Carprog Lexus Immobilizer Key Programming Guide

Carprog Lexus Immobilizer Key Programming Guide

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This article show Lexus immobilizer key programming by carprog.

Support Lexus Models & Years

Lexus Models	Year	Transponder Key Type
ES330	1998-2001

2002-2004



TEX




TEX



ES330


2004-


TEX/CR




GS300


1998-


TEX




GS300


1998-2000


TEX




GS400


2001-


TEX




GX470


2004-


TEX/CR




IS200


2000-2004


TEX




IS300


2000-2004


TEX




LS200


1997-1999




1999-



TEX




TEX



LS400


1997-1999


TEX




LX450


1997-1999




1999-



TEX




TEX



LX470


1999-




1999-2004

2004-



TEX




TEX

TEX



RX300


1999-


TEX/CR




RX330


1999-


TEX




SC300


1997-1999




1999-



TEX




TEX



SC400


1997-1999


TEX




SC430


2004-


TEX/CR







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Older Lexus immobiliser system with separated immo box and Texas transponder (4D by Silca). Immobiliser box are located near to ignition key. Usually this is black or brown box marked “immobilizer” or “134.2 kHz”.



Remove immobiliser ECU from the car and open it. Find 93C66 EEPROM in DIP package. Use A5 or A4 adapter and follow CarProg instruction to program transponder key. Short quartz resonator for in-circuit EEPROM programming or remove 93C66 from immobiliser board.

Lexus immobiliser system with transponder antenna and AMP unit on the ignition key and motor ECU. Used in 1999 – 2003 Lexus cars.



Transponder information is stored in motor ECU. Remove motor ECU from the car, open it and find 93C56 EEPROM marked IC900. Use A6 or A4 adapter and follow CarProg instruction to program transponder key. Short quartz resonator for in-circuit EEPROM programming or remove 93C56 from ECU board.

New Lexus cars with Texas Crypto transponder (4D by Silca). Transponder key is stored in separated immobiliser unit marked “ECU IMMOBILIZER”. Remove immobiliser ECU from the car, open it and find 93LC66 SMD EEPROM.



Use only original factory key. With Silca 4D transponder car will not start.

Use A6 or A4 adapter and follow CarProg instruction to program transponder key.

Short quartz resonator for in-circuit EEPROM programming or remove 93C66 from immobilizer board.

This article tech Supported by China OBD2,