LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

Note

When replacing the body ECU, be sure to initialize the automatic light control system.*

*: w/ Automatic Light Control System

Click here
As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.*

*: w/ Power Door Lock

Click here
When replacing the combination meter assembly, make sure to replace it with a new one.

Tech Tips

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.

Headlight (w/ Automatic Light Control System, for Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right low beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
Low beam headlight on right side does not illuminate.	H-LP RH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Low beam headlight on left side does not illuminate.	H-LP LH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
High beam headlight on right side does not illuminate.	H-LP RH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam headlight on left side does not illuminate.	H-LP LH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam flash function does not operate (high beam headlights are normal).	Headlight dimmer switch assembly	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
Both left and right low beam and high beam headlights do not illuminate.	H-LP MAIN fuse	-
	Headlight relay (H-LP)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Harness or connector	-

Headlight (w/o Automatic Light Control System, for Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right low beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Combinetion meter assembly	Click here
	Harness or connector	-
Low beam headlight on right side does not illuminate.	H-LP RH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Low beam headlight on left side does not illuminate.	H-LP LH-LO fuse	-
	Headlight bulb	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Combinetion meter assembly	Click here
	Harness or connector	-
High beam headlight on right side does not illuminate.	H-LP RH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam headlight on left side does not illuminate.	H-LP LH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam flash function does not operate (high beam headlights are normal).	Headlight dimmer switch assembly	Click here
	Combinetion meter assembly	Click here
	Harness or connector	-
Both left and right low beam and high beam headlights do not illuminate.	H-LP MAIN fuse	-
	Headlight relay (H-LP)	Click here
	Combinetion meter assembly	Click here
	Harness or connector	-

Headlight (for LED Headlight)
Symptom	Suspected Area	Link
Both left and right low beam headlights do not illuminate. Click here Click here	Headlight relay (H-LP)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
Low beam headlight on right side does not illuminate.	H-LP RH-LO fuse	-
	Headlight assembly RH	Click here
	Harness or connector	-
Low beam headlight on left side does not illuminate.	H-LP LH-LO fuse	-
	Headlight assembly LH	Click here
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Headlight dimmer relay (DIMMER)	Click here
	Headlight dimmer switch assembly	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
High beam headlight on right side does not illuminate.	H-LP RH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam headlight on left side does not illuminate.	H-LP LH-HI fuse	-
	Headlight bulb	Click here
	Harness or connector	-
High beam flash function does not operate (high beam headlights are normal).	Headlight dimmer switch assembly	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
Both left and right low beam and high beam headlights do not illuminate.	H-LP MAIN fuse	-
	Harness or connector	-

Clearance Light (for Halogen Headlight)
Symptom	Suspected Area	Link
Both left and right clearance lights do not illuminate (taillights are normal).	Harness or connector	-
Clearance light on one side does not illuminate.	Clearance light bulb	Click here
Clearance light on one side does not illuminate.	Harness or connector	-

Clearance Light (for LED Headlight)
Symptom	Suspected Area	Link
Both left and right clearance lights do not illuminate (taillights are normal).	Harness or connector	-
Clearance light on right side does not illuminate.	Headlight assembly RH	Click here
Clearance light on right side does not illuminate.	Harness or connector	-
Clearance light on left side does not illuminate.	Headlight assembly LH	Click here
Clearance light on left side does not illuminate.	Harness or connector	-

Daytime Running Light (w/ Daytime Running Light)
Symptom	Suspected Area	Link
Both left and right daytime running lights do not illuminate.	Running light relay (DRL)	Click here
	FOG FR/DRL fuse	-
	CAN communication system (for LHD with Central Gateway ECU)	Click here
	CAN communication system (for LHD with Central Gateway ECU)	Click here
	CAN communication system (for RHD with Central Gateway ECU)	Click here
	CAN communication system (for RHD without Central Gateway ECU)	Click here
	Combination meter assembly	Click here
	Harness or connector	-
Daytime running light on right side does not illuminate.	Headlight assembly RH (for Halogen Headlight)	Click here
	Headlight assembly RH (for LED Headlight)	Click here
	Harness or connector	-
Daytime running light on left side does not illuminate.	Headlight assembly LH (for Halogen Headlight)	Click here
	Headlight assembly RH (for LED Headlight)	Click here
	Harness or connector	-

Front Fog Light (w/ Automatic Light Control System, Front Fog Light)
Symptom	Suspected Area	Link
Both left and right front fog lights do not illuminate (taillights are normal).	Fog light relay (FOG FR)	Click here
	FOG FR/DRL fuse	-
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-
Front fog light on one side does not illuminate.	Front fog light bulb (for Halogen Fog Light)	Click here
	fog light assembly (for LED Fog Light)	Click here
	Harness or connector	-

Front Fog Light (w/o Automatic Light Control System, w/ Front Fog Light)
Symptom	Suspected Area	Link
Both left and right front fog lights do not illuminate (taillights are normal).	Fog light relay (FOG FR)	Click here
	FOG FR/DRL fuse	-
	Headlight dimmer switch assembly	Click here
	Combinetion meter assembly	Click here
	Harness or connector	-
Front fog light on one side does not illuminate.	Front fog light bulb	Click here
Front fog light on one side does not illuminate.	Harness or connector	-

Rear Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	Link
Rear fog light does not illuminate (taillights are normal).	Rear fog light relay (FOG RR)	Click here
	FOG RR fuse	-
	Rear fog light bulb	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Instrument panel junction block assembly	Click here
	Body ECU	Click here
	Harness or connector	-

