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Home >> Buick >> 2019 >> Regal Base >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> DTC B3618 >> Circuit/System Testing

Circuit/System Testing

    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: S46 Liftgate Handle Switch
  3. Test for less than 10 ohms between the test points:
    • {Station Wagon} Ground circuit terminal 1 & Ground
    • {Hatchback} Ground circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:
      • {Station Wagon} Ground circuit terminal 1 @ Component harness & Ground Connection
      • {Hatchback} Ground circuit terminal 3 @ Component harness & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Verify the component is not activated: A23C Liftgate Latch Assembly
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for infinite resistance between the test points:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Ground
      • {Hatchback} Signal circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  5. Connect a 3 A fused jumper wire between the test points:
    • {Station Wagon} Signal circuit terminal 2 & Ground circuit terminal 1
    • {Hatchback} Signal circuit terminal 1 & Ground circuit terminal 3
  6. Verify the component produces a clicking sound: A23C Liftgate Latch Assembly
    • If the component does not produce a sound 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Ground
      • {Hatchback} Signal circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:
      • {Station Wagon} Signal circuit terminal 2 @ Component harness & Terminal 15 X6 @ Control module harness
      • {Hatchback} Signal circuit terminal 1 @ Component harness & Terminal 15 X6 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • Go to next step: If the component produces a sound 
  7. Test or replace the component: S46 Liftgate Handle Switch
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