Toyota Tundra Service Manual: Problem Symptoms Table

Toyota Tundra Service Manual / Vehicle Interior / Lighting / Lighting System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.
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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.

Headlight (for Halogen Headlight)

Symptom	Suspected Area	Link
Both left and right low beam headlights does not illuminate.	Headlight dimmer switch circuit
	Headlight relay circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)
Left low beam headlight does not illuminate.	HEAD LL fuse	-
	No. 1 headlight bulb
	Harness or connector	-
Right low beam headlight does not illuminate.	HEAD RL fuse	-
	No. 1 headlight bulb
	Harness or connector	-
Both left and right high beam headlights does not illuminate.	Headlight dimmer switch circuit
	Headlight (HI-BEAM) circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)
Left high beam headlight does not illuminate.	HEAD LH fuse	-
	No. 1 headlight bulb
	Harness or connector	-
Right high beam headlight does not illuminate.	HEAD RH fuse	-
	No. 1 headlight bulb
	Harness or connector	-
High beam flash function does not operate.	Headlight dimmer switch circuit
High beam flash function does not operate.	Main body ECU (multiplex network body ECU)

Headlight (for LED Headlight)

Symptom	Suspected Area	Link
Both left and right low beam headlights does not illuminate.	Headlight dimmer switch circuit
	Headlight relay circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)
Left low beam headlight does not illuminate.	LED LL fuse	-
	Headlight assembly LH
	Harness or connector	-
Right low beam headlight does not illuminate.	LED RL fuse	-
	Headlight assembly RH
	Harness or connector	-
Both left and right high beam headlights does not illuminate.	Headlight dimmer switch circuit
	Headlight (HI-BEAM) circuit
	Harness or connector	-
	Main body ECU (multiplex network body ECU)
Left high beam headlight does not illuminate.	LED LH fuse	-
	Headlight assembly LH
	Harness or connector	-
Right high beam headlight does not illuminate.	LED RH fuse	-
	Headlight assembly RH
	Harness or connector	-
High beam flash function does not operate.	Headlight dimmer switch circuit
High beam flash function does not operate.	Main body ECU (multiplex network body ECU)

Fog Light (w/ Fog Light)

Symptom	Suspected Area	Link
Both left and right Fog light does not illuminate (taillight is normal).	Headlight dimmer switch circuit
	Front Fog light circuit
	Main body ECU (multiplex network body ECU)
Left Fog light does not illuminate.	Fog light bulb (for Halogen Fog Light)
	Fog light assembly LH (for LED Fog Light)
	Harness or connector	-
Right Fog light does not illuminate.	Fog light bulb (for Halogen Fog Light)
	Fog light assembly RH (for LED Fog Light)
	Harness or connector	-

Daytime Running Light

Symptom	Suspected Area	Link
Both left and right daytime running lights do not illuminate.	Headlight dimmer switch circuit
	DRL relay circuit
	Parking brake switch circuit
	Main body ECU (multiplex network body ECU)
Left daytime running light does not illuminate. (for Halogen Headlight)	Harness or connector	-
	Headlight assembly LH
Right daytime running light does not illuminate. (for Halogen Headlight)	Harness or connector	-
	Headlight assembly RH
Left daytime running light does not illuminate. (for LED Headlight)	Headlight assembly LH
	Harness or connector	-
Right daytime running light does not illuminate. (for LED Headlight)	Headlight assembly RH
	Harness or connector	-

Front Side Marker Lights, Taillight, License Plate Lights

Symptom	Suspected Area	Link
Left taillight (rear combination light assembly) do not illuminate.	Tail and stop light bulb
	Tail and stop light bulb socket
	Harness or connector	-
Right taillight (rear combination light assembly) do not illuminate.	Tail and stop light bulb
	Tail and stop light bulb socket
	Harness or connector	-
Both left and right front side marker do not illuminate.	Driver side junction block assembly
Left front side marker do not illuminate. (for Halogen Headlight)	Front side marker light bulb
	Front side marker light bulb socket LH
	Harness or connector	-
Right front side marker do not illuminate. (for Halogen Headlight)	Front side marker light bulb
	Front side marker light bulb socket RH
	Harness or connector	-
Left front side marker do not illuminate. (for LED Headlight)	Front side marker light bulb
	Front side marker light bulb socket LH
	Harness or connector	-
Right front side marker do not illuminate. (for LED Headlight)	Front side marker light bulb
	Front side marker light bulb socket RH
	Harness or connector	-
Left license plate light does not illuminate.	License plate bulb
	License plate light bulb socket
	Harness or connector	-
Right license plate light does not illuminate.	License plate bulb
	License plate light bulb socket
	Harness or connector	-
All of the taillights, front side markers and license plate lights do not illuminate.	Taillight circuit
	Main body ECU (multiplex network body ECU)

