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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Vehicle Access - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> Power Liftgate Malfunction >> Circuit/System Testing

Circuit/System Testing

Test 1

  1. Ignition/vehicle OFF, disconnect the connector at the S45A Liftgate Release Switch - Exterior
  2. Verify a test lamp illuminates between ground circuit terminal 2 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2050 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition/vehicle On.
  4. Verify the A23C Liftgate Latch is not Active
    • If Active 
    1. Test the circuit 5797 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If Inactive 
  5. Momentarily install a 3 A fused jumper wire between the signal circuit terminal 1 and ground.
  6. Verify the component produces a clicking sound: A23C Liftgate Latch
    • If the component does not produce a sound and the 3 A fuse is OK 
    1. Test the circuit 5797 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K9 Body Control Module.
    • If the component does not produce a sound and the 3 A fuse is open 
    1. Test the circuit 5797 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K9 Body Control Module.
    • Go to next step: If the component produces a sound 
  7. Replace the S45A Liftgate Release Switch - Exterior

Test 2

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B70 Liftgate Close Switch
  3. Verify a test lamp turns On between the test points: Low Reference terminal 1 & B+
    • If the test lamp does not turn On 
    1. Test circuit 4656 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K194 Rear Gate Module.
    • Go to next step: If the test lamp turns On 
  4. Ignition - On/Vehicle - In Service Mode
  5. Verify the scan tool Rear Gate Close Switch parameter is Inactive
    • If not Inactive 
    1. Test the circuit 4657 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the K194 Rear Gate Module.
    • Go to next step: If Inactive 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
  7. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 4657 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K194 Rear Gate Module.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 4657 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K194 Rear Gate Module.
    • Go to next step: If Active 
  8. Test or replace the component: B70 Liftgate Close Switch
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