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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (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 Avalon. 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. Reconnect negative battery cable.
  2. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector C6, terminal No. 9 (circuit SR+, Black/White wire). See Figure. Measure voltage between ground and air bag sensor assembly connector C6, terminal No. 20 (circuit SR-, Brown/White wire). If voltage is less than one volt, turn ignition switch to LOCK position and go to next step. If voltage is more than one volt, repair or replace harness or connector between front air bag sensor and air bag sensor assembly.
  3. Measure resistance between ground and air bag sensor assembly connector C6, terminal No. 9 (Black/White wire). Measure resistance between ground and air bag sensor assembly connector C6, terminal No. 20 (Brown/White wire). If resistance in both tests is more than one megohm, go to next step. If either resistance is less than one megohm, repair or replace harness or connector between front air bag sensor and air bag sensor assembly.
  4. Measure resistance between air bag sensor assembly connector C6, terminals No. 9 (Black/White wire) and No. 20 (Brown/White wire). 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 front air bag sensor and air bag sensor assembly.
  5. Connect jumper wire between Black/White and Brown/White wires of front air bag sensor harness connector. Measure resistance between air bag sensor assembly connector C6, terminals No. 9 (Black/White wire) and No. 20 (Brown/White wire). 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 front air bag sensor and air bag sensor assembly.
  6. With front air bag sensor disconnected, measure resistance across 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 C6. 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 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.
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