Stop Light

Symptom	Suspected Area	Link
Both left and right stop light (rear combination light assembly) does not illuminate.	STOP fuse	-
	VSV ACC relay	-
	Stop light switch assembly
	Harness or connector	-
Left stop light (rear combination light assembly) does not illuminate.	Tail and stop light bulb
	Tail and stop light bulb socket
	Harness or connector	-
Right stop light (rear combination light assembly) does not illuminate.	Tail and stop light bulb
	Tail and stop light bulb socket
	Harness or connector	-

Center Stop Light

Symptom	Suspected Area	Link
Center stop light does not illuminate.	Center stop light bulb
	Center stop light socket and wire
	Harness or connector	-

Turn Signal Light

Symptom	Suspected Area	Link
Left front turn signal light do not illuminate.	Meter/gauge system
	Front turn signal light bulb (for Halogen Headlight)
	Front turn signal light bulb (for LED Headlight)
	Front turn signal light bulb socket (for Halogen Headlight)
	Front turn signal light bulb socket (for LED Headlight)
	Harness or connector	-
Right front turn signal light do not illuminate.	Meter/gauge system
	Front turn signal light bulb (for Halogen Headlight)
	Front turn signal light bulb (for LED Headlight)
	Front turn signal light bulb socket (for Halogen Headlight)
	Front turn signal light bulb socket (for LED Headlight)
	Harness or connector	-
Left rear turn signal light do not illuminate.	Meter/gauge system
	Rear turn signal light bulb
	Rear turn signal light socket LH
	Harness or connector	-
Right rear turn signal light do not illuminate.	Meter/gauge system
	Rear turn signal light bulb
	Rear turn signal light socket RH
	Harness or connector	-
Left side turn signal light do not illuminate.	Meter/gauge system
	Outer rear view mirror sub-assembly LH
	Outer rear view mirror assembly LH
	Harness or connector	-
Right side turn signal light do not illuminate.	Meter/gauge system
	Outer rear view mirror sub-assembly RH
	Outer rear view mirror assembly RH
	Harness or connector	-
Turn signal lights do not operate in one direction.	Meter/gauge system
Turn signal lights do not operate in one direction.	Turn signal switch circuit
All turn signal lights do not operate.	Turn signal switch circuit
All turn signal lights do not operate.	Combination meter assembly
All turn signal lights do not flash at the correct speed.	Combination meter assembly

Hazard Warning Signal Light

Symptom	Suspected Area	Link
Hazard warning signal lights do not operate	Hazard warning switch circuit
Hazard warning signal lights do not operate	Combination meter assembly

Back-up Light

Symptom	Suspected Area	Link
Both left and right back-up light (rear combination light assembly) does not illuminate.	BK/UP LP fuse	-
	Back-up light relay	-
	Park/neutral position switch assembly (A760E)
	Park/neutral position switch assembly (A760F)
	Park/neutral position switch assembly (AB60E)
	Park/neutral position switch assembly (AB60F)
	Harness or connector	-
Left back-up light (rear combination light assembly) does not illuminate.	Back-up light bulb
	Back-up light bulb socket
	Harness or connector	-
Right back-up light (rear combination light assembly) does not illuminate.	Back-up light bulb
	Back-up light bulb socket
	Harness or connector	-

Light Auto Turn-off System

Symptom	Suspected Area	Link
Light auto turn-off system does not operate.	Headlight dimmer switch circuit
	Door courtesy switch circuit
	IG signal circuit
	Main body ECU (multiplex network body ECU)

Manual Headlight Beam Level Control System (for Halogen Headlight)

Symptom	Suspected Area	Link
Left headlight leveling motor does not operate.	Headlight assembly LH (headlight leveling motor LH)
Left headlight leveling motor does not operate.	Harness or connector	-
Right headlight leveling motor does not operate.	Headlight assembly RH (headlight leveling motor RH)
Right headlight leveling motor does not operate.	Harness or connector	-
Both left and right headlight leveling motors do not operate.	Headlight leveling switch
	Harness or connector	-

Manual Headlight Beam Level Control System (for LED Headlight)

