Lexus GS300 1998 Owner's Manual page 25

KEYS AND DOORS
11L021-2
When using a key containing a transponder chip, observe
the following precautions:
D When starting the engine, do not use the key with a key
ring resting on the key grip and do not press the key
ring against the key grip. Otherwise the engine may
not start, or may stop soon after it starts.
11L022-2
12