1999 Honda Civic Owner's Manual - Page 72

Keys and Locks Power Door Locks Both doors lock when you push the lock tab on the driver's door in, or lock the driver's door from the outside with the key. Only the driver's door unlocks when you use the key or lock tab. To unlock the passenger's door, use the master door lock switch or the lock tab on the passenger's door. MASTER DOOR LOCK SWITCH The doors can also be locked and unlocked from the outside with the key. On HX, EX and Si models in the U.S., and Si and SiR models in Canada The master door lock switch allows control of both door locks from the driver's door. Push the switch down to lock both doors, and up to unlock them. Instruments and Controls