GMC 1996 Savana Van Owner's Manual page 70

Theft
Parking at Night
Vehicle theft is big business, especially in some
cities. Although your vehicle has a number of
theft-deterrent features, we know that nothing we
put on it can make it impossible to steal. However,
there are ways you can help.
Key in the Ignition
If you leave your vehicle with the keys inside, it's an
easy target for joy riders or professional thieves -- so
don't do it.
When you park your vehicle and open the driver's
door, you'll hear a tone reminding you to remove your
key from the ignition and take it with you. Always
do
this. Your steering wheel will be locked, and so will
your ignition and transmission. And remember to lock
the doors.
Park in a lighted spot, close all windows and lock your
vehicle. Remember to keep your valuables out of sight.
Put them in a storage area, or take them with you.
Parking Lots
If you park in a lot where someone will be watching
your vehicle, it's best to lock it up and take your keys.
But what if you have to leave your ignition key? What
if you have to leave something valuable in your vehicle?
Put your valuables in a storage area, like your
glove box.
Lock all the doors except the driver's.
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