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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (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 Toyota Sienna. 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. Leave right front air bag sensor connected.
  2. Measure resistance between air bag sensor assembly connector C5, terminals No. 9 (circuit SR+, Black/White wire) and No. 20 (circuit SR-, Brown/White wire). See Figure. If resistance is 754-886 ohms, go to next step. If resistance is not 754-886 ohms, go to step  6.
  3. Measure resistance between ground and air bag sensor assembly connector C5, terminal No. 9 (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. Connect negative battery cable. Wait 2 seconds. Measure voltage between ground and air bag sensor assembly connector C5, terminal No. 9 (Black/White wire). If voltage is less than one volt, go to next step. If voltage is more than one volt, go to step  11.
  5. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect right front air bag sensor. 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 DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 15/B1156/B1157 is displayed, replace air bag sensor assembly. If DTC 15/B1156/B1157 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSTIC TESTS.
  6. Disconnect right front air bag sensor connector. Measure resistance across sensor terminals. If resistance is 754-886 ohms, go to next step. If resistance is not 754-886 ohms, replace right front air bag sensor.
  7. Disconnect right front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at right cowl side panel. Measure resistance between Black/White and Brown/White wires of front air bag sensor harness connector. If resistance is more than one megohm, go to next step. If resistance is less than one megohm, replace front air bag sensor sub-harness between front air bag sensor and cowl side panel.
  8. Connect jumper wire between Black/White and Brown/White wires of front air bag sensor side of sub-harness connector located at right cowl side panel. Measure resistance between Black/White and Brown/White wires of front air bag sensor harness connector. If resistance is more than one ohm, replace sub-wire harness between front air bag sensor and cowl side panel. If resistance is less than one ohm, replace wire harness between air bag sensor assembly and sub-wire harness.
  9. Disconnect right front air bag sensor connector. Measure resistance between ground and air bag sensor assembly connector C5, terminal No. 9 (Black/White wire). Measure resistance between ground and air bag sensor assembly connector C5, terminal No. 20 (Brown/White wire). If resistance is less than one megohm, go to next step. If resistance is more than one megohm, replace right front air bag sensor.
  10. Disconnect right front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at right cowl side panel. Measure resistance between ground and Black/White and Brown/White wires of front air bag sensor side of sub-harness connector individually. If resistance is more than one megohm, replace harness or connector between air bag sensor assembly and sub-harness. If resistance is less than one megohm, replace sub-harness between front air bag sensor and cowl side panel.
  11. Disconnect right front air bag sensor connector. Measure voltage between ground and air bag sensor assembly connector C5, terminal No. 9 (Black/White wire). Measure voltage between ground and air bag sensor assembly connector C5, terminal No. 20 (Brown/White wire). If voltage is more than one volt, go to next step. If voltage is less than one volt, replace right front air bag sensor.
  12. Disconnect right front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at right cowl side panel. Measure voltage between ground and Black/White and Brown/White wires of front air bag sensor side of sub-harness connector individually. If voltage is more than one volt, replace sub-harness between front air bag sensor and cowl side panel. If voltage is less than one volt, replace harness or connector between air bag sensor assembly and sub-harness.
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