Lexus 2003 LS Owner's Manual page 26

KEYS AND DOORS
For your Lexus dealer to make you a new key with built–in
transponder chip, your dealer will need your key number and
master key or the flat key. However, there is a limit to the
number of additional keys your Lexus dealer can make for you.
If you make your own duplicate key, you will not be able
to cancel the system or start the engine.
For vehicles sold in U.S.A.
FCC ID: NI4RI–16BTY
MADE IN JAPAN
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.
CAUTION
Changes or modifications not expressly approved by
the party responsible for compliance could void the
user's authority to operate the equipment.
12
For vehicles sold in Canada
This device complies with RSS–210 of Industry
Canada.
Operation is subject to the following two conditions:
(1) This device may not cause interference, and (2)
this device must accept any interference, including
interference that may cause undesired operation of the
device.