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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 14/B1615: Left Front 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. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 60 seconds. Clear Diagnostic Trouble Codes (DTCs). See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. Turn ignition switch to LOCK position. Turn ignition switch to ON position. Wait at least 60 seconds. Retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES (DTCS)  under DIAGNOSTICS. If DTC 14/B1615 is displayed, go to next step. If DTC 14/B1615 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable and wait at least 90 seconds. Inspect air bag sensor assembly for proper connection of harness connectors. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Access left front air bag sensor and inspect for proper connection of harness connector. See FRONT AIR BAG SENSOR  under REMOVAL & INSTALLATION. If left front air bag sensor and air bag sensor assembly connectors are not properly connected, reconnect connectors and go to step  1. If left front air bag sensor and air bag sensor assembly connectors are properly connected, go to next step.
  3. Disconnect air bag sensor assembly harness connector A31. Connect jumper wire between White/Red wire (circuit SL+) and Brown wire (circuit SL-) on harness side of front air bag sensor connector. Measure resistance between harness air bag sensor assembly connector A31, terminals No. 30 (White/Red wire) and No. 28 (Brown wire). See Figure. If resistance is more then one ohm, go to step  8. If resistance is less than one ohm, go to next step.
  4. Remove jumper wire. Measure resistance between harness side air bag sensor assembly connector A31, terminals No. 30 (White/Red wire) and No. 28 (Brown wire). If resistance is less then one megohm, go to step  9. If resistance is more than one megohm, go to next step.
  5. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Measure voltage between ground and harness side air bag sensor assembly connector A31, terminals No. 30 (White/Red wire) and No. 28 (Brown wire). If voltage is more than one volt, go to step  10. If voltage is less then one volt, go to next step.
  6. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Measure resistance between ground and harness side of air bag sensor assembly connector A31, terminals No. 30 (White/Red wire) and No. 28 (Brown wire). If resistance is less then one megohm, go to step  11. If resistance is more than one megohm, go to next step.
  7. Connect air bag sensor assembly connector A31. Remove left and right front air bag sensors. Install left front air bag sensor on right side and connect to right front air bag sensor harness connector. Install right front air bag sensor on left side and connect to left front 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 14/B1615 and 13/B1610 are not displayed, system is operating normally at this time. Check for intermittent fault. If DTC 14/B1615 is displayed, replace air bag sensor assembly. If DTC 13/B1610 is displayed, replace left front air bag sensor. If no DTCs are displayed, fault is intermittent. Check for intermittent fault.
  8. Disconnect engine room main wire harness connector from instrument panel harness connector, located on left side of steering column tube. See WIRING DIAGRAMS . Measure resistance between White/Red wire and Brown wire on harness side of engine room main wire harness connector. If resistance is more then one ohm, replace engine room main wire harness. If resistance is less than one ohm, replace instrument panel harness.
  9. Disconnect engine room main wire harness connector from instrument panel harness connector, located on left side of steering column tube. See WIRING DIAGRAMS . Measure resistance in White/Red wire and Brown wire on harness side of engine room main wire harness connector. If resistance is less then one megohm, replace engine room main wire harness. If resistance is more than one megohm, replace instrument panel harness.
  10. Disconnect engine room main wire harness connector from instrument panel harness connector, located on left side of steering column tube. See WIRING DIAGRAMS . Measure voltage between White/Red wire and Brown wire on harness side of engine room main wire harness connector. If voltage is more than one volt, replace instrument panel harness. If voltage is less then one volt, replace engine room main wire harness.
  11. Disconnect engine room main wire harness connector from instrument panel harness connector, located on left side of steering column tube. See WIRING DIAGRAMS . Measure resistance in White/Red wire between ground and harness side of engine room main wire harness connector. Measure resistance in Brown wire between ground and harness side of engine room main wire harness connector. If resistance is less then one megohm, replace engine room main wire harness. If resistance is more than one megohm, replace instrument panel harness.
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