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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> DTC B0100, B0101, B0102: EFS Valid Identification Message Not Received/ EFS NOK Message/EFS Incorrect Identification >> Diagnostic Procedure

Diagnostic Procedure

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  1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .
  2. Using scan tool, request SIR DTC display. If DTC B0101 or B0102 is current, go to step  12. If DTC B0101 or B0102 is not current, go to next step.
  3. Turn ignition off. Disconnect EFS connector. See FRONT END DISCRIMINATING SENSOR  under REMOVAL & INSTALLATION. If connector shows signs of damage or corrosion, go to next step. If connector is okay, go to step  5.
  4. If EFS side of connector is damaged, replace EFS. Go to step  13. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step  13.
  5. Disconnect SDM connector. If SDM connector shows signs of damage or corrosion, replace connector. See WIRE REPAIR . Go to step  13. If SDM connector is okay, go to next step.
    NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.
  6. Inspect EFS signal circuit (Yellow wire) for a short to ground, an open or high resistance. If condition is found and corrected, go to step  13. If condition is not found, go to next step.
  7. Inspect EFS reference circuit (Tan/Orange wire) for a short to ground, an open or high resistance. If condition is found and corrected, go to step  13. If condition is not found, go to next step.
  8. Turn ignition on. Check EFS signal and reference circuits for a short to voltage. If a short to voltage is found and corrected, go to step  13. If a short to voltage is not found and corrected, go to next step.
  9. Replace EFS (front end discriminating sensor). See FRONT END DISCRIMINATING SENSOR  under REMOVAL & INSTALLATION. Go to next step.
  10. Reconnect all SIR components. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to next step. If DTC's are not retrieved, system is normal.
  11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to next step.
  12. Replace EFS (front end discriminating sensor). See FRONT END DISCRIMINATING SENSOR  under REMOVAL & INSTALLATION. Go to next step.
  13. Using scan tool, clear all SIR DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step  2. If DTC is not retrieved, system is normal.
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