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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 B153E: Liftgate Position Sensor Signal Circuit (Liftgate Angle Sensor Malfunction) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X1 @ M17 Liftgate Motor Assembly
  3. Verify a test lamp turns On between the test points: Low Reference circuit terminal 2 & 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 circuit terminal 2 @ Component harness & Terminal 11 @ 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. Test for greater than 11 V between the test points: 12 V Reference circuit terminal 1 & Low Reference circuit terminal 2
    • If less than 11 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: 12 V Reference circuit terminal 1 @ 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: 12 V Reference circuit terminal 1 @ Component harness & Terminal 8 @ 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 11 V 
  6. Test for greater than 11 V between the test points: Signal circuit terminal 3 & Low Reference circuit terminal 2
    • If less than 11 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 3 @ 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 3 @ Component harness & Terminal 9 @ 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 11 V 
  7. Test for greater than 11 V between the test points: Signal circuit terminal 4 & Low Reference circuit terminal 2
    • If less than 11 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 4 @ 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 4 @ Component harness & Terminal 10 @ 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 11 V 
  8. Test or replace the component: M17 Liftgate Motor Assembly
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