rcrx9

Hi everybody,

After all this time I finally picked up a 98 LS400, with 94k miles in great shape from the original owner.

The original owner lost the master key and all I have is the Valet key and the flat credit card type key.

I read through several old posts that stated everything from being able to program a new cut master key using the valet key to needing the ecu reflashed.

I need some help on this. I need to get a new cut master remote key to work on my LS400. Has anybody gone through this scenario recently that would be able to steer me in the right direction?

Local dealerships are quoting me anywhere from $300-$600 to get a new cut master remote key and reflashing the ecu.

Any light you could shed on this would be greatly appreciated.

stock545i

Try this.... if not then may be worthwhile checking with a local professional locksmith as well.. else you are at the mercy of the dealer.. Good luck..

LEXUS LS400 1998-00

Programming When Key added or replaced
System malfunction.

How –Black Key
Obtain 1 programmed black key.
Insert programmed black key into ignition switch.
Within 15 seconds:
o Press and release accelerator pedal 5 times.
Within 20 seconds:
o Press and release brake pedal 6 times.
o Remove black key.
Within 10 seconds:
o Insert black key to be programmed into ignition switch.
Within 10 seconds
o Press and release accelerator pedal once.
o Immobilizer warning lamp will flash.
o After 1 minute immobilizer warning lamp will extinguish.
If programming another key:
o Within 10 seconds: insert black key to be programmed into ignition switch.
o Within 10 seconds: press and release accelerator pedal once.
o Immobilizer warning lamp will flash.
o After 1 minute immobilizer warning lamp will extinguish.

NOTE: to exit programming mode: Remove ignition key and press and release brake pedal at least once within 10 seconds, or wait 10 seconds.
NOTE: a maximum of 7 black keys can be programmed.

How– Gray key
Obtain 1 programmed gray key.
Insert programmed gray key into ignition switch.
Within 15 seconds:
o Press and release accelerator pedal 5 times.
Within 20 seconds:
o Press and release brake pedal 6 times.
o Remove gray key.
Within 10 seconds:
o Insert gray key to be programmed into ignition switch.
Within 10 seconds
o Press and release accelerator pedal once.
o Immobilizer warning lamp will flash.
o After 1 minute immobilizer warning lamp will extinguish.
If programming another key:
o Within 10 seconds: insert gray to be programmed into ignition switch.
o Within 10 seconds: press and release accelerator pedal once.
o Immobilizer warning lamp will flash.
o After 1 minute immobilizer warning lamp will extinguish.

NOTE: to exit programming mode: Remove ignition key and press and release brake pedal at least once within 10 seconds, or wait 10 seconds.
NOTE: a maximum of 3 gray keys can be programmed.

rcrx9

Thanks stock545i.

I'm probably going to buy a new master remote cut key from Sewell Lexus and try to work with a local locksmith first. If this doesn't work, then I'll try a local Lexus dealer.

Anybody in the Chicago area have any good luck with a local Lexus dealer with buying and programming their keys?

Shiryo

This is good info, however not sure how long it would stay up since this may be able to aid thieves... If given a long enough time frame in such scenario... I dunno. Saved to notepad though.

I want nice new keys for my LS.

EDIT: Damn, I have a 97.

PureDrifter

iTrader: (10)

useless to thieves since you need a current master key in order to register another one.

to register one without it you need several grand worth of lexus scan tool.

rcrx9

Well guys, I purchased a cut master remote key from Sewell, had Woodfield Lexus do the ECU swap and purchased another key. Woodfield also programmed both keys. Back in business again.