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Circuit/System Testing

  1. Ignition/Vehicle & All vehicle systems» Off
    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.
  2. Disconnect the electrical connector: S46B Liftgate Unlatch Switch
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 2 & Ground
    • If 10 Ω or greater 
    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 16 X1 @ 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 less than 10 Ω 
  4. Ignition» On / Vehicle» In Service Mode
  5. Verify the scan tool parameter: Liftgate Handle Switch=Inactive
    • If not the specified state 
    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 1 @ Component harness & Ground
      • If less than infinite resistance» Repair the short to ground on the circuit.
      • If infinite resistance» Replace the component: K39 Liftgate Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2
  7. Verify the scan tool parameter: Liftgate Handle Switch=Active
    • If not the specified state 
    1. Ignition/Vehicle» Off & Remove» Jumper wire(s)
    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 1 @ Component harness & Ground
      • If 1 V or greater» Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component harness & Terminal 14 X1 @ 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 the specified state 
  8. Test or replace the component:S46B Liftgate Unlatch Switch
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