Symptom	Suspected Area	Link
Left headlight leveling motor does not operate.	Headlight assembly LH (headlight leveling motor LH)
Left headlight leveling motor does not operate.	Harness or connector	-
Right headlight leveling motor does not operate.	Headlight assembly RH (headlight leveling motor RH)
Right headlight leveling motor does not operate.	Harness or connector	-
Both left and right headlight leveling motors do not operate.	Headlight leveling switch
	Harness or connector	-

Automatic High Beam System (w/ Automatic High Beam System)

Symptom	Suspected Area	Link
Automatic high beam system does not operate or operation indicator does not illuminate.	Check automatic high beam indicator light
	Check Data List (Auto H Beam STS)
	Check Active Test (Automatic High Beam Indicator)
	Check automatic high beam main switch
	Harness or connector
	Combination meter assembly
	Forward recognition camera
	Main body ECU (multiplex network body ECU)

Interior Light Power Source Control

Symptom	Suspected Area	Link
All the interior lights that receive power via the DOME CUT relay do not illuminate.	Interior light auto cut circuit
	Main body ECU (multiplex network body ECU)

Illuminated Entry System

Symptom	Suspected Area	Link
All interior light control functions do not operate under any condition.	Interior light circuit
	Interior light auto cut circuit
	Main body ECU (multiplex network body ECU)
Door lock/unlock-linked control function does not operate when doors are locked/unlocked.	Door unlock detection switch circuit
	Main body ECU (multiplex network body ECU)
Door open/close-linked control function does not operate when doors are opened/closed.	Door courtesy switch circuit
	Main body ECU (multiplex network body ECU)
Ignition switch-linked control function does not operate when ignition switch is operated	IG signal circuit
	ACC signal circuit
	Main body ECU (multiplex network body ECU)

Foot Light (w/ Foot Light)

Symptom	Suspected Area	Link
Foot light do not illuminate.	Foot light bulb
Foot light do not illuminate.	Harness or connector	-

Ignition Key Cylinder Light (w/ Ignition Key Cylinder Light)

Symptom	Suspected Area	Link
Ignition key cylinder light do not illuminate.	Transponder key coil
Ignition key cylinder light do not illuminate.	Harness or connector	-

Interior Light

Symptom	Suspected Area	Link
Interior light (roof console box assembly and No. 1 room light assembly) does not illuminate.	Interior dome light switch assembly
	Harness or connector	-
Roof console box assembly (front interior light) do not illuminate.	Roof console box assembly (front interior light)
	Harness or connector	-
No. 1 room light assembly (rear interior light) do not illuminate.	No. 1 room light assembly (rear interior light)
	Harness or connector	-

Vanity Light (w/ Vanity Light)

Symptom	Suspected Area	Link
Both left and right vanity light assembly does not illuminate.	Harness or connector	-
Left vanity light assembly does not illuminate.	Vanity light bulb	-
	Harness or connector	-
	Visor assembly LH	-
Right vanity light assembly does not illuminate.	Vanity light bulb	-
	Harness or connector	-
	Visor assembly RH	-

Cargo Light

Symptom	Suspected Area	Link
Cargo light does not illuminate.	Cargo light circuit
Cargo light does not illuminate.	Main body ECU (multiplex network body ECU)

Battery Saving Control

Symptom	Suspected Area	Link
Battery saving function does not operate.	IG signal circuit
	ACC signal circuit
	Door courtesy switch circuit
	Interior light circuit
	Door unlock detection switch circuit
	Interior light auto cut circuit
	Main body ECU (multiplex network body ECU)

Instrument Panel Illumination

Symptom	Suspected Area	Link
No instrument panel illumination turns on	Headlight dimmer switch circuit
No instrument panel illumination turns on	Main body ECU (multiplex network body ECU)

Door Mirror Foot Light (w/ Door Mirror Foot Light)

Symptom	Suspected Area	Link
Both left and right door mirror foot lights does not illuminate.	Main body ECU (multiplex network body ECU)
Left door mirror foot light do not illuminate.	Door mirror foot light circuit
	Outer mirror control ECU assembly LH (for Double Cab)
	Outer mirror control ECU assembly LH (for CrewMax)
Right door mirror foot light do not illuminate.	Door mirror foot light circuit
	Outer mirror control ECU assembly RH (for Double Cab)
	Outer mirror control ECU assembly RH (for CrewMax)

Precaution

System Description

See More:

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