License Plate Light
Symptom	Suspected Area	Link
License plate light does not illuminate (taillights are normal).	License plate light bulb	Click here
	Harness or connector	-

Taillight (w/ Automatic Light Control System)
Symptom	Suspected Area	Link
Taillight on right side does not illuminate.	Taillight bulb	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Taillight on left side does not illuminate.	Taillight bulb	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
All of the taillights do not illuminate.	Tail light relay (TAIL)	Click here
	TAIL fuse	-
	Headlight dimmer switch assembly	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-

Taillight (w/o Automatic Light Control System)
Symptom	Suspected Area	Link
Taillight on right side does not illuminate.	Taillight bulb	Click here
	Rear combination light socket and wire sub-assembly RH	Click here
	Harness or connector	-
Taillight on left side does not illuminate.	Taillight bulb	Click here
	Rear combination light socket and wire sub-assembly LH	Click here
	Harness or connector	-
All of the taillights do not illuminate.	Tail light relay (TAIL)	Click here
	TAIL fuse	-
	Headlight dimmer switch assembly	Click here
	Harness or connector	-

Stop Light (w/o VSC)
Symptom	Suspected Area	Link
Stop light on right side does not illuminate.	Stop light bulb	Click here
	Rear combination light socket and wire sub-assembly RH (w/ Deck)	Click here
	Rear combination light assembly RH (for Deck-less)	Click here
	Harness or connector	-
Stop light on left side does not illuminate.	Stop light bulb	Click here
	Rear combination light socket and wire sub-assembly LH (w/ Deck)	Click here
	Rear combination light assembly LH (for Deck-less)	Click here
	Harness or connector	-
Center stop light does not illuminate.	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
All of the stop lights do not illuminate.	STOP fuse	-
	Stop light switch assembly	Click here
	Anti-lock brake system (w/ ABS)	Click here
	Harness or connector	-

Stop Light (w/ VSC)
Symptom	Suspected Area	Link
Stop light on right side does not illuminate.	Stop light bulb	Click here
	Rear combination light socket and wire sub-assembly RH (w/ Deck)	Click here
	Rear combination light assembly RH (for Deck-less)	Click here
	Harness or connector	-
Stop light on left side does not illuminate.	Stop light bulb	Click here
	Rear combination light socket and wire sub-assembly LH (w/ Deck)	Click here
	Rear combination light assembly LH (for Deck-less)	Click here
	Harness or connector	-
Center stop light does not illuminate. (w/ Center Stop Light)	Harness or connector	-
	Center stop light assembly	Click here
All of the stop lights do not operate normally.	STOP fuse	-
	STOP/CDS FAN relay	Click here
	Vehicle stability control system	Click here
	Stop light switch assembly	Click here
	Harness or connector	-

Back-up Light
Symptom	Suspected Area	Link
Back-up light does not illuminate.	IG1 NO.1 fuse	-
	Back-up light bulb	Click here
	Rear combination light socket and wire sub-assembly LH (w/ Deck)	Click here
	Rear combination light socket and wire sub-assembly RH (w/ Deck)	Click here
	Rear combination light sub-assembly LH (for Deck-less)	Click here
	Rear combination light sub-assembly RH (for Deck-less)	Click here
	Park/neutral position switch assembly (for AC60E)	Click here
	Park/neutral position switch assembly (for AC60F)	Click here
	Back-up light switch assembly (for R151)	Click here
	Back-up light switch assembly (for R151F)	Click here
	Back-up light switch assembly (for RC60 / RC61)	Click here
	Back-up light switch assembly (for RC60F / RC61F)	Click here
	Harness or connector	-

Turn Signal Light
Symptom	Suspected Area	Link
No turn signal lights operate (hazard warning lights are normal).	Turn signal switch circuit	Click here
	Combination meter assembly	Click here
One of the turn signal lights does not operate.	Meter/gauge system	Click here

Hazard Warning Light System
Symptom	Suspected Area	Link
Hazard warning lights do not operate (turn signal lights are normal).	Hazard warning switch circuit	Click here
	Combination meter assembly	Click here
Emergency brake signal (hazard warning light blink) does not operate. (w/ VSC)	CAN communication system (for LHD with Central Gateway ECU)	Click here
	CAN communication system (for LHD without Central Gateway ECU)	Click here
	CAN communication system (for RHD with Central Gateway ECU)	Click here
	CAN communication system (for RHD without Central Gateway ECU)	Click here
	Vehicle stability control system	Click here
	Combination meter assembly	Click here

Automatic Light Control System (w/ Automatic Light Control System)
Symptom	Suspected Area	Link
Automatic light control system does not operate.	Headlight dimmer switch assembly	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here

Light Auto Turn-off System (w/ Automatic Light Control System)
Symptom	Suspected Area	Link
Light auto turn-off system does not operate.	Headlight dimmer switch assembly	Click here
	Front door courtesy light switch assembly RH (for Single Cab)	Click here
	Front door courtesy light switch assembly RH (for Smart Cab)	Click here
	Front door courtesy light switch assembly RH (for Double Cab)	Click here
	Instrument panel junction block assembly (for LHD)	Click here
	Instrument panel junction block assembly (for RHD)	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-

Follow Me Home System (w/ Automatic Light Control System)
Symptom	Suspected Area	Link
Follow me home system does not operate.	Headlight dimmer switch assembly	Click here
	Body ECU (for LHD)	Click here
	Body ECU (for RHD)	Click here
	Harness or connector	-