Buick 1993 LeSabre Owner's Manual page 85

You may also have a lock out button. Push LOCK to
disable the power window switches. This will prevent
passengers from opening and closing the windows. Push
UNLOCK to allow your passengers to be able to use
their window switches again.
Horn
To sound the horn, press a pad with the horn symbol on
either side of the steering wheel.
Remote Trunk Release
I !
The trunk release switch in
the glove box must be
"ON" for the "TRUNK"
button to work.
This feature allows you to secure items in the trunk
when you must leave the ignition key with an attendant.
To secure the trunk, turn OFF the TRUNK RELEASE,
lock the glove box, then take the door key with you.
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