LIGHTING SYSTEM PROBLEM SYMPTOMS TABLE

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.

Halogen Headlight (w/o Rear Fog Light and w/o Automatic Light Control System)
Symptom	Suspected Area	See page
Low beam headlights and high beam headlights do not illuminate.	H-LP MAIN fuse	Click here
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
Both left and right low beam headlights do not illuminate.	H-LP LH LO fuse and H-LP RH LO fuse	Click here
	H-LP/US-DRL relay	Click here
	No. 1 headlight bulb	-
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
Low beam headlight on one side does not illuminate.	H-LP LH LO fuse or H-LP RH LO fuse	Click here
	No. 1 headlight bulb	-
	Harness or connector	-
Both left and right high beam headlights do not illuminate (low beam headlights are normal).	H-LP LH HI fuse and H-LP RH HI fuse	Click here
	DIM relay	Click here
	No. 1 headlight bulb	-
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
High beam headlight on one side does not illuminate.	H-LP LH HI fuse or H-LP RH HI fuse	Click here
	No. 1 headlight bulb	-
	Harness or connector	-
High beam headlights do not illuminate with "High Flash" function (passing function).	Headlight dimmer switch assembly	Click here
	Harness or connector	-
Clearance lights do not illuminate (taillights are normal).	Clearance light bulb	-
	Clearance light socket	-
	Harness or connector	-

Halogen Headlight (w/ Rear Fog Light or w/ Automatic Light Control System)
Symptom	Suspected Area	See page
Low beam headlights and high beam headlights do not illuminate.	H-LP MAIN fuse	Click here
	Headlight dimmer switch circuit	Click here
	Headlight relay circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector	-
Both left and right low beam headlights do not illuminate.	H-LP LH LO fuse and H-LP RH LO fuse	Click here
	No. 1 headlight bulb	-
	Headlight dimmer switch circuit	Click here
	Headlight relay circuit	Click here
	Harness or connector (low beam headlights - DIM relay, body ground)	-
	Main body ECU (multiplex network body ECU)	-
Low beam headlight on one side does not illuminate.	H-LP LH LO fuse or H-LP RH LO fuse	Click here
	No. 1 headlight bulb	-
	Harness or connector	-
Both left and right high beam headlights do not illuminate (low beam headlights are normal).	H-LP LH HI fuse and H-LP RH HI fuse	Click here
	DIM relay	Click here
	No. 1 headlight bulb	-
	Headlight dimmer switch circuit	Click here
	Headlight relay circuit	Click here
	Harness or connector (high beam headlights - DIM relay, body ground)	-
	Main body ECU (multiplex network body ECU)	-
High beam headlight on one side does not illuminate.	H-LP LH HI fuse or H-LP RH HI fuse	Click here
	No. 1 headlight bulb	-
	Harness or connector	-
High beam headlights do not illuminate with "High Flash" function (passing function).	Headlight dimmer switch circuit	Click here
	Main body ECU (multiplex network body ECU)	-
Clearance lights do not illuminate (taillights are normal).	Clearance light bulb	-
	Clearance light socket	-
	Harness or connector	-

HID Headlight
Symptom	Suspected Area	See page
Low beam headlights and high beam headlights do not illuminate.	H-LP MAIN fuse	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector	-
Both left and right low beam headlights do not illuminate.	H-LP LH LO fuse and H-LP RH LO fuse	Click here
	H-LP/US-DRL relay	Click here
	Discharge headlight bulb	Click here
	Headlight dimmer switch circuit	Click here
	Low beam headlight circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (low beam headlights - H-LP/US-DRL relay, body ground)	-
Low beam headlight on one side does not illuminate.	H-LP LH LO fuse or H-LP RH LO fuse	Click here
	Discharge headlight bulb	Click here
	Harness or connector	-
	Headlight light control ECU sub-assembly	-
Both left and right high beam headlights do not illuminate (low beam headlights are normal).	H-LP LH HI fuse and H-LP RH HI fuse	Click here
	DIM relay	Click here
	No. 1 headlight bulb	-
	Headlight dimmer switch circuit	Click here
	High beam headlight circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (high beam headlights - DIM relay, body ground)	-
High beam headlight on one side does not illuminate.	H-LP LH HI fuse or H-LP RH HI fuse	Click here
	No. 1 headlight bulb	-
	Harness or connector	-
High beam headlights do not illuminate with "High Flash" function (passing function).	Headlight dimmer switch circuit	Click here
	Main body ECU (multiplex network body ECU)	-
Clearance lights do not illuminate (taillights are normal).	Clearance light bulb	-
Clearance lights do not illuminate (taillights are normal).	Harness or connector	-
Discharge headlight bulb flickers.	Discharge headlight bulb	Click here
	Harness or connector	-
	Headlight light control ECU sub-assembly	-
Discharge headlight bulb is dark.	Discharge headlight bulb	Click here
	Harness or connector	-
	Headlight light control ECU sub-assembly	-

