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Circuit / System Testing

  1. Ignition OFF, disconnect the harness connector at the liftgate switch.
  2. Ignition OFF, test for less than 1.0 Ω of resistance between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open / high resistance.
  3. Ignition ON, verify the scan tool Ext Trunk / Liftglass Rel Sw parameter is Inactive.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Ext Trunk / Liftglass Rel Sw parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open / high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the liftgate switch.
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