Toyota Venza: Problem Symptoms Table

Toyota Venza Service Manual / Lighting (ext) / Lighting System / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

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 and Taillight

Symptom	Suspected Area	See page
One low beam headlight does not illuminate.	H-LP LH LO fuse or H-LP RH LO fuse	-
	Bulb (for Halogen Headlight)	-
	Discharge headlight bulb (for HID Headlight)
	Light control ECU (for HID Headlight)
	Headlight unit (for HID Headlight)
	Power distributor (Engine room junction block assembly)
	Harness or connector	-
Both left and right low beam headlights do not illuminate.	Light control switch circuit
	Headlight relay circuit
	Main body ECU (Driver side junction block assembly)
One high beam headlight does not illuminate.	H-LP LH HI fuse or H-LP RH HI fuse	-
	Bulb	-
	Power distributor (Engine room junction block assembly)
	Harness or connector	-
Both left and right high beam headlights do not illuminate.	Light control switch circuit
	High beam headlight circuit (for Halogen Headlight)
	Headlight solenoid circuit (for HID Headlight)
	Main body ECU (Driver side junction block assembly)
"High Flash" (passing function) headlight does not illuminate (high beam headlights are normal).	Light control switch circuit
	High beam headlight circuit
	Main body ECU (Driver side junction block assembly)
Discharge headlight bulb flickers.	Discharge headlight bulb
	Harness or connector	-
	Light control ECU
Discharge headlight bulb is dark.	Discharge headlight bulb
	Harness or connector	-
	Light control ECU
Discharge headlight bulb does not come on at intervals.	Discharge headlight bulb
	Harness or connector	-
	Light control ECU
One front parking light does not illuminate.	Bulb	-
One front parking light does not illuminate.	Harness or connector	-
One rear taillight does not illuminate.	Bulb	-
One rear taillight does not illuminate.	Harness or connector	-
One license plate light does not illuminate.	Bulb	-
One license plate light does not illuminate.	Harness or connector	-
One side marker light does not illuminate.	Bulb	-
One side marker light does not illuminate.	Harness or connector	-
All of the lights (rear taillights, front side marker lights, parking lights, license plate lights and rear side marker lights) do not illuminate.	TAIL fuse	-
	Light control switch circuit
	Taillight relay circuit
	Main body ECU (Driver side junction block assembly)

Stop Light

Symptom	Suspected Area	See page
One side stop light does not illuminate.	Rear combination light assembly
One side stop light does not illuminate.	Harness or connector	-
High mounted stop light does not illuminate.	High mounted stop light assembly
High mounted stop light does not illuminate.	Harness or connector	-
All of lights do not illuminate.	STOP fuse	-
	Stop light switch assembly
	Harness or connector	-

Front Fog Light

Symptom	Suspected Area	See page
One side front fog light does not illuminate.	Bulb	-
One side front fog light does not illuminate.	Harness or connector	-
Both left and right front fog lights do not illuminate (taillight is normal).	FOG fuse	-
	Light control switch circuit
	Front fog light circuit
	Main body ECU (Driver side junction block assembly)

Back-up Light

Symptom	Suspected Area	See page
One back-up light does not illuminate.	Bulb	-
One back-up light does not illuminate.	Harness or connector	-
Both left and right back-up lights do not illuminate.	GAUGE NO. 2 fuse	-
	Park/neutral position switch (for U660F)
	Park/neutral position switch (for U660E)
	Park/neutral position switch (for U760E)
	Park/neutral position switch (for U760F)
	Harness or connector	-

Turn Signal Light

Symptom	Suspected Area	See page
One turn signal light does not operate.	Bulb	-
One turn signal light does not operate.	Harness or connector	-
Side turn signal light does not operate.	Side turn signal light assembly
	Outer rear view mirror assembly
	Harness or connector	-
	Outer mirror control ECU assembly (w/ Seat Position Memory)
Turn signal lights do not operate in one direction.	Headlight dimmer switch assembly (Turn signal light switch)
	Turn signal flasher assembly
	Harness or connector	-
All turn signal lights do not operate.	GAUGE NO. 1 fuse	-
	HAZ fuse	-
	Headlight dimmer switch assembly (Turn signal light switch)
	Turn signal flasher assembly
	Harness or connector	-
All turn signal lights do not flash at the correct speed.	Bulb	-
	Turn signal flasher assembly
	Harness or connector	-

Hazard Warning Light

Symptom	Suspected Area	See page
Hazard warning lights do not operate.	HAZ fuse	-
	GAUGE NO. 1 fuse	-
	Hazard warning switch
	Turn signal flasher assembly
	Harness or connector	-

Automatic Light Control System

Symptom	Suspected Area	See page
Automatic light control system does not operate.	Check DTCs
	Light control switch circuit
	IG signal circuit
	Main body ECU (Driver side junction block assembly)

