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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 33/B1141: Left-Side Air Bag Sensor Assembly Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to ACC or On position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 33/B1141 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 33/B1141 is displayed, go to next step.
  2. Access left-side air bag sensor assembly. See SIDE AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Ensure left-side air bag sensor assembly harness connector is properly connected and secure. Go to next step.
  3. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.
  4. Disconnect left-side air bag sensor assembly connector. Connect jumper wire between left-side air bag sensor assembly harness connector terminals No. 2 (circuit SSL+, Blue/White wire) and No. 4 (circuit ESL, Gray/Blue wire). See WIRING DIAGRAMS . Measure resistance between air bag sensor assembly connector C4, terminals No. 10 (Blue/White wire) and No. 9 (Gray/Blue wire). See Figure. 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-side air bag sensor assembly and air bag sensor assembly.
  5. Connect jumper wire between left-side air bag sensor assembly harness connector terminals No. 1 (circuit VUPL, Pink/Blue wire) and No. 3 (circuit FSL, Light Green/Black wire). See WIRING DIAGRAMS . Measure resistance between air bag sensor assembly connector C4, terminals No. 7 (Pink/Blue wire) and 12 (Light Green/Black wire). See Figure. 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-side air bag sensor assembly and air bag sensor assembly.
  6. Measure resistance between ground and air bag sensor assembly harness connector C4, terminals No. 7 (Pink/Blue wire), No. 10 (Blue/White wire) and No. 12 (Light Green/Black wire) individually. See Figure. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, repair or replace harness or connector between left-side air bag sensor assembly and air bag sensor assembly. See WIRING DIAGRAMS .
  7. Connect negative battery cable. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly harness connector C4, terminals No. 7 (Pink/Blue wire), No. 10 (Blue/White wire), No. 12 (Light Green/Black wire) and No. 9 (Gray/Blue wire) individually. See Figure. If voltage is zero volt, turn ignition switch to LOCK position, disconnect negative battery cable and go to next step. If voltage is more than zero volt, repair or replace harness or connector between left-side air bag sensor assembly and air bag sensor assembly. See WIRING DIAGRAMS .
  8. Ensure negative battery cable is disconnected. Reconnect left-side air bag sensor connector. Reconnect air bag sensor connector C4. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 33/B1141 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 33/B1141 is displayed, go to next step.
  9. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Disconnect left-side air bag sensor connector. Connect right-side air bag sensor to left-side air bag sensor connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 33/B1141 is not displayed, go to next step. If DTC 33/B1141 is displayed, replace air bag sensor assembly.
  10. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect left-side air bag sensor to right-side air bag sensor connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 32/B1140 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 32/B1140 is displayed, replace left-side air bag sensor assembly.
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