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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 55/B1820, 55/B1821, 55/B1822, 55/B1823: Left Side Air Bag 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 B1820 is retrieved, go to next step. If DTC B1821 is retrieved, go to step  3. If DTC B1822 is retrieved, go to step  4. If DTC B1823 is retrieved, go to step  5. If using diagnosis check wire, retrieve 2 digit DTC. See RETRIEVING AIR BAG SYSTEM DTCS USING DIAGNOSIS CHECK WIRE  under DIAGNOSTICS. If DTC 55 is retrieved, go to step  6.
  2. Release short spring mechanism on air bag sensor assembly connector A30. See RELEASING SHORTING SPRING  under DIAGNOSTICS. Measure resistance between Yellow/Red wire (circuit SFD+) and Yellow/Green wire (circuit SFD-) on harness side of left side curtain air bag module connector. See WIRING DIAGRAMS . If resistance is less than one megohm, replace wire harness between left side air bag module and air bag sensor assembly. If resistance is more than one megohm, go to step  8.
  3. Measure resistance between Yellow/Red wire (circuit SFD+) and Yellow/Green wire (circuit SFD-) on harness side of left side curtain air bag module connector. See WIRING DIAGRAMS . If resistance is less than one ohm, go to step  9. If resistance is more than one ohm, replace wire harness between left side air bag module and air bag sensor assembly.
  4. Measure resistance between ground and Yellow/Red wire (circuit SFD+) on harness side of left side curtain air bag module connector. See WIRING DIAGRAMS . Measure resistance between ground and Yellow/Green (circuit SFD-) wire on harness side of left side curtain air bag module connector. If resistance is more than one megohm, go to step  9. If resistance is less than one megohm, replace wire harness between left side air bag module and air bag sensor assembly.
  5. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Red wire (circuit SFD+) on harness side of left side curtain air bag module connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow/Green wire (circuit SFD-) on harness side of left side curtain air bag module connector. If voltage is less than one volt, go to step  9. If voltage is more than one volt, replace wire harness between left side air bag module 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/Red wire (circuit SFD+) on harness side of left side curtain air bag module connector. See WIRING DIAGRAMS . Measure voltage between ground and Yellow/Green wire (circuit SFD-) on harness side of left side curtain 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/Red wire and Yellow/Green wire on harness side of left side curtain air bag module connector. Resistance should be less than one ohm. Measure resistance between ground and Yellow/Red wire on harness side of left side curtain air bag module connector. Measure resistance between ground and Yellow/Green wire on harness side of left side curtain 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/Red wire and Yellow/Green wire on harness side of left side curtain 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, replace wire harness between left side air bag module and air bag sensor assembly.
  7. Replace left side air bag module. See 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 55 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC 55 is not displayed, test is complete.
  8. 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 B1820 is displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1820 is not displayed, go to step  10.
  9. 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/Red wire and Yellow/Green wire on harness side of left side curtain 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 B1821, B1822 or B1823 are displayed, replace air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. If DTC B1821, B1822 or B1823 are not displayed, go to next step.
  10. 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 B1820, B1821, B1822 or B1823 are displayed, replace left side air bag module. See SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. If DTC B1820, B1821, B1822 or B1823 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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