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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 >> DTC B1574 or B1575 - Liftgate Interior Release Open/Close Switch Malfunction >> Component Testing

Component Testing

SS45B Liftgate Control Switch - Interior-Static Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S45B Liftgate Control Switch - Interior
  3. Test for infinite resistance between the test points: Signal terminal 4 & Ground terminal 1 - Not Pressed
    • If less than infinite resistance 

      Replace the component: S45B Liftgate Control Switch - Interior

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

      Replace the component: S45B Liftgate Control Switch - Interior

    • Go to next step: If less than 3 ohms 
  5. Test for 1k to 1.3k ohms between the test points: Signal terminal 3 & Ground terminal 1 - Switch S45B in position: Off
    • If not between 1k and 1.3k ohms 

      Replace the component: S45B Liftgate Control Switch - Interior

    • Go to next step: If between 1k and 1.3k ohms 
  6. Test for 11k to 13k ohms between the test points: Signal terminal 3 & Ground terminal 1 - Switch S45B in position: 3/4
    • If not between 11k and 13k ohms 

      Replace the component: S45B Liftgate Control Switch - Interior

    • Go to next step: If between 11k and 13k ohms 
  7. Test for 4k to 4.5k ohms between the test points: Signal terminal 3 & Ground terminal 1 - Switch S45B in position: Max
    • If not between 4k and 4.5k ohms 

      Replace the component: S45B Liftgate Control Switch - Interior

    • Go to next step: If between 4k and 4.5k ohms 
  8. All OK.