Trouble Shooting

WARNING: This page is about a different car, the 2000 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform immobilizer system self-diagnostics before performing trouble shooting. See DIAGNOSTIC PROCEDURE under SELF-DIAGNOSTIC SYSTEM.

TROUBLE SHOOTING SYMPTOMS

Problem

Inspect

Immobilizer Not Set (Engine Starts W/Incorrect Key Codes)

⁽¹⁾ ECM

Engine Does Not Start

⁽²⁾ Key; ⁽¹⁾ Wiring Harness; ⁽³⁾ Transponder Key Coil; Amplifier; ⁽¹⁾ ECM

Security Indicator Is Always On

⁽⁴⁾ Security Indicator; ⁽¹⁾ Wiring Harness; ⁽¹⁾ ECM

Security Indicator Always On (Although Code Has Been Registered In Automatic Registration Mode)

⁽¹⁾ Wiring Harness;⁽³⁾ Transponder Key Coil; Amplifier; ⁽¹⁾ ECM

Security Indicator Is Off (When Immobilizer DTC Is Output)

⁽¹⁾ Wiring Harness; ⁽³⁾ Transponder Key Coil; Amplifier; ⁽¹⁾ ECM;

Security Indicator Is Off (When Immobilizer DTC Is Not Output)

⁽¹⁾ Wiring Harness; ⁽¹⁾ ECM

Security Indicator Is Flashing Abnormally

⁽¹⁾ Wiring Harness; ⁽¹⁾ ECM

⁽¹⁾	Check for open or short circuits in wiring. See WIRING DIAGRAMS . Perform ECM PIN VOLTAGE TESTS under COMPONENT TESTS. Repair or replace components as necessary.

⁽²⁾	Ensure key used to start engine is registered. Also check if vehicle will start with other registered keys.

⁽³⁾	Check transponder key coil. See TRANSPONDER KEY COIL under COMPONENT TESTS.

⁽⁴⁾	Complete automatic registration mode. See NEW TRANSPONDER KEY CODE under PROGRAMMING.