Light Auto Turn-off System

Symptom	Suspected Area	See page
Light auto turn-off system does not operate.	Light control switch circuit
	Door courtesy switch circuit
	IG signal circuit
	Main body ECU (Driver side junction block assembly)

Daytime Running Light System (for Halogen Headlight)

Symptom	Suspected Area	See page
Daytime running light system does not operate.	Check CAN communication system	-
	Light control switch circuit
	IG signal circuit
	Parking brake switch circuit
	High beam headlight circuit
	Main body ECU (Driver side junction block assembly)

Daytime Running Light System (for HID Headlight)

Symptom	Suspected Area	See page
Daytime running light system does not operate.	Check CAN communication system	-
	Light control switch circuit
	IG signal circuit
	Parking brake switch circuit
	Daytime running light relay circuit
	Main body ECU (Driver side junction block assembly)

Automatic High Beam System

Symptom	Suspected Area	See page
Inner rear view mirror assembly indicator light does not come on when the ignition switch is turned from off to ON.	Inner rear view mirror power source circuit
	Inner rear view mirror assembly
Inner rear view mirror assembly indicator light remains on when the inner rear view mirror assembly AUTO switch is pressed.	Inner rear view mirror assembly
Inner rear view mirror assembly indicator light flashes.	Perform operation check
Inner rear view mirror assembly indicator light flashes.	Inner rear view mirror assembly
Automatic high beam indicator light does not come on when the automatic high beam system is in standby mode (automatic light control system operates normally).	Perform operation check
	Light control switch circuit
	Combination meter assembly
Automatic high beam system does not operate (automatic high beam indicator light flashes).	Check DTCs
	Combination meter assembly
Automatic high beam system does not operate (automatic high beam indicator light is on or off).	Inner rear view mirror assembly (Camera detection malfunction*1)
	Inner rear view mirror assembly (Aiming misalignment*2)

NOTICE:

*1: Camera detection malfunctions can be detected using the Techstream. Under the following conditions, if the camera built into the inner rear view mirror assembly cannot detect other vehicles or lights correctly, it will stop automatic high beam control and turn off the automatic high beam indicator light:

When the front windshield is not clear (ice, snow or frost on the glass).

When the front windshield is dirty (sand, mud, water stains or bugs are on the glass).

*2: Aiming misalignment of the camera can be detected using the Techstream. Under the following conditions, the camera built in to the rear view mirror assembly cannot adjust its center point:

When the inner rear view mirror assembly is on an angle due to mis-installation or damage to the camera.

When the automatic aiming adjusting function of the mirror does not work correctly.

If the camera aiming is misaligned, check the following conditions:

Check if the vehicle is inclined.

Check if the windshield glass is installed correctly.

Check if the inner rear view mirror assembly is installed correctly.

Check if there is deformation of the camera or stay of the inner rear view mirror assembly.

Automatic Headlight Beam Level Control

Symptom	Suspected Area	See page
Headlight beam level control indicator light flashes.	Check DTCs
	Indicator circuit
	Headlight leveling ECU assembly
Headlight beam level control does not operate (indicator light is off).	Check the FAIL-SAFE function
	Check DTCs
	Headlight leveling ECU power source circuit
	Headlight signal circuit
	Headlight beam level control actuator circuit
	Speed signal circuit
	Headlight leveling ECU assembly
Headlight beam level control system indicator light does not come on when turning the ignition switch to ON.	Indicator circuit
	Headlight leveling ECU assembly
	Combination meter assembly
DTC information can not be detected.	Diagnosis circuit
DTC information can not be detected.	Headlight leveling ECU assembly
Initialization cannot be performed.	Check DTCs
	LVL terminal circuit
	Headlight leveling ECU assembly

NOTICE:

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.

When the headlight leveling ECU assembly is replaced, the initialization is also necessary.

Door Mirror Foot Light

Symptom	Suspected Area	See page
One door mirror foot light does not illuminate. (w/ Seat Memory Position)	Outer mirror light assembly
	Door mirror foot light circuit
	Outer mirror control ECU assembly
One door mirror foot light does not illuminate. (w/o Seat Memory Position)	Outer mirror light assembly
	Door mirror foot light circuit
	Main body ECU (Driver side junction block assembly)
Both left and right door mirror foot lights do not illuminate.	CAN communication system (w/ Seat Position Memory)
	Power door lock control system
	Wireless door lock control system (w/ smart key system)
	Wireless door lock control system (w/o smart key system)
	Smart key system (for entry function)
	Door mirror foot light circuit
	Door unlock detection switch circuit
	Main body ECU (Driver side junction block assembly)

Initialization

INITIALIZATION NOTICE: Initialize the headlight leveling ECU assembly (set the zero point of the height control sensor in the headlight leveling ECU assembly) after the vehicle heigh ...

Terminals Of Ecu

TERMINALS OF ECU 1. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) (a) Disconnect the 2A and 2F main body ECU (driver side junction block assembly) connectors. (b) Measure the voltag ...

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