Toyota 4Runner: 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.

Illuminated Entry System

Symptom	Suspected Area	See page
Illuminated entry system does not operate	DOME fuse	-
	Smart key system (for entry function)*1
	Wireless door lock control system (w/o smart key system)*2
	Door courtesy switch circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	-

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

Interior Light System

Symptom	Suspected Area	See page
Map light does not illuminate	Map light bulb	-
	Map light assembly
	Harness or connector	-
No. 1 room light does not illuminate	No. 1 room light bulb	-
	No. 1 room light assembly	-
	Harness or connector	-
Interior foot light does not illuminate	Active Test (Fr Foot Light)
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	-
Door inside handle illumination light does not illuminate	Inside handle illumination light circuit
Door inside handle illumination light does not illuminate	Main body ECU (multiplex network body ECU)	-
Door courtesy light does not illuminate	Door courtesy light bulb	-
	Door courtesy switch circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	-
Spot light does not illuminate	Luggage room light circuit
	Back door courtesy switch circuit
	Spot light assembly	-
	Multiplex network door ECU	-

Ignition Key Cylinder Light System (w/o Smart Key System)

Symptom	Suspected Area	See page
Ignition key cylinder light does not illuminate	Transponder key amplifier
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	-

Door Mirror Foot Light System

Symptom	Suspected Area	See page
Door mirror foot light does not illuminate	MIRROR fuse	-
	Door mirror foot light circuit
	Outer mirror	-
	Main body ECU (multiplex network body ECU)	-

Vanity Light System

Symptom	Suspected Area	See page
Vanity light does not illuminate	Vanity light bulb	-
	Visor assembly	-
	Harness or connector	-

Glove Box Light System

Symptom	Suspected Area	See page
Glove box light does not illuminate	Harness or connector	-

Battery Saving Control System

Symptom	Suspected Area	See page
Battery saving function does not operate	Door courtesy switch circuit
	IG signal circuit
	Interior light auto cut circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)	-

Problem Symptoms Table

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