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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag Restraint System >> Diagnostic Tests >> DTC 12: Driver-Side Air Bag Squib Circuit Short To Battery >> Diagnostic Procedure

Diagnostic Procedure

  1. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Connect negative battery cable.
  2. Measure voltage between ground and D+ (Yellow/Black wire) terminal of spiral cable side of spiral cable-to-air bag module connector. See Figure. If voltage is zero volt, go to next step. If voltage more than zero volt, go to step 5).
  3. Disconnect negative battery cable. Reconnect air bag sensor assembly connectors. Connect jumper wire between terminal D+ (Yellow/Black wire) and terminal D- (Yellow wire) of spiral cable side of spiral cable-to-air bag module 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 DIAGNOSIS & TESTING. 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 DIAGNOSIS & TESTING. If DTC 12 is displayed, replace air bag sensor assembly. If DTC 12 is not displayed, go to next step.
  4. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect spiral cable upper connector (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 DIAGNOSIS & TESTING. 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 DIAGNOSIS & TESTING. If DTC 12 is displayed, replace driver-side air bag module. If DTC 12 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 spiral cable side of spiral cable-to-air bag module connector. If voltage is zero volt, replace wiring harness between spiral cable and air bag sensor assembly. If voltage is more than zero volt, replace spiral cable.
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