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Home >> Isuzu >> 2002 >> Axiom Base, RWD >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Air Bag Restraint Systems >> Diagnostic Tests >> DTC 26: Driver Deployment Loop Open >> Diagnostic Procedure

Diagnostic Procedure

  1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to SRS DIAGNOSTIC SYSTEM CHECK .
  2. Use scan tool DATA LIST function to read and record driver differential voltage. If voltage is greater than 4.25 volts, go to next step. If voltage is 4.25 volts or less, go to SDM INTEGRITY CHECK .
  3. Turn ignition off. Ensure SRS coil Yellow 2-pin connector, located at base of steering wheel is seated properly. If okay, go to next step. If not seated properly, correct and go to step  8.
  4. Turn ignition off. Disconnect and inspect SRS coil Yellow 2-pin connector, located at base of steering column. If connector is okay, reconnect and turn ignition on. If DTC 26 is current, go to next step. If DTC 26 is not current, turn ignition off and go to step  8.
  5. Disconnect driver-side and passenger-side air bag Yellow 2-pin connectors, located at base of steering column and behind glove box assembly. Connect SRS Driver/Passenger Load Tool (J-41433) and appropriate adapters to driver-side and passenger-side air bag assembly harness connectors. Turn ignition on. If DTC 26 is current, go to next step. If DTC 26 is not current, go to step  7.
    NOTE: Use Digital Multimeter (J-39200) and Terminal Adapter Kit (J-35616-A) when performing electrical tests.
  6. Turn ignition off. Using digital multimeter in high resolution mode, check for open in driver deployment loop circuits IB05 (Yellow wire) and IB06 (Yellow/Black wire) and SDM connector terminals No. 3 (Yellow wire) and 4 (Yellow/Black wire). See Figure. If a fault is found, replace SRS harness and go to next step. If fault is not found, go to SDM INTEGRITY CHECK .
  7. Disconnect SRS driver/passenger load tool from SRS coil assembly harness connector. Remove driver-side air bag module. See AIR BAG ASSEMBLIES  under REMOVAL & INSTALLATION. Connect SRS driver/passenger load tool to Yellow 2-pin connector. Reconnect SRS coil assembly harness connector at base of steering column. Turn ignition on. If DTC 26 is current, replace SRS coil assembly. See SRS COIL ASSEMBLY  under REMOVAL & INSTALLATION. Go to next step. If DTC 26 is not current, replace driver-side air bag. See AIR BAG ASSEMBLIES  under REMOVAL & INSTALLATION. Go to next step.
  8. Reconnect all SRS components. Ensure all components are properly mounted. Using scan tool, clear DTC's. Go to SRS DIAGNOSTIC SYSTEM CHECK .
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