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Home >> Chevrolet >> 2018 >> Traverse L >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Vehicle Access System) >> Diagnostic Information and Procedures >> Liftgate Handsfree Sensor Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Traverse. 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 V between the B275A Hands-Free Liftgate Sensor - Upper signal circuit terminal 1 and ground
    • If 1 V or greater 

      Replace the B275A Hands-Free Liftgate Sensor - Upper

    • Go to next step: If less than 1 V 
  3. Test for less than 1 V between the B275A Hands-Free Liftgate Sensor - Upper signal circuit terminal 2 and ground
    • If 1 V or greater 

      Replace the B275A Hands-Free Liftgate Sensor - Upper

    • Go to next step: If less than 1 V 
  4. Test for infinite resistance between the B275A Hands-Free Liftgate Sensor - Upper signal circuit terminal 1 and ground.
    • If not the specified value 

      Replace the B275A Hands-Free Liftgate Sensor - Upper

    • Go to next step: If infinite resistance 
  5. Test for infinite resistance between the B275A Hands-Free Liftgate Sensor - Upper signal circuit terminal 2 and ground.
    • If not the specified value 

      Replace the B275A Hands-Free Liftgate Sensor - Upper

    • Go to next step: If infinite resistance 
  6. 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 
  7. Ignition OFF, disconnect the X3 harness connector at the K171 Hands-Free Liftgate Sensor Control Module.
  8. Test for less than 1 V between the B275B Hands-Free Liftgate Sensor - Lower signal circuit terminal 1 and ground
    • If 1 V or greater 

      Replace the B275B Hands-Free Liftgate Sensor - Lower

    • Go to next step: If less than 1 V 
  9. Test for less than 1 V between the B275B Hands-Free Liftgate Sensor - Lower signal circuit terminal 2 and ground
    • If 1 V or greater 

      Replace the B275B Hands-Free Liftgate Sensor - Lower

    • Go to next step: If less than 1 V 
  10. Test for infinite resistance between the B275B Hands-Free Liftgate Sensor - Lower signal circuit terminal 1 and ground.
    • If not the specified value 

      Replace the B275B Hands-Free Liftgate Sensor - Lower

    • Go to next step: If infinite resistance 
  11. Test for infinite resistance between the B275B Hands-Free Liftgate Sensor - Lower signal circuit terminal 2 and ground.
    • If not the specified value 

      Replace the B275B Hands-Free Liftgate Sensor - Lower

    • Go to next step: If infinite resistance 
  12. 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 
  13. If all circuits test normal, replace the K171 Hands-Free Liftgate Sensor Control Module.
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