The programming procedure for the Transponder Chip for years 98-01 are as follows:
Add Duplicate Key: On-Board Program E (1998+ Toyota, Lexus)
(IGNITION)
1. Simultaneously depress and release brake and accelerator pedals 1 time.
2. Insert existing master key into ignition.
3. Within 15 seconds depress and release accelerator pedal 5 times.
4. Within 20 seconds depress and release the brake pedal 6 times and remove key.
5. Within 10 seconds insert new key into ignition.
6. Within 10 seconds depress and release the accelerator pedal 1 time.
7. After 80 seconds new key is registered and security light goes off.
8. Remove new key and depress and release brake pedal 1 time.
These are the programming procedures for Lexus RX300 (DOORS)
A. 1. Open drivers door
2. Insert your key in the ignition, then remove it.
3. Using the inside power lock button, cycle the locks locked/unlocked 5 times,
leaving them in the unlocked position.
4. Close and open the driver's door.
5. Again, cycle the locks locked/unlocked 5 times, leaving them in the unlocked position.
6. Insert the key in the ignition and turn it one time to ON position, then OFF.
7. Remove the key from the ignition.
8. The power locks should cycle once to indicate you are in the program mode.
9. Press the lock and unlock buttons together. Then, press any keyremote transmitter button for a minimum of 1 second.
The locks should cycle only once. If they cycle twice, you are still in program mode,
Close and open the door. you need to try and press the button again.
I have discovered all problems are associated with how long you hold both buttons down initially,
and how quickly you press either the lock or unlock button. Experiment with slightly
different amounts of time...