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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (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 Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 33/B1141 is not displayed, system is functioning normally at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 33/B1141 is displayed, go to next step.
  2. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Ensure air bag sensor assembly harness connectors are properly connected. If air bag sensor assembly harness connectors are not properly connected, reconnect connectors. If air bag sensor assembly harness connectors are properly connected, go to next step.
  3. 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. If left-side air bag sensor assembly harness connector is not properly connected, reconnect connector. If left-side air bag sensor assembly harness connector is properly connected, go to next step.
  4. Disconnect left-side air bag sensor assembly harness connector. Disconnect air bag sensor assembly harness connector A16. Connect jumper wire between Pink/Blue wire (circuit VUPL) and Light Green/Blue wire (circuit SSL-) and between Gray/Blue wire (circuit ESL) and Blue/White wire (circuit SSL+) on harness side of left-side air bag sensor assembly harness connector. Measure resistance between air bag sensor assembly harness connector A16, terminals No. 7 and 12 and between terminals No. 9 and 10. 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. Remove jumper wires from left-side air bag sensor assembly harness connector. Measure resistance between ground and air bag sensor assembly harness connector A16, terminals No. 7, 10 and 16. If resistance is more than one megohm in all circuits, go to next step. If resistance is less than one megohm in any circuit, repair or replace harness or connector between left-side air bag sensor assembly and air bag sensor assembly.
  6. Connect negative battery cable. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly harness connector A16, terminals No. 7, 10 and 16. If voltage is less than one volt in all circuits, go to next step. If voltage is more than one volt in any circuit, repair or replace harness or connector between left-side air bag sensor assembly and air bag sensor assembly.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Remove right and left-side air bag sensors. Install right-side air bag sensor on left side and connect to left-side air bag sensor harness connector. Install left-side air bag sensor on right side and connect to right-side air bag sensor 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 33/B1141 and 32/B1140 are not displayed, go to next step. If DTC 32/B1140 is displayed, replace air bag sensor assembly. If DTC 33/B1141 is displayed, replace left-side air bag sensor assembly.
  8. Check for intermittent air bag system fault. 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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