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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 16-B1158 & B1159: Left 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 left 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. 15 (circuit SL+, White-Red wire). See Figure. Measure voltage between ground and air bag sensor assembly connector C21, terminal No. 26 (circuit SL-, Brown-Yellow wire). If voltage is more than one volt, go to step  8. 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. 15 (circuit SL+, White-Red wire). Measure resistance between ground and air bag sensor assembly connector C21, terminal No. 26 (circuit SL-, Brown-Yellow wire). If resistance is less than one megohm, go to step  9. If resistance is more than one megohm, go to next step.
  4. Measure resistance between air bag sensor assembly connector C21, terminals No. 15 (circuit SL+, White-Red wire) and No. 26 (circuit SL-, Brown-Yellow wire). If resistance is less than one megohm, go to step  10. If resistance is more than one megohm, go to next step.
  5. Connect jumper wire between White-Red and Brown-Yellow wires of air bag sensor assembly side of left front air bag sensor harness connector. Measure resistance between air bag sensor assembly connector C21, terminals No. 15 (circuit SL+, White-Red wire) and No. 26 (circuit SL-, Brown-Yellow wire). If resistance is more than one ohm, go to step  10. If resistance is less than one ohm, go to next step.
  6. Measure resistance between left front air bag sensor terminals. If resistance is 300-1500 ohms, go to next step. If resistance is not 300-1500 ohms, replace left 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 left 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 16-B1158 or B1159 is displayed, replace air bag sensor assembly. If DTC 16-B1158 or B1159 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT  under DIAGNOSTIC TESTS.
  8. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at left kick panel. Measure voltage between ground and White-Red wire of front air bag sensor side of Yellow 2-pin sub-harness connector. Measure voltage between ground and Brown-Yellow wire of front air bag sensor side of Yellow 2-pin sub-harness connector. If voltage is more than one volt, replace sub-harness between left front air bag sensor and kick panel. If voltage is less than one volt, repair or replace harness or connector between air bag sensor assembly and kick panel.
  9. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at left kick panel. Measure resistance between ground and White-Red wire of front air bag sensor side of Yellow 2-pin sub-harness connector. Measure resistance between ground and Brown-Yellow wire of front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance is less than one megohm, replace sub-harness between left front air bag sensor and kick panel. If resistance is more than one megohm, repair or replace harness or connector between air bag sensor assembly and kick panel.
  10. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at left kick panel. Measure resistance between White-Red and Brown-Yellow wires of front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance is less than one megohm, replace sub-harness between left front air bag sensor and kick panel. If resistance is more than one megohm, repair or replace harness or connector between air bag sensor assembly and kick panel.
  11. Disconnect left front air bag sensor Yellow 2-pin sub-harness connector. Connector is located at left kick panel. Connect jumper wire between White-Red and Brown-Yellow wires of left front air bag sensor harness connector. Measure resistance between White-Red and Brown-Yellow wires of front air bag sensor side of Yellow 2-pin sub-harness connector. If resistance is less than more ohm, replace sub-harness between left front air bag sensor and kick panel. If resistance is less than one ohm, repair or replace harness or connector between air bag sensor assembly and kick panel.
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