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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> Power Liftgate Malfunction (Liftgate Object Sensor Malfunction) >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON, observe the scan tool Object Detection Sensor Status parameter. The reading should be between 3-3.5 V.
    • If not within the specified range, perform the Circuit/System Testing.
  2. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the liftgate object sensor - right. The reading should change from Inactive to Active as the sensor is pressed and released.
    • If the value does not change, test or replace the B71R liftgate object sensor - right.
  3. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the liftgate object sensor - left. The reading should change from Inactive to Active as the sensor is pressed and released.
    • If the value does not change, test or replace the B71L liftgate object sensor - left.
  4. Command the liftgate to power close by pressing the liftgate close switch and as the liftgate is closing, press the liftgate object sensor - right or the liftgate object sensor - left. The liftgate should stop and power open.
    • If the liftgate continues to power close, replace the K39 liftgate module.
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