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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.
  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 50 kΩ between the signal circuit terminal 1 and ground.
    • If 50 kΩ 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 50 kΩ 
  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.
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