GMC 1995 Safari Owner's Manual page 64

Battery Replacement
Under normal use, the batteries in your key chain transmitter should last
about two years.
You can tell the batteries are weak if the transmitter won't work at the
normal range in any location. If you have to get close to your vehicle before
the transmitter works, it's probably time to change the batteries.
Your transmitter housing snaps apart for ease in battery replacement. To
open the housing:
1.
2.
3.
4.
Insert a dime between two halves of the transmitter housing near the
key ring hole.
Remove the bottom by twisting the dime.
Remove and replace the batteries with two Duracell @-type batteries
(DL2016 or equivalent), positive side down.
Align and snap together the back and top transmitter housings.
Theft
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 walk away from your vehicle with the keys inside, it's an easy target
for joy riders or professional thieves
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so don't do it.
When you park your Vehicle and open the driver's door, you'll hear a chime
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.
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