Lexus SC 430 2001 Owner's Manual page 108

2-1. Driving procedures
If the engine does not start
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Check whether the other keys will start the engine.
If they work, your key may be broken. Have the key checked at your Lexus dealer.
Leak detection pump
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Approximately five hours after the engine is turned off, you may hear sound coming
from underneath the trunk for several minutes. This is normal operation and does
not indicate a malfunction.
Starting the engine using the flat key
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Put the key case away when the indicator light goes out. This means the
engine immobilizer system has turned off.
Start the engine within 20 seconds after the indicator light goes off.
108
Remove the flat key from its case. Insert the
removed flat key into the engine switch.
Bring the key case close to the engine switch
within 10 seconds as indicated by an arrow.