Directed Electronics 555X Manual

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Models

Lexus GS300: 2002

Product Description

The Lexus Immobilizer anti-theft system uses a low-power

transponder mounted in the head of the ignition key. When the

vehicle is started, the Key Cylinder Module converts the transpon-

der signal and sends a secure, coded signal to the Engine Control

Module. If the signal to the Engine Control Module is correct, the

vehicle will start.

The 555X uses a unique autoprogram sequence to learn the secure

code from the Key Cylinder Module and repeats it when remote start

is activated, eliminating the need to leave a key in the vehicle.

The 555X Lexus Immobilizer Bypass Module integrates into the

wiring for the Lexus immobilizer anti-theft system to allow remote

start capability, while still allowing normal function of the factory

immobilizer anti-theft system.

WARNING! It is recommended that the 555X Immobilizer

Bypass Module only be installed by an authorized Directed

dealer. Attempting installation without the proper tools and

training can result in damage to the vehicle electronics.

Pre-Installation Test

IMPORTANT! Wire connections from the 555X to the Lexus

immobilizer wires should be done AFTER all remote start

connections are completed and the following test is suc-

cessful.

After completing all remote start wiring connections, insert the

vehicle key into the ignition switch. Do NOT turn the ignition on.

Activate the remote start.

If the vehicle remote starts, proceed with the 555X installation. If

the vehicle fails to start, check all ignition and tachometer con-

nections and retest. Do NOT proceed with 555X installation until

this test is successful.

555X Lexus Immobilizer

Bypass Module

A successful test verifies that all ignition and tachometer con-

nections are correct. This will eliminate the remote start as the

cause of a failure to start after completing the 555X installation.

Installation Instructions

Remove steering column shroud to gain access to the wire

harnesses at the rear of the ignition switch.

Locate the appropriate wires exiting the ignition switch and

immobilizer receiver. The wire colors are listed in the

Application Guide.

Wire the 555X as shown in the wiring diagram.

Wire Connection Guide

GREEN: Connect this wire to the (-) key sense wire at the

ignition cylinder. The key sense wire rests at ground when the

key is inserted into the ignition switch.

BLACK: Connect this wire to a quality chassis ground (prefer-

ably scraped sheet metal) separate from other component

ground locations.

BLUE: Connect this wire to the BLUE status output of the

remote start. It must see ground during remote start.

RED: Connect this wire to a constant (+)12 volt source.

YELLOW: Locate the Data wire listed in the Application Guide

and cut it. Connect this wire to the end of the Data wire that

is coming from the ignition switch.

YELLOW/BLACK: Connect this wire to the end of the Data wire

that goes toward the ECM side.

IMPORTANT! Signals on the immobilizer wires are Data,

not voltage. They can't be tested with conventional test

equipment. All connections should be made using solder

and tape to avoid any signal loss due to resistance in the

connections. Quick connects are unacceptable!

VIOLET: Connect this wire to the keyside of the clock wire.

VIOLET/BLACK: Connect this wire to the clock wire's ECM side.

BROWN: Connect this wire to the Synch wire listed in the

Application Guide.

N555X 10/02