Problem Symptoms

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Problem Symptoms

Symptom/Suspect Area

Refer To

Immobilizer Is Not Set (Engine Starts With Key Codes Other Than The Registered Key Code)

ECM

⁽¹⁾

Engine Does Not Start

Key

⁽²⁾

Wire Harness

⁽³⁾

Transponder Key Coil

⁽⁴⁾

Amplifier

.....

ECM

⁽¹⁾

Security Indicator Is Always On

Security Indicator

⁽⁵⁾

Wire Harness

⁽³⁾

ECM

⁽³⁾

Security Indicator Is Always On (Although Code Has Been Registered In The Automatic Registration Mode, Indicator Is Not Off)

Wire Harness

⁽³⁾

Transponder Key Coil

⁽⁴⁾

Amplifier

.....

ECM

⁽¹⁾

Security Indicator Is Off (When DTC Of Immobilizer Is Output)

Wire harness

⁽³⁾

Transponder Key Coil

⁽⁴⁾

Amplifier

.....

ECM

⁽⁴⁾

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

Wire harness

⁽³⁾

ECM

⁽¹⁾

Security Indicator Is Abnormally Blinking

Wire Harness

⁽³⁾

ECM

⁽¹⁾

⁽¹⁾	SELF-DIAGNOSTICS

⁽²⁾	Check that the key which did not start the engine has been registered and that it is possible to start with other already registered keys.

⁽³⁾	HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS

⁽⁴⁾	DTC B2798/99 COMMUNICATION MALFUNCTION NO. 2

⁽⁵⁾	Finish the automatic registration mode because the mode might still remain.