure resistance between Yellow/Gray wire (circuit P2+) and Yellow/Pink wire (circuit P2-) on harness side of Orange passenger-side air bag module connector. See WIRING DIAGRAMS . If resistance is less than one ohm, go to step  11. If resistance is more than one ohm, go to step  15.
  5. Measure resistance between ground and Yellow/Gray wire (circuit P2+) on harness side of Orange passenger-side air bag module connector. See WIRING DIAGRAMS . Measure resistance between ground and Yellow/Pink (circuit P2-) wire on harness side of Orange passenger-side air bag module connector. If resistance is more than one megohm, go to step  11. If resistance is less than one megohm, go to step  17.
  6. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Gray wire (circuit P2+) on harness side of Orange passenger-side air bag module connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow/Pink wire (circuit P2-) on harness side of Orange passenger-side air bag module connector. If voltage is less than one volt, go to step  11. If voltage is more than one volt, go to step  19.
  7. Inspect passenger-side air bag module connectors for disengaged lock button or deformed or damaged lock claw. If connectors are okay, go to next step. If connectors are not okay, replace passenger-side air bag module. See PASSENGER-SIDE AIR BAG MODULE  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/Gray wire (circuit P2+) on harness side of Orange passenger-side air bag module connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow/Pink wire (circuit P2-) on harness side of Orange passenger-side air bag module 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/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. Resistance should be less than one ohm. Measure resistance between ground and Yellow/Gray wire on harness side of Orange passenger-side air bag module connector. Measure resistance between ground and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. Resistance should be more than one megohm. Release short spring mechanism on air bag sensor assembly connector A31. See RELEASING SHORTING SPRING  under DIAGNOSTICS. Measure resistance between Yellow/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module 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, go to step  19.
  9. Replace passenger-side air bag module. See PASSENGER-SIDE AIR BAG MODULE  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 54 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC 54 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 B1815 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1815 is not displayed, go to step  12.
  11. If sent here from step  6, 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/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module 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 B1816, B1817 or B1818 are displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1816, B1817 or B1818 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  11, remove jumper wire. If sent here from any step, connect spiral cable harness connectors to passenger-side air bag module 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 B1815, B1816, B1817 or B1818 are displayed, replace passenger-side air bag module. See PASSENGER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. If DTC B1815, B1816, B1817 or B1818 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 .
  13. Disconnect instrument panel 4-pin connector A33, located near passenger-side air bag module. Measure resistance between Yellow/Red wire (circuit P2+) and Yellow/Green wire (circuit P2-) on harness side of instrument panel 4-pin connector A33. If resistance is less than one megohm, replace wiring harness between air bag sensor assembly and instrument panel 4-pin connector A33. If resistance is more than one megohm, go to next step.
  14. Release short spring mechanism on instrument panel 4-pin connector A33. Measure resistance between Yellow/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. If resistance less than one megohm, replace wiring harness between passenger-side air bag module and instrument panel 4-pin connector A33. If resistance is more than one ohm, 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 .
  15. Disconnect instrument panel 4-pin connector A33, located near passenger-side air bag module. Measure resistance between Yellow/Red wire (circuit P2+) and Yellow/Green wire (circuit P2-) wire on harness side of instrument panel 4-pin connector A33. If resistance is more than one ohm, replace wiring harness between air bag sensor assembly and instrument panel 4-pin connector A33. If resistance is less than one ohm, go to next step.
  16. Measure resistance between Yellow/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. If resistance is more than one ohm, replace wiring harness between passenger-side air bag module and instrument panel 4-pin connector A33. If resistance is less than one ohm, 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 .
  17. Disconnect instrument panel 4-pin connector A33, located near passenger-side air bag module. Measure resistance between ground and Yellow/Red wire (circuit P2+) on harness side of instrument panel 4-pin connector A33. Measure resistance between ground and Yellow/Green wire (circuit P2-) on harness side of instrument panel 4-pin connector A33. If resistance is more than one megohm, replace wiring harness between air bag sensor assembly and instrument panel 4-pin connector A33. If resistance is less than one megohm, go to next step.
  18. Measure resistance between ground and Yellow/Gray wire on harness side of Orange passenger-side air bag module connector. Measure resistance between ground and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. If resistance is more than one megohm, replace wiring harness between passenger-side air bag module and instrument panel 4-pin connector A33. If resistance is less than one megohm, 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 .
  19. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Disconnect instrument panel 4-pin connector A33, located near passenger-side air bag module. Measure voltage between ground and Yellow/Red wire (circuit P2+) on harness side of instrument panel 4-pin connector A33. Measure voltage between ground and Yellow/Green wire (circuit P2-) on harness side of instrument panel 4-pin connector A33. If voltage is more than one volt, replace wiring harness between air bag sensor assembly and instrument panel 4-pin connector A33. If voltage is less than one volt, go to next step.
  20. Measure voltage between ground and Yellow/Gray wire on harness side of Orange passenger-side air bag module connector. Measure voltage between ground and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. If voltage is more than one volt, replace wiring harness between passenger-side air bag module and instrument panel 4-pin connector A33. If voltage is less than one volt, 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 .
  21. Restore short spring mechanism to original condition. Disconnect instrument panel 4-pin connector A33, located near passenger-side air bag module. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Red wire (circuit P2+) on harness side of instrument panel 4-pin connector A33. Measure voltage between ground and Yellow/Green wire (circuit P2-) on harness side of instrument panel 4-pin connector A33. 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/Red wire and Yellow/Green wire on harness side of instrument panel 4-pin connector A33. Resistance should be less than one ohm. Measure resistance between ground and Yellow/Red wire on harness side of instrument panel 4-pin connector A33. Measure resistance between ground and Yellow/Green wire on harness side of instrument panel 4-pin connector A33. Resistance should be more than one megohm. Release short spring mechanism on air bag sensor assembly connector A31. Measure resistance between Yellow/Red wire and Yellow/Green wire on harness side of instrument panel 4-pin connector A33. 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 wiring harness between air bag sensor assembly and instrument panel 4-pin connector A33.
  22. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Gray wire on harness side of Orange passenger-side air bag module connector. Measure voltage between ground and Yellow/Pink wire on harness side of Orange passenger-side air bag module 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/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. Resistance should be less than one ohm. Measure resistance between ground and Yellow/Gray wire on harness side of Orange passenger-side air bag module connector. Measure resistance between ground and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. Resistance should be more than one megohm. Release short spring mechanism on lower spiral cable connector. Measure resistance between Yellow/Gray wire and Yellow/Pink wire on harness side of Orange passenger-side air bag module connector. Resistance should be more than one megohm. If voltage and resistance readings are normal, 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 . If voltage and resistance readings are not normal, replace wiring harness between passenger-side air bag module and instrument panel 4-pin connector A33.
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