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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Power Door Lock System And Release Systems >> Diagnostic Information And Procedures >> DTC B153A: Liftgate Latch Switch Signal Circuit >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On / Vehicle - In Service Mode
  2. Operate the component: Open the liftgate.

    Verify the scan tool parameter:

    • Body Control Module: Rear Closure Ajar Switch = Active
    • Liftgate Control Module: Liftgate Latch Pawl Switch = open
    • Liftgate Control Module: Liftgate Latch Ratchet Switch = open
    • Liftgate Control Module: Liftgate Latch Sector Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Operate the component: Liftgate - Close & A23C Liftgate Latch Assembly - Latching

    Verify the scan tool parameter:

    • Body Control Module: Rear Closure Ajar Switch = Active - Inactive
    • Liftgate Control Module: Liftgate Latch Pawl Switch = open - Closed
    • Liftgate Control Module: Liftgate Latch Ratchet Switch = open - Closed
    • Liftgate Control Module: Liftgate Latch Sector Switch = Inactive - Active - Inactive
    • If the parameter value does not change 

      Refer to: Circuit/System Testing

    • Go to next step: If the parameter value changes 
  4. Operate the component: S45B Liftgate Control Switch - Interior - 3/4orMaximum
  5. Perform the scan tool function: Liftgate Open/Close - open & Close

    Verify the component works as specified:

    • A23C Liftgate Latch Assembly - Unlatch
    • Power Liftgate (TB5) - open & Close
    • If the component does not work as specified: Power Liftgate (TB5) - open 

      Refer to: DTC B153E 

    • Go to next step: If the component opens and closes - Power Liftgate (TB5) 
  6. All OK.
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