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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 12/B0103: Driver-Side Air Bag Module Squib Circuit Short To Battery >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Sequoia. 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. Turn ignition switch to ON position.
  2. Measure voltage between ground and spiral cable side of upper spiral cable connector Yellow/Black wire (circuit D+). See WIRING DIAGRAMS . If voltage is zero volt, turn ignition switch to LOCK position and go to next step. If voltage more than zero volt, go to step  5.
  3. Disconnect negative battery cable. Reconnect air bag sensor assembly connector A20 (center connector). Connect jumper wire between upper spiral cable connector Yellow/Black wire (circuit D+) and Yellow wire (circuit D-). Connect negative battery cable. Wait at least 2 seconds. Turn ignition switch to 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 ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 12/B0103 is displayed, replace air bag sensor assembly. If DTC 12/B0103 is not displayed, 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 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 ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 12/B0103 is displayed, replace driver-side air bag module. If DTC 12/B0103 is not displayed, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
  5. Disconnect spiral cable lower connector. Measure voltage between ground and terminal D+ (Yellow/Black wire) of upper spiral cable connector. If voltage is zero volt, go to next step. If voltage is more than zero volt, replace spiral cable.
  6. Measure voltage between ground and terminal D+ (Yellow/Black wire) of air bag sensor assembly side of lower spiral cable connector. If voltage is zero volt, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT . If voltage is more than zero volt, replace wiring harness between spiral cable and air bag sensor assembly.
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