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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 81 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 15/B1156 & B1157: Right Front Air Bag Sensor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect negative battery cable.
  2. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector C8, terminals No. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White wire). See Figure. If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  8.
  3. Measure resistance between ground and air bag sensor assembly connector C8, terminal No. 9 (circuit SR+, Black/White wire). If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  9.
  4. Measure resistance between air bag sensor assembly connector C8, terminal No. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White wire). If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  10.
  5. Connect fused jumper wire between across terminals of front air bag sensor harness connector. Measure resistance between air bag sensor assembly connector C8, terminal No. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White wire). If resistance is more than one megohm, go to next step. If resistance is less than one megohm, go to step  11.
  6. Measure resistance across front air bag sensor terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace front air bag sensor.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect front air bag sensor and air bag sensor assembly connector C8 (center connector). Connect negative battery cable. Wait at least 20 seconds. Turn ignition switch to ACC or ON position. 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 codes. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 15/B1156 or B1157 is displayed, replace air bag sensor assembly. If DTC 15/B1156 or B1157 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSTIC TESTS.
    NOTE: Front air bag sensor circuit Brown/White wire becomes Black wire at sub-harness connector. Front air bag sensor circuit Black/White wire becomes White wire at sub-harness connector.
  8. Disconnect right front air bag sensor circuit Yellow, 2-pin sub-harness connector. Sub-harness connector is located behind right hick panel. Measure voltage between ground and White wire (circuit SR+) and Black wire (circuit SR-) on front air bag sensor side of sub-harness connector individually. If voltage is less than one volt, go to next step. If voltage is more than one volt, repair or replace sub-harness between front air bag sensor and kick panel connector.
  9. Measure resistance between ground and White wire (circuit SR+) and Black wire (circuit SR-) on front air bag sensor side of sub-harness connector individually. If resistance is more than one megohm, repair or replace harness or connector between air bag sensor assembly and kick panel connector. If resistance is less than one megohm, repair or replace sub-harness between front air bag sensor and kick panel connector
  10. Disconnect right front air bag sensor circuit Yellow, 2-pin sub-harness connector. Sub-harness connector is located behind right hick panel. Measure resistance between White wire (circuit SR+) and Black wire (circuit SR-) on front air bag sensor side of sub-harness connector individually. If resistance is more than one megohm, repair or replace harness between air bag sensor assembly and kick panel connector. If resistance is less than one megohm, repair or replace sub-harness between front air bag sensor and kick panel connector.
  11. Connect fused jumper wire between across terminals of front air bag sensor harness connector. Disconnect right front air bag sensor circuit Yellow, 2-pin sub-harness connector. Sub-harness connector is located behind right hick panel. Measure resistance between White wire (circuit SR+) and Black wire (circuit SR-) on front air bag sensor side of sub-harness kick panel connector individually. If resistance is less than one megohm, repair or replace sub-harness between front air bag sensor and kick panel connector. If resistance is more than one megohm, repair or replace harness between air bag sensor assembly and kick panel connector.
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