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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 72/B0138: Short To Battery In Driver-Side Seat Belt PRETENSIONER Squib Circuit >> 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. Disconnect driver-side seat belt pretensioner harness connector. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Access air bag sensor assembly and disconnect harness connector A12. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. See Figure. Turn ignition switch to ON position. Measure voltage between ground and Yellow/Black wire on harness side of driver-side seat belt pretensioner harness connector. See WIRING DIAGRAMS . If voltage more than one volt, repair or replace harness or connector between driver-side seat belt pretensioner and air bag sensor assembly. If voltage is less than one volt, go to next step.
  2. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect air bag sensor assembly connector A12 to air bag sensor assembly. Connect jumper wire between Yellow/Black wire and Yellow wire on harness side of driver-side seat belt pretensioner harness 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 DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 72/B0138 is not displayed, go to next step. If DTC 72/B0138 is displayed, replace air bag sensor assembly.
  3. Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect driver-side seat belt pretensioner 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 DTCs. See RETRIEVING CODES  under DIAGNOSTICS. If DTC 72/B0138 is not displayed, go to next step. If DTC 72/B0138 is displayed, replace driver-side seat belt pretensioner.
  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 .
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