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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Liftgate Ajar Indicator Malfunction (TC2) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A23C Liftgate Latch.
  2. Ignition ON.
  3. Verify the scan tool Rear Gate Latch Unlatch Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K194 Rear Gate Module.
    2. Test for infinite resistance between the signal circuit terminal 6 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K194 Rear Gate Module.
    • Go to next step: If Inactive 
  4. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the low reference circuit terminal 5.
  5. Verify the scan tool Rear Gate Latch Unlatch Switch parameter is Active
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the K194 Rear Gate Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 6 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K194 Rear Gate Module.
    • Go to next step: If Active 
  6. Verify the scan tool Rear Gate Latch Primary Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K194 Rear Gate Module.
    2. Test for infinite resistance between the signal circuit terminal 7 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K194 Rear Gate Module.
    • Go to next step: If Inactive 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the low reference circuit terminal 5.
  8. Verify the scan tool Rear Gate Latch Primary Switch parameter is Active
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the K194 Rear Gate Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 7 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K194 Rear Gate Module.
    • Go to next step: If Active 
  9. Test or replace the A23C Liftgate Latch.
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