Lexus RX300 2003 Owner's Manual page 40

CAUTION
Before driving, make sure the doors are closed and
locked, especially when small children are in the
vehicle. Along with the proper use of seat belts, locking
the doors helps prevent the driver and passengers from
being thrown out from the vehicle during an accident.
It also helps prevent the doors from being opened
unintentionally.
Locking with power door lock switch
11R102
"
Lock Unlock
1 2
To lock all the doors simultaneously, push the power door
lock switch down on the front side. Pushing down on the
rear side will unlock them.
The same switch is also located on the front passenger's side.
Locking with rear door child–protector
11R101
"
Lock Unlock
1 2
Whenever small children are in the vehicle, lock the rear
door so that it does not open from the inside. To do this,
turn the knob to the "LOCK" position as shown and then
close the door.
2003 RX300 from Aug. 02' Prod. (OM48442U)