Front Fog Light (w/ Rear Fog Light)
Symptom	Suspected Area	See page
Front fog light on one side does not illuminate.	Fog light bulb	-
Front fog light on one side does not illuminate.	Harness or connector	-
Both left and right front fog lights do not illuminate (taillight is normal).	FOG FR fuse	Click here
	FR FOG relay	Click here
	Headlight dimmer switch circuit	Click here
	Front fog light circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (fog lights - FR FOG relay, body ground)	-

Front Fog Light (w/o Rear Fog Light)
Symptom	Suspected Area	See page
Front fog light on one side does not illuminate.	Fog light bulb	-
Front fog light on one side does not illuminate.	Harness or connector	-
Both left and right front fog lights do not illuminate (taillight is normal).*1	FOG FR fuse	Click here
	FR FOG relay	Click here
	Headlight dimmer switch circuit	Click here
	Front fog light circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (fog lights - FR FOG relay, body ground)	-
Both left and right front fog lights do not illuminate (taillight is normal).*2	FOG FR fuse	Click here
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
	Instrument panel junction block assembly	-

*1 : w/ Automatic Light Control System

*2 : w/o Automatic Light Control System

Taillight (w/ LED Type Stop Light and w/o Automatic Light Control System)
Symptom	Suspected Area	See page
Both left and right tail lights do not illuminate (clearance lights and license plate lights included).	TAIL NO. 2 fuse	Click here
	Headlight dimmer switch assembly	Click here
	Harness or connector	-
Tail light on one side does not illuminate.	Rear combination light socket & wire sub-assembly	Click here
	Rear combination light lens & body	-
	Harness or connector	-
License plate lights do not illuminate (taillight is normal).	License plate light bulb	-
	License plate light assembly
	Harness or connector	-

Taillight (w/ LED Type Stop Light and w/ Automatic Light Control System)
Symptom	Suspected Area	See page
Both left and right tail lights do not illuminate (clearance lights and license plate lights included).	TAIL NO. 2 fuse	Click here
	Headlight dimmer switch circuit	Click here
	Taillight relay circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (taillights - instrument panel junction block assembly, body ground)	-
Tail light on one side does not illuminate.	Rear combination light socket & wire sub-assembly	Click here
	Rear combination light lens & body	-
	Harness or connector	-
License plate lights do not illuminate (taillight is normal).	License plate light bulb	-
	License plate light assembly	Click here
	Harness or connector	-

Taillight (w/ Bulb Type Stop Light)
Symptom	Suspected Area	See page
Both left and right tail lights do not illuminate (clearance lights and license plate lights included).	TAIL NO. 2 fuse	Click here
	Headlight dimmer switch circuit	Click here
	Taillight relay circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (taillights - instrument panel junction block assembly, body ground)	-
Tail light on one side does not illuminate.	Tail & stop light bulb	-
	Rear combination light socket & wire sub-assembly	Click here
	Harness or connector	-
License plate lights do not illuminate (taillight is normal).	License plate light bulb	-
	License plate light assembly	Click here
	Harness or connector	-

Stop Light (w/ LED Type Stop Light)
Symptom	Suspected Area	See page
Stop light on one side does not illuminate.	Rear combination light socket & wire sub-assembly	Click here
	Rear combination light lens & body	-
	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
Center stop light does not illuminate.	Harness or connector	-
All lights do not operate.	STOP fuse	Click here
	Stop light switch assembly	Click here
	Stop light circuit	Click here
	Harness or connector (stop lights - No. 1 integration relay, body ground)	-
	No. 1 integration relay	-

Stop Light (w/ Bulb Type Stop Light)
Symptom	Suspected Area	See page
Stop light on one side does not illuminate.	Tail & stop light bulb	-
	Rear combination light socket & wire sub-assembly	Click here
	Harness or connector	-
Center stop light does not illuminate.	Center stop light assembly	Click here
Center stop light does not illuminate.	Harness or connector	-
All lights do not operate.	STOP fuse	Click here
	Stop light switch assembly	Click here
	Harness or connector	-

