Replacing Sunroof/Moonroof Switch on Impala V6-38L SC VIN 1 - Service Instructions
Tighten the front sunroof window panel screws to 4 N.m (35 lb in).
8. Install the sunroof module, but do not install the headliner until after you have tested the sunroof operation.
9. Inspect the operation of the sunroof.
10. Install the headliner.