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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Liftgate Handsfree Sensor Malfunction >> Circuit/System Testing

Circuit/System Testing

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  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

    • 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

    • If less than 1 Ω 
  5. If all circuits test normal, replace the K171 Hands-Free Liftgate Sensor Control Module.
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