1998 Chevrolet Astro Owner's Manual - Page 91

The power door lock switch will lock or unlock the rear hatch and Dutch doors. See "Hatch 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 press 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 inside door handle will not work the latch. This will help stop a door frombeing accidentally opened. 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. Your keyless entry system operates on a radio frequency subject to Federal Communications Commission (FCC) Rules and with Industry Canada. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Keyless Entry System (Option) If your vehicle has this option, you can lock and unlock your doors orunlock your rear hatch from about 3 feet (1 m) up to 30 feet (9 m) away using the remote keyless entry transmitter supplied with your vehicle. 2-7