Chevrolet 2015 Impala Owner's Manual page 58

sunroof is open, the sunshade will
express close just short of the open
sunroof.
Anti-Pinch Feature
If an object is in the path of the
sunroof/sunshade when it is closing,
the anti-pinch feature will detect the
object and stop the sunroof/
sunshade from closing at the point
of the obstruction. The sunroof/
sunshade will then return to the
full-open position. To close the
sunroof/sunshade, see Express
Open/Express Close earlier in this
section.
Dirt and debris may collect on the
sunroof seal or in the track. This
could cause an issue with sunroof
operation or noise. It could also plug
the water drainage system.
Periodically open the sunroof and
remove any obstacles or loose
debris. Wipe the sunroof seal and
roof sealing area using a clean
cloth, mild soap, and water. Do not
remove grease from the sunroof.
If water is seen dripping into the
water drainage system, this is
normal.
Keys, Doors, and Windows 2-25