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Programming Master Key & Fob For 1998 Es300

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I recently ordered a Master Key and FOB from Sewell Lexus for my 1998 ES300. I am looking for help to program my key and the fob. Any pointers? BTW, I already have one Master key + fob and the new one is a back-up set.

Thanks in advance!

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This was posted by "BARTCAT" way back in 2003.

This is a long process, but here's what you will need

1. Your new key

2. A MASTER KEY (one with the remote in it) already programmed to car.

To program the transponder- (thats the immobilizer part):


sitting in dr. seat, put the master key in ignition, and turn to on.engine OFF. press the gas pedal 5 times to floor and release. now press brake 6 times (press and release)

remove master key from ignition. install new key and turn to on...engine off. press gas to floor once. now wait. the security light will blink for about 45-60 seconds, then it will go off if you did it correctly. once the light is off, car should start.

To program the remote part:


In drivers seat WITH DOOR OPEN. start with door unlocked. first put master key in ignition, turn to on, then back off and remove. using the lock/unlock button on drivers door. press lock.. then unlock 5 times.(lock,unlock,lock,unlock,lock,unlock,lock,un lock,lock,unlock)

Close drivers door, open drivers door.

Performe lock/unlock procedure again 5 times each.

insert key in to ignition and turn to on, then back off and remove.(at this point the doors should lock and unlock by themselves ONCE)

Now press both lock and unlock buttons on REMOTE. release after about 1.5seconds. now press just the lock button on remote.

now open and close the drivers door a couple times to close programming. if you did it right, remote will now work.

thats it..not too hard once youve done it a few times.

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I got the above procedure for programming the immobilizer and keyless entry for 98 ES300 after search for a while from this forum.

Do I need to program my immobilizer part before I try programming the keyless entry?

Also, during the keyless entry programming process, the KEY, that need to be entered and removed and another time entered and turned to position ON; is it the old Master key I posses or the new Master key that I am trying to program.

Please help me. I have to program this another key before the end of this long weekend. :(

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Folks, Please help me!! I am desperate to try DYI for programming my Master Transponder key + FOB. To whole idea is to save $90 from my dealer, who charges 1 hr labor for programming :(

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