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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 262 (Air Bag Restraint Systems) >> Diagnostic Tests >> DTC 12/B0103: Driver-Side Air Bag Squib Module Circuit Short To Battery >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Toyota Matrix and 2004 Toyota Corolla. 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. Access driver-side air bag module and disconnect spiral cable harness connectors from air bag module. See DUAL-STAGE DRIVER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Access air bag sensor assembly and disconnect harness connector A13. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. See Figure. Measure voltage between ground and Yellow/Black wire (circuit D+) 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  5.
  2. Disconnect negative battery cable. Wait 90 seconds. Reconnect air bag sensor assembly connector A13. Connect jumper wire between Yellow/Black wire and Yellow wire (circuit D-) on spiral cable side of Orange upper spiral cable connector. 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.
  3. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect upper spiral cable connectors (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, go to next step.
  4. Check for intermittent air bag system fault. See AIR BAG WARNING LIGHT INTERMITTENT . If AIR BAG warning light illuminates while checking for intermittent fault, go to step  1. If AIR BAG warning light does not illuminate while checking for intermittent fault, replace all air bag system components, including wiring harness. See REMOVAL & INSTALLATION .
  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 zero volt, go to next step. If voltage is more than zero volt, replace spiral cable.
  6. Measure voltage between ground and Yellow/Black wire on 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.
  7. Check for intermittent air bag system fault. See AIR BAG WARNING LIGHT INTERMITTENT . If AIR BAG warning light illuminates while checking for intermittent fault, go to step  1. If AIR BAG warning light does not illuminate while checking for intermittent fault, replace all air bag system components, including wiring harness. See REMOVAL & INSTALLATION .
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