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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Power Door Locks And Vehicle Access - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC B176B (Tb4) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/vehicle OFF, disconnect the connector at the S141 Liftgate Window 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 M33 Liftgate Window Latch is not Active
    • If Active 
    1. Test the circuit 6190 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 K219 Lighting 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: M33 Liftgate Window Latch
    • If the component does not produce a sound and the 3 A fuse is OK 
    1. Test the circuit 6190 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 K219 Lighting Control Module.
    • If the component does not produce a sound and the 3 A fuse is open 
    1. Test the circuit 6190 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 K219 Lighting Control Module.
    • Go to next step: If the component produces a sound 
  7. Replace the S141 Liftgate Window Release Switch - Exterior