Toyota 4Runner: Problem Symptoms Table

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
The troubleshooting procedures for the theft deterrent system are based on the premise that the door lock control system, wireless door lock control system, lighting system, horn system, engine immobiliser system and smart key system (w/ Smart Key System) are operating normally. Check these systems first before troubleshooting the theft deterrent system.

Theft Deterrent System

Symptom	Suspected Area	See page
Theft deterrent system cannot be set	Smart key system (for Entry Function)*1
	Key reminder warning system*2
	Door courtesy switch circuit
	Back door courtesy switch circuit
	Engine hood courtesy switch circuit
	Replace main body ECU
Security indicator is not blinking when theft deterrent system is set	Security indicator light circuit
	Replace main body ECU
Theft deterrent system can be set even when any door is open	Door courtesy switch circuit
	Back door courtesy switch circuit
	Engine hood courtesy switch circuit
	Replace main body ECU
Vehicle horn(s) do not sound while theft deterrent system is in alarm sounding state	Horn circuit
	Replace main body ECU
Security horn does not sound while theft deterrent system is in alarm sounding state	Security horn circuit
	Replace main body ECU
Hazard warning lights do not flash while theft deterrent system is in alarm sounding state	Lighting system
	Replace main body ECU
Headlights do not flash while theft deterrent system is in alarm sounding state	Headlight relay circuit
	Replace main body ECU
Taillights do not flash while theft deterrent system is in alarm sounding state	Taillight relay circuit
	Replace main body ECU
Interior light does not illuminate while theft deterrent system is in alarm sounding state	Illumination circuit
	Replace main body ECU

*1: w/ Smart Key System
*2: w/o Smart Key System

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the theft deterrent system. *: Use the Techstream. The troubleshooting procedures for the theft deterrent system ...

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove the main body ECU (multiplex network body ECU) (See page ). (b) Measure ...

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