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 TaillightSymptom | 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) |
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|
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 |
- |
Harness or connector |
- |
|
One rear taillight does not illuminate. |
Bulb |
- |
Harness or connector |
- |
|
One license plate light does not illuminate. |
Bulb |
- |
Harness or connector |
- |
|
One side marker light does not illuminate. |
Bulb |
- |
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) |
|
Symptom | Suspected Area | See page |
|---|---|---|
One side stop light does not illuminate. |
Rear combination light assembly |
|
Harness or connector |
- |
|
High mounted stop light does not illuminate. |
High mounted stop light assembly |
|
Harness or connector |
- |
|
All of lights do not illuminate. |
STOP fuse |
- |
Stop light switch assembly |
|
|
Harness or connector |
- |
Symptom | Suspected Area | See page |
|---|---|---|
One side front fog light does not illuminate. |
Bulb |
- |
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) |
|
Symptom | Suspected Area | See page |
|---|---|---|
One back-up light does not illuminate. |
Bulb |
- |
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 |
- |
Symptom | Suspected Area | See page |
|---|---|---|
One turn signal light does not operate. |
Bulb |
- |
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 |
- |
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 |
- |
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) |
|
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) |
|
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) |
|
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) |
|
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 |
|
|
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.
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 |
|
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.
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) |
|
Test yourself
A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.