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Home >> Cadillac >> 2019 >> XT5 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B384A >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B70 Liftgate Close Switch
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: K39 Liftgate Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit 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 less than 10 ohms 
  4. Verify a test lamp turns On between the test points: Control circuit terminal 2 & Low Reference circuit terminal 1
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: K39 Liftgate Control Module
    3. Test for infinite resistance between the test points: Control 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: Control circuit terminal 2@Component harness & Terminal 13 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 
  5. Ignition/Vehicle - Off
  6. Connect the electrical connector: B70 Liftgate Close Switch
  7. Disconnect the electrical connector: K39 Liftgate Control Module
  8. Ignition - On / Vehicle - In Service Mode
  9. Test for less than 1 V between the test points:Control circuit terminal 13 & Ground
    • If 1 V or greater 
    1. Disconnect the electrical connector: B70 Liftgate Close Switch
    2. Test for less than 1 V between the test points: Control circuit terminal <p01>@ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: B70 Liftgate Close Switch
    • Go to next step: If less than 1 V 
  10. Test or replace the component: K39 Liftgate Control Module
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