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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 B1578 - Liftgate Close Switch Malfunction >> Component Testing

Component Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B70 Liftgate Close Switch
  3. Test for infinite resistance between the test points: Signal terminal 3 & Low Reference terminal 1 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: B70 Liftgate Close Switch

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points: Signal terminal 3 & Low Reference terminal 1 - Switch - Pressed
    • If 3 ohms or greater 

      Replace the component: B70 Liftgate Close Switch

    • Go to next step: If less than 3 ohms 
  5. All OK.
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