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HOMESERVICE MANUALSBUICK2019ENVISION BASEREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL INFLATABLE RESTRAINT SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0091CIRCUIT/SYSTEM TESTING
2019 Buick Envision Base

Circuit/System Testing

2019 Buick Envision BaseSECTION Circuit/System Testing
  1. Ignition OFF.
  2. Disconnect the harness connector at the B59 Front Impact Sensor, wait 120 seconds.
  3. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If less than 10 Ω 
  4. Test for greater than 50k Ω between the signal circuit terminal 1 and ground.
    • If 50k Ω or less 
    1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If greater than 50k Ω 
  5. Disconnect the X2 harness connector at the Inflatable Restraint Sensing and Diagnostic Module.
  6. Test for less than 2 Ω between the B59 Front Impact Sensor signal circuit terminal 1 and the Inflatable Restraint Sensing and Diagnostic Module terminal 23 X2.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  7. Replace the B59 Front Impact Sensor.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.