Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On/Vehicle - In Service Mode
Verify that no DTCs are set.
- If any DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC is set
Verify the component turns On and Off: Lane Departure Warning Indicator
- Lane Departure Warning Switch
- If the component does not turn On and Off
  Refer to: DTC B0987
- Go to next step: If the component turns On and Off
All OK.