1997 Lexus ES 300 User Guide 2 - Page 4

KEYS AND DOORS At this time, 2 beeps sound. Together with the activation of unlocking, the parking, tail, side marker and license plate lights flash 2 times. If the key is in the ignition switch, unlocking cannot be done. You have 30 seconds to open a door after using the wireless remote unlock feature. If a door is not opened by then, all the doors will be automatically locked again. If the "LOCK" or "UNLOCK" switch is kept pressed in, the locking or unlocking operation is not repeated. Release the button and then push again. When you keep the button pushed for about 1 second, you can unlock the trunk lid. One beep sounds. If the key is in the ignition switch, the trunk lid cannot be unlocked with the transmitter. Unlocking the trunk lid "
Off  Louder When you push the remote control switch, the vehicle sounds one beep when the doors are locked by the remote control, and two beeps when the doors are unlocked. You can adjust the beep loudness with the knob under the instrument panel. Turning the knob clockwise increases the volume and turning it counterclockwise until it stops turns the buzzer off. 10