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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 76 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 31/B1100: Air Bag Sensor Assembly Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. 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 A18 (center connector), terminals No. 5 (circuit IG2, Black/Orange wire) and No. 6 (circuit ACC, Gray wire) independently. See Figure. If voltage is not 10-14 volts, check battery and charging system operation. If voltage is 10-14 volts, go to next step.
  3. Turn ignition switch to OFF position. Disconnect negative battery cable. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Clear DTCs. See CLEARING CODES  under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Repeat at least 5 times, then 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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