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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 21/B1620: Left Side Air Bag Sensor Malfunction >> 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. Reconnect air bag sensor assembly harness connectors. 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 21/B1620 is not displayed, system is functioning normally at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If DTC 21/B1620 is displayed, go to next step.
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Access air bag sensor assembly. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Access left side air bag sensor. See SIDE AIR BAG SENSOR  under REMOVAL & INSTALLATION. Ensure left side air bag sensor and air bag sensor assembly harness connectors are properly connected. If left side air bag sensor and air bag sensor assembly harness connectors are not properly connected, reconnect connectors. If left side air bag sensor and air bag sensor assembly harness connectors are properly connected, go to next step.
  3. Disconnect left side air bag sensor harness connector. Disconnect air bag sensor assembly harness connector A30. Connect jumper wire between Pink/Blue wire (circuit VUP L) and Black wire (circuit ESL) on harness side of left side air bag sensor harness connector. Measure resistance between air bag sensor assembly harness connector A30, terminals No. 19 and 21. 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 and air bag sensor assembly.
  4. Remove jumper wire. Measure resistance between air bag sensor assembly harness connector A30, terminals No. 19 and 21. 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 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 air bag sensor assembly harness connector A30, terminals No. 19 and 21. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair or replace harness or connector between left side air bag sensor and air bag sensor assembly.
  6. Measure resistance between ground and air bag sensor assembly harness connector A30, terminals No. 19 and 21. 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 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 60 seconds. Clear DTCs. 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 21/B1620 and 22/B1625 are not displayed, check for intermittent fault. If DTC 21/B1620 is displayed, replace air bag sensor assembly. If DTC 22/B1625 is displayed, replace left side air bag sensor.
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