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Home >> Buick >> 2020 >> Envision Base >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> DTC B153F - Liftgate Object Sensor Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B71R Liftgate Object Sensor - Right
  3. Verify a test lamp turns On between the test points: Low Reference terminal 1 & B+
    • If the test lamp does not turn On 
    1. Disconnect the electrical connector: K39 Liftgate Control Module
    2. Test for less than 2 ohms between the test points: Low Reference terminal 1 @ Component harness & Terminal 16 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • Go to next step: If the test lamp turns On 
  4. Ignition - On / Vehicle - In Service Mode
  5. Disconnect the electrical connector: B71L Liftgate Object Sensor - Left
  6. Ignition - On / Vehicle - In Service Mode
  7. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 2 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 2 @ Component harness & Terminal 8 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K39 Liftgate Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K39 Liftgate Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  8. Test or replace the component: B71R Liftgate Object Sensor - Right or B71L Liftgate Object Sensor - Left
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