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Home >> Toyota >> 2000 >> 4Runner Base, 4WD >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag Restraint Systems >> Diagnostic Tests >> DTC 15-B1156 & B1157: Right Front Air Bag Sensor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect negative battery cable.
  2. Ensure right front air bag sensor is disconnected. Turn ignition switch to ON position. Measure voltage between ground and air bag sensor assembly connector C21, terminal No. 9 (circuit SR+, Black-White wire). See Figure. Measure voltage between ground and air bag sensor assembly connector C21, terminal No. 20 (circuit SR-, Brown-White wire). If voltage is more than one volt, repair or replace harness or connector between right front air bag sensor and air bag sensor assembly. If voltage is less than one volt, go to next step.
  3. Turn ignition switch to LOCK position. Measure resistance between ground and air bag sensor assembly connector C21, terminal No. 9 (circuit SR+, Black-White wire). Measure resistance between ground and air bag sensor assembly connector C21, terminal No. 20 (circuit SR-, Brown-White wire). If resistance is less than one megohm, repair or replace harness or connector between right front air bag sensor and air bag sensor assembly. If resistance is more than one megohm, go to next step.
  4. Measure resistance between air bag sensor assembly connector C21, terminals No. 9 (circuit SR+, Black-White wire) and No. 20 (circuit SR-, Brown-White wire). If resistance is less than one megohm, repair or replace harness or connector between right front air bag sensor and air bag sensor assembly. If resistance is more than one megohm, go to next step.
  5. Connect jumper wire between Black-White and Brown-White wires of air bag sensor assembly side of right front air bag sensor harness connector. Measure resistance between air bag sensor assembly connector C21, terminals No. 9 (circuit SR+, Black-White wire) and No. 20 (circuit SR-, Brown-White wire). If resistance is more than one ohm, repair or replace harness or connector between right front air bag sensor and air bag sensor assembly. If resistance is less than one ohm, go to next step.
  6. Measure resistance between right front air bag sensor terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace right front air bag sensor.
  7. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Connect air bag sensor assembly connector C21 (center connector). Connect right front air bag sensor connector. Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ACC or ON position. Wait at least 20 seconds. 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.
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