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Home >> GMC >> 2011 >> Terrain SLT, 2.4 C, AWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> Liftgate Object Sensor Malfunction - DTC B153F >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B71L liftgate object sensor - left.
  2. Test for less than 30 Ω between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.
  3. Disconnect the harness connector at the B71R liftgate object sensor - right
  4. Ignition ON, test for 4.75-5.25 V between the signal circuit terminal A and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K39 liftgate control module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K39 liftgate control module.
  5. Test for less than 10 Ω between the signal circuit terminal B at the B71R liftgate object sensor - right and the signal circuit terminal A at the B71L liftgate object sensor - left.
    • If greater than the specified range, test the signal circuit between the two sensors for an open/high resistance.
  6. If all circuits test normal, test or replace the B71L liftgate object sensors.
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