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Home >> Cadillac >> 2002 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Tests >> DTC B0077, B0078, B0079, B0080, B0081, B0082: Driver-Side Sis Valid Identification Message Not Received/Passenger-Side Sis Valid Identification Message Not Received/Driver-Side Sis Identification Error/Driver-Side Sis NOK Message/Passenger-Side Sis Identification Error/Passenger-Side Sis NOK Message >> Diagnostic Procedure
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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 SIR DIAGNOSTIC SYSTEM CHECK .
  2. Using scan tool, request SIR DTC display. If DTC B0079, B0080, B0081 or B0082 is retrieved as a current DTC, go to step  12. If DTC B0079, B0080, B0081 or B0082 is not retrieved as a current DTC, go to next step.
  3. Turn ignition off. If DTC B0077 is current, disconnect driver-side SIS connector. See SIDE IMPACT SENSOR (SIS)  under REMOVAL & INSTALLATION. If DTC B0078 is current, disconnect passenger-side SIS connector. If connector is damaged or corroded, go to next step. If connector is okay, go to step  5.
  4. If SIS side of connector is damaged, replace SIS. Go to step  13. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step  13.
    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.
  5. Disconnect SDM connector. See Figure. If SDM connector or SDM terminals show signs of corrosion, poor connections or other damage, replace SDM connector. See WIRE REPAIR . Go to step  13. If SDM connector is okay, go to next step.
  6. If DTC B0077 is current, disconnect driver-side SIS connector. If DTC B0078 is current, disconnect passenger-side SIS connector. Test high-side and low-side circuits of applicable SIS for a short to ground or an open or high resistance. If a short to ground or an open or high resistance is found and corrected, go to step  13. If a short to ground, an open or high resistance is not found, go to next step.
  7. Inspect applicable SIS circuits for a short to voltage. If a short to voltage is found and corrected, go to step  13. If short is not found, go to next step.
  8. Turn ignition on. Check applicable SIS circuits for a short to voltage. If short to voltage is found and corrected, go to step  13. If short to voltage is not found and corrected, go to next step.
  9. If DTC B0077 was displayed by scan tool, replace driver-side SIS. Go to next step. If DTC B0078 was displayed by scan tool, replace passenger-side SIS. Go to next step.
  10. Reconnect all SIR components. Using scan tool, clear DTC's. Road test vehicle, then check for DTC's. If DTC's are retrieved by scan tool, go to next step. If DTC's are not retrieved by scan tool, system is normal.
  11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM)  under REMOVAL & INSTALLATION. Go to step  13.
  12. If DTC B0079 or B0080 were retrieved by scan tool, replace driver-side SIS. See SIDE IMPACT SENSOR (SIS)  under REMOVAL & INSTALLATION. Go to next step. If DTC B0081 or B0082 were retrieved by scan tool, replace passenger-side SIS. Go to next step.
  13. 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 step  2. If DTC's are not retrieved, system is normal.
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