Toyota Lexusc Owner's Handbook Manual page 170

To operate the moon roof, the ignition key must be in the "ON"
position.
If the moon roof is left open when you turn the ignition key to
the "ACC" or "LOCK" position and open the driver's door, a
buzzer will remind you to close the moon roof.
Key off operation: Even if the ignition key is turned to the
"ACC" or "LOCK" position, the moon roof can be operated until
either front door is opened (or for 43 seconds).
EXTERIOR EQUIPMENT
Jam protection function
D If something gets caught between the moon roof and frame
during slide closing operation, the moon roof stops and
opens half way.
D If something gets caught between the moon roof and frame
during tilting down operation, the moon roof stops and
opens fully.
If the moon roof receives a strong impact, this function may
work even if nothing is caught.
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