Rear Fog Light
Symptom	Suspected Area	See page
Rear fog light does not illuminate.	FOG RR fuse	Click here
	Rear fog light bulb	-
	Headlight dimmer switch circuit	Click here
	Rear fog light circuit	Click here
	Main body ECU (multiplex network body ECU)	-
	Harness or connector (rear fog lights - instrument panel junction block assembly, body ground)	-

Back-up Light (for CVT)
Symptom	Suspected Area	See page
Back-up light does not illuminate.	Buck-up light bulb	-
	Buck-up light socket	Click here
	Park/neutral position switch assembly*1	Click here
	Park/neutral position switch assembly*2	Click here
	Harness or connector	-

*1: for 1NR-FE
*2: for 1NZ-FE

Back-up Light (except CVT)
Symptom	Suspected Area	See page
Back-up light does not illuminate.	Buck-up light bulb	-
	Buck-up light socket	Click here
	Buck-up light switch assembly*1	Click here
	Buck-up light switch assembly*2	Click here
	Buck-up light switch assembly*3	Click here
	Harness or connector	-

*1: for 1NR-FE
*2: for 1ND-TV (w/ Manual Transaxle)
*3: for 1ND-TV (w/ Multi-mode Manual Transaxle)

Turn Signal and Hazard Warning Light
Symptom	Suspected Area	See page
Hazard warning lights do not operate (turn signal lights are normal).	HAZ fuse	Click here
	Hazard warning switch circuit	Click here
	Harness or connector	-
Turn signal lights do not operate (hazard warning lights are normal).	Check the DTC (meter / gauge system)	Click here
	Headlight dimmer switch circuit	Click here
Turn signal lights do not operate in one direction.	Check for DTCs (meter / gauge system)	Click here
Turn signal lights do not operate in one direction.	Headlight dimmer switch circuit	Click here
Front turn signal light does not illuminate.	Check for DTCs (meter / gauge system)	Click here
Side turn signal light does not illuminate.	Side turn signal light assembly	Click here
	Outer rear view mirror assembly	-
	Harness or connector	-
Rear turn signal light does not illuminate.	Check for DTCs (meter / gauge system)	Click here

Automatic Light Control System
Symptom	Suspected Area	See page
Automatic light control system does not operate.	Check for DTCs	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (multiplex network body ECU)	-

Light Auto Turn Off System (w/ Rear Fog Light)
Symptom	Suspected Area	See page
Light auto turn off system does not operate.	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Main body ECU (multiplex network body ECU)	-

Light Auto Turn Off System (w/o Rear Fog Light)
Symptom	Suspected Area	See page
Light auto turn off system does not operate.	IG signal circuit	Click here
	Headlight dimmer switch circuit	Click here
	Door courtesy switch circuit (Driver side)	Click here
	Main body ECU (multiplex network body ECU)	-

Battery Saving Control
Symptom	Suspected Area	See page
Battery saving function does not operate	Door courtesy switch circuit	Click here
	IG signal circuit	Click here
	Main body ECU (multiplex network body ECU)	-

Daytime Running Light System
Symptom	Suspected Area	See page
Daytime running light system does not operate.	Headlight dimmer switch circuit	Click here
	IG signal circuit	Click here
	Headlight relay circuit	Click here
	Taillight relay circuit	Click here
	Main body ECU (multiplex network body ECU)	-

Follow Me Home System
Symptom	Suspected Area	See page
Follow me home system does not operate.	Headlight dimmer switch circuit	Click here
	IG signal circuit	Click here
	Main body ECU (multiplex network body ECU)	-

Manual Headlight Beam Level Control System
Symptom	Suspected Area	See page
Manual headlight leveling control system does not operate.	Headlight leveling switch	Click here
	Headlight assembly	-
	Harness or connector	-

Automatic Headlight Beam Level Control System
Symptom	Suspected Area	See page
Headlight beam level control does not operate (warning light is off).	Check the fail-safe function	Click here
	Headlight beam level control actuator circuit	Click here
	Indicator light circuit	Click here
	Headlight signal circuit	Click here
	Headlight leveling ECU power source circuit	Click here
	Headlight assembly	-
	Headlight leveling ECU assembly	-
	Combination meter assembly	-
Headlight beam level control system warning light does not come on when turning the ignition switch ON.	Indicator light circuit	Click here
	Headlight leveling ECU power source circuit	Click here
	Headlight leveling ECU assembly	-
	Combination meter assembly	-
Initialization cannot be performed.	Check for DTCs	Click here
	LVL terminal circuit	Click here
	Headlight leveling ECU assembly	-

Note

Initialize the headlight leveling ECU assembly after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly RH.
Initialization is also necessary when the headlight leveling ECU assembly is replaced.