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Home >> Buick >> 2021 >> Envision Preferred, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Vehicle Access System >> Diagnostic Information and Procedures >> Liftgate Release Malfunction (TB4) >> Component Testing

Component Testing

A23C Liftgate Latch-Dynamic Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: A23C Liftgate Latch
  3. Manually move the A23C Liftgate Latch to the Latched position
  4. Connect a jumper wire between the test points: control terminal 3 & Ground
  5. Momentarily connect a 15 A fused jumper wire between the test points: Control terminal 4 & 12 V

    Verify the A23C Liftgate Latch performs the Unlatch function

    • If the A23C Liftgate Latch does not Unlatch 

      Replace the component: A23C Liftgate Latch

    • Go to next step: If the A23C Liftgate Latch does Unlatch 
  6. All OK.

E7AC Rear License Plate Lamp Module

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: E7AC Rear License Plate Lamp Module
  3. Test for infinite resistance between the test points: Signal terminal 3 & Ground terminal 1 - Not Pressed
    • If less than infinite resistance 

      Replace the component: E7AC Rear License Plate Lamp Module

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

      Replace the component: E7AC Rear License Plate Lamp Module

    • Go to next step: If less than 3 ohms