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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 12/B0103: Driver-Side Air Bag Squib Circuit Short To Battery >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. 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. Connect negative battery cable.
  2. Measure voltage between ground and Yellow/Black wire on spiral cable side of upper spiral cable connector. See WIRING DIAGRAMS . If voltage is less than one volt, go to next step. If voltage more than one volt, go to step  6.
  3. Disconnect negative battery cable. Wait 90 seconds. Reconnect air bag sensor assembly connectors. Connect jumper wire between Yellow/Black wire and Yellow wire on spiral cable side of upper spiral cable 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 12/B0103 is retrieved, replace air bag sensor assembly. If DTC 12/B0103 is not retrieved, go to next step.
  4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect upper spiral cable connector (to driver-side air bag module). Reconnect 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 12/B0103 is retrieved, replace driver-side air bag module. If DTC 12/B0103 is not retrieved, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
  5. Disconnect lower spiral cable connector. Measure voltage between ground and Yellow/Black wire on spiral cable side of upper spiral cable connector. If voltage is less than one volt, go to next step. If voltage is more than one volt, replace spiral cable.
  6. Measure voltage between ground and Yellow/Black wire on air bag sensor assembly side lower spiral cable connector. If voltage is less than one volt, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If voltage is more than one volt, replace wiring harness between spiral cable and air bag sensor assembly.
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