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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 33/B1141: Left Head Impact/Side Air Bag Sensor Assembly Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. 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 31/B1141 is not retrieved, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .. If DTC 33/B1141 is retrieved, go to next step.
  2. Access left head impact/side air bag sensor assembly. See HEAD IMPACT/SIDE AIR BAG SENSOR ASSEMBLIES  under REMOVAL & INSTALLATION. Ensure left head impact/side air bag sensor assembly harness connector is properly connected and secure. Reconnect if necessary. Go to next step.
  3. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.
  4. Disconnect left head impact/side air bag sensor assembly connector. Connect jumper wire between left head impact/side air bag sensor assembly harness connector terminals No. 1 (circuit VUPL, Pink/Blue wire) and No. 4 (circuit ESL, Gray/Blue wire). See WIRING DIAGRAMS . Measure resistance between air bag sensor assembly connector A23, terminals No. 16 (circuit VUPL, Pink/Blue wire) and No. 18 (circuit ESL, 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 head impact/side air bag sensor assembly and air bag sensor assembly.
  5. Connect jumper wire between left head impact/side air bag sensor assembly harness connector terminals No. 2 (circuit SSL+, Blue/White wire) and No. 3 (circuit SSL-, Light Green/Black wire). See WIRING DIAGRAMS . Measure resistance between air bag sensor assembly connector A23, terminals No. 17 (circuit SSL+, Blue/White wire) and No. 20 (circuit SSL-, Light Green/Black wire). See Figure. If resistance is less than one ohm, remove jumper wire and go to next step. If resistance is more than one ohm, repair or replace harness or connector between left head impact/side air bag sensor assembly and air bag sensor assembly.
  6. Measure resistance between ground and air bag sensor assembly harness connector A23, terminals No. 17 (circuit SSL+, Blue/White wire), No. 20 (circuit SSL-, Light Green/Black wire) and No. 16 (circuit VUPL, Pink/Blue wire) individually. See Figure. If resistance is more than one k/ohm, go to next step. If resistance is less than one k/ohm, repair or replace harness or connector between left head impact/side air bag sensor assembly and air bag sensor assembly.
  7. Connect negative battery cable. Turn ignition switch to ACC or ON position. Measure voltage between ground and air bag sensor assembly harness connector A23, terminals No. 17 (circuit SSL+, Blue/White wire), No. 20 (circuit SSL-, Light Green/Black wire), No. 16 (circuit VUPL, Pink/Blue wire) and No. 18 (circuit ESL, Gray/Blue wire) individually. If voltage is less than one volt, turn ignition switch to LOCK position, disconnect negative battery cable and go to next step. If voltage is more than one volt, repair or replace harness or connector between left head impact/side air bag sensor assembly and air bag sensor assembly. See WIRING DIAGRAMS .
  8. Ensure negative battery cable is disconnected. Reconnect air bag sensor assembly connector A23 and left head impact/side air bag sensor assembly 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 or 32/B1140 is not retrieved, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 33/B1141 is retrieved, replace air bag sensor assembly. If DTC 32/B1140 is retrieved, replace left head impact/side air bag sensor assembly.
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