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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B2494: Liftgate Handle Switch Malfunction (With TB5) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S46B Liftgate Unlatch Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal listed below and ground:
    • Low reference circuit terminal 2 (TC2)
    • Low reference circuit terminal 1 (TB5)
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the low reference connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Liftgate Handle Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module.
    2. Test for infinite resistance between the signal circuit terminal listed below and ground:
      • Signal circuit terminal 1 (TC2)
      • Signal circuit terminal 2 (TB5)
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K39 Liftgate Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal and the low reference circuit terminal listed below:
    • Signal circuit terminal 1 and low reference circuit terminal 2 (TC2)
    • Signal circuit terminal 2 and low reference circuit terminal 1 (TB5)
  6. Verify the scan tool Liftgate Handle Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the harness connector at the K39 Liftgate Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • 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 K39 Liftgate Control Module.
    • If Active 
  7. Test or replace the S46B Liftgate Unlatch Switch.
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