GMC 1995 Safari Owner's Manual page 62

Power Door Locks
If your vehicle has
power door locks,
push the power door
lock switch to lock or
unlock all the doors at
once.
The power door lock switch will not lock or unlock the rear hatch and Dutch
doors. You must use the HATCH REL switch. See "Rear Hatch and Dutch
Doors Release" in this section.
Every vehicle with power door locks has a pulse lock system. A pulse lock
system works like this:
If the sliding door is open and you push the power door lock switch, the
sliding door will not lock immediately. After you close the door, the system
comes on and, in about five seconds, locks the sliding door.
All models have overriding door locks. When a door is locked, the door
handle will not work the latch. This will help stop a door from being
accidentally opened. However, power door locks do not affect the operation
of the hatch.
Leaving Your Vehicle
If you are leaving the vehicle, take your keys, open your door and set the
locks from inside. Then get out and close the door.
Keyless Entry System
If your vehicle has this option, you can lock and unlock your doors or hatch
from up to 30 feet (9 m) away using the key chain transmitter supplied with
your vehicle.
Your Keyless Entry System operates on a radio frequency subject to Federal
Communications Commission (FCC) Rules.
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