Circuit/System Verification
WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On/Vehicle - In Service Mode
- 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
- 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
- Operate the component: S45B Liftgate Control Switch - Interior - 3/4 or Maximum
- 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 - Liftgate Angle Sensor Malfunction
- Go to next step: If the component opens and closes - Power Liftgate (TB5)
- All OK.