Diagnostic Aids
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.
Inspect the motor shaft for rust or other foreign material which may prohibit proper motor operation.
If the motor operates properly please reinstall it and check for Preliminary Information or Technical Service Bulletins.