Key Programming 1998-2000 Ls400

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Thought I'd attach these docs, as they worked for my 2000 LS400.

Note that each key needs to be programmed twice. Once for the remote (to lock and unlock car), and once for the chip that allows the engine to start with that key.

These should work for 1998-2000 LS400

Hope it helps!

1998-2000 LS400 Engine Key Programming (WORKS).pdf

1998-2000 LS400 Remote Key Programming (WORKS).pdf

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Thx I had these instructions a couple of years ago but would have to search to find it.

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1998 LS400

I currently have a master key programmed (Daily use)
i recently purchased a spare 3 button key from ebay.

My question is the following:
I am able to successfully get through section F under B1. However when i get to section G it cycles twice to indicate that the registration was unsuccessful. Any ideas on what could be causing this?

BTW i have already had the key cut and it does open/close doors manually. Also it has already been programmed to start the car. I just cant get the remote buttons to lock/unlock the doors.

any help would be greatly appreciated. I realize that key programming has been discussed in prior threads but i did not see any responses to my exact situation. Thanks

BTW i am using the following to setup the remote:


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Thanks so much for the info.

I just joined today looking for a way to program a spare remote key for my LS400.

Although I haven't tried it yet, the information found here seems much better that what i found on an open google search.


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