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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Power Door Lock System And Release Systems >> Diagnostic Information and Procedures >> DTC B153E: 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: X2 @ 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 Ω between the test points: Low Reference circuit terminal 2 @ Component harness & Terminal 11 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K39 Liftgate Control Module.
    • 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.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: 12 V Reference circuit terminal 1 @ Component harness & Terminal 8 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: Signal circuit terminal 3 @ Component harness & Terminal 9 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K39 Liftgate Control Module.
    • If greater than 11 V 
  7. Test for greater than 11 V between the Position Sensor Signal 2 circuit terminal 8 and ground.
    • If 11 V or less 
    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.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: Signal circuit terminal 4 @ Component harness & Terminal 10 @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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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