![]() This chip can be removed from the remote. This is the part that is programmed to the car to allow the engine to start when near the ignition cylinder. If you take the remote apart, you'll notice the gray/black "chip". Note this is for my Rx400h, but the remote for your car is very similar. small "chip" that allows the engine to start. remote (piece with the buttons) that can unlock/lock/panic the carģ. So you have a valet key that has the correct blade and starts the car? And you have a master remote that can lock/unlock the car? Then you're good!Ģ. Wow, I thought this would be a simple fix, but I guess not. Even if I get a key cut that matches the cut on the valet key and switch out the remote portion of the key, I don't think I can sync it with the ignition to actually start the car. My "master" key has a remote that unlocks/locks the door, but the key isn't recognized when it's put in the ignition. Now I am doubting if I can get a new key to work with the shell and uncut key I bought on EBay. The valet key has a transponder, I guess it's hidden in the gray plastic. You don't want to be in disaster mode if you ever lose your keys. I've got three full sets for my LS - one for my wife, one for me and one backup set in a secure place. Whatever you do, you should have more than one fully working master key and you might as well have at least one extra valet key - particularly since they are inexpensive. If the new valet key didn't have a transponder, I don't think programming it would not have been necessary or even possible. When I bought an extra master key and an extra valet key for my 2000 LS400 back in 2003, the service writer programmed both keys to work in the ignition. The valet is just a gray key with no transponder. Would this work? I saw some places you need a master key to program, but it seems like I don't have to program anything. I was hoping I could get the uncut key with empty shell, have it cut as the same as the valet key, and transfer the transponder from the old master key to the new key. ![]() The master key (black) has a transponder which works, but the key itself is cut different and does not work in the ignition. The dealer can do it from your VIN for 2002-on cars, so you are in luck with your 2004, others with a 2001 are screwed and need an ECU. You cannot program a new to the car transponder without a master key. If you have the original already programed in transponders in your keys then yes get a blank, get it cut and swap transponder / remote unit and you are good to go. (are the transponders in your keys already?) Go back to your friend and ask for the original master key(s). To do this yourself you need a Master key that fits the ignition.
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