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1998 Lexus SC400 Key Programming

Add Duplicate Key

1. Insert an existing master key into the ignition cylinder.
Do not turn the key from the OFF (LOCK) position.
2. Within fifteen seconds of inserting the key, depress and release the accelerator pedal 4 times.
3. Within 20 seconds of completing the above step, depress and release the brake pedal 5 times and then remove the original key
from the ignition.
4. Within 10 second, insert the new key into the ignition. Do not turn the key from the OFF (LOCK) position.
5. Within 10 seconds depress and release the accelerator pedal 1 time.
6. After 80 seconds the new key has been learned by the vehicle’s on-board computer and the Security light will go off.
Remove the new key and depress and release the brake pedal 1 time.

To delete all but one key from the unit:

1. Insert an existing master key into the ignition cylinder. Do not turn the key from the OFF (LOCK) position.
2. Within fifteen seconds of inserting the key, depress and release the accelerator pedal six times.
3. Within twenty seconds of completing the above step, depress and release the brake pedal seven times.
4. The security light will flash, indicating all keys other than the one being used have been deleted.
5. Remove the key from the ignition cylinder within ten seconds. It will be the only key still programmed to work.