Circuit/System Verification
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON.
- Verify DTC U0078 is not set.
- If DTC U0078 is set
Refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .
- Go to next step: If DTC U0078 is not set
- If DTC U0078 is set
- All OK