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Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the K171 Hands-Free Liftgate Sensor Control Module.
  2. Test for less than 1 Ω between the B275A Hands-Free Liftgate Sensor - Upper signal circuit terminal 1 and the signal circuit terminal 2.
    • If 1 Ω or greater 
    • Replace the B275A Hands-Free Liftgate Sensor - Upper
    • Go to next step: If less than 1 Ω 
  3. Ignition OFF, disconnect the X3 harness connector at the K171 Hands-Free Liftgate Sensor Control Module.
  4. Test for less than 1 Ω between the B275B Hands-Free Liftgate Sensor-Lower signal circuit terminal 1 and the signal circuit terminal 2.
    • If 1 Ω or greater 
    • Replace the B275B Hands-Free Liftgate Sensor-Lower
    • Go to next step: If less than 1 Ω 
  5. If all circuits test normal, replace the K171 Hands-Free Liftgate Sensor Control Module.
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