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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information And Procedures >> DTC B323A, B323B, Or B323C: Upper-Lower Hands Free Sensor Signal Invalid/Hands Free Liftgate Sensor Module >> Circuit/System Testing
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Circuit/System Testing

  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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