will 555x work on lexus 2000 ls400?

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132993
Printed Date: May 05, 2025 at 1:28 AM

Topic: will 555x work on lexus 2000 ls400?

Posted By: lorenzanaj
Subject: will 555x work on lexus 2000 ls400?
Date Posted: December 16, 2012 at 8:46 PM

Googling around I see 556u is the recommended immobilizer. I bought a 555x on eBay and they seller listed the 555x as being compatible, but I am not seeing and wires listed in the forum's wiring diagram https://www.the12volt.com/installbay/alarmdetail/1287.html.

Seller suggests these wires:

Color :RED / white (data), RED / black (clock), red (synchro)
Polarity: data

The immobilizer ignition wire is white and the ground reference wire is WHITE/ black.

Any suggestions? Thnks in advance.

Replies:

Posted By: offroadzj
Date Posted: December 16, 2012 at 9:03 PM

Do yourself a favor and use an ADS TBSL TI from idatalink. They are much more reliable and won't require a key in the box like the 556u. The TBSL-TI comes pre-flashed with the correct firmware (TB-TL).

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Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205

Posted By: kreg357
Date Posted: December 16, 2012 at 9:21 PM

If this is for a DEI 555X, not a 556UW, here is the info you seek.

Here is a link to the 555XW info from Xpresskit. It does list the 2000 Lexus LS400 :
https://www.xpresskit.com/product.aspx?productid=39

Below is a wire color list from iDatalink for their bypass module. Unfortunately they use different names for the wires.

LS 400 98-00         555X name
AMP      pin 1 White (DATA) Ignition switch
Code    pin 2 RED / White (DATA)     Ignition switch       = Data
RXCK pin 3 RED / Black (DATA)       Ignition switch       = Clock
TXCT    pin 4 Red (DATA)                  Ignition switch       = Synch
Ground pin 5 WHITE/ Black (-) Ignition switch       = Ground
Key Sense      pin ~   Yellow (-)          Ignition switch      = Keysense

Ignition (+) White @ Ignition harness

Think that should be enough info to get it working.

Here it is laid out like the 555X chart on page 2 of the guide :

Vehicle SYNCH CLOCK DATA IGNITION GROUND KEY SENSE
00 LS400 Red RED / Black RED / White White WHITE/ Black Yellow

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Soldering is fun!