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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 31-B1100: Air Bag Sensor Assembly Malfunction >> Diagnostic Procedure

Diagnostic Procedure

  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 terminals No. 5 (circuit IG2, Gray-Black wire) and No. 6 (circuit ACC, Gray-Red wire). See Figure. If voltage is more than 10-14 volts, check battery and charging system operation. If voltage is 10-14 volts, go to next step.
  3. 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. Repeat at least 5 times. Retrieve DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 31-B1100 is displayed, replace air bag sensor assembly. If DTC 31-B1100 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
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