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.

Headlight System
Symptom Suspected Area See page
One LO-beam headlight does not illuminate H-LP L LWR fuse or H-LP R LWR fuse -
Bulb -
Light control ECU

Click here

Wire harness -
Both left and right LO-beam headlights do not illuminate MAIN fuse -
HEAD LP relay

Click here

Headlight relay circuit

Click here

Light control switch circuit

Click here

Headlight signal circuit

Click here

Main body ECU RH (Cowl side junction block RH) -
One HI-beam headlight does illuminate Bulb -
Wire harness -
Front controller (Multiplex Network Body ECU) -
Both left and right HI-beam headlights do not illuminate FR CTRL-B fuse -
Headlight (HI-BEAM) circuit

Click here

Light control switch circuit

Click here

Headlight signal circuit

Click here

Front controller (Multiplex Network Body ECU) -
Main body ECU RH (Cowl side junction block RH) -
"Flash" headlight does not illuminate Light control switch circuit

Click here

Main body ECU RH (Cowl side junction block RH) -
Front controller (Multiplex Network Body ECU) -
When the headlight dimmer switch is moved to the HI-beam position, the LO-beam of the discharge headlights remains on, but the illumination area of the discharge headlights is not increased. (Bi-function does not work.) Headlight (HI-BEAM) circuit

Click here

Headlight assembly

Click here

Daytime Running Light System
Symptom Suspected Area See page
Daytime running light system does not operate Satellite switch

Click here

Light control switch circuit

Click here

Wire harness -
Daytime running light relay circuit

Click here

Front controller (Multiplex Network Body ECU) -
Main body ECU RH (Cowl side junction block RH) -
Combination meter assembly

Click here

Taillight System
Symptom Suspected Area See page
Parking light does not operate Headlight assembly

Click here

Wire harness -
Front controller (Multiplex Network Body ECU) -
One taillight does not illuminate Rear combination light assembly

Click here

Rear light assembly

Click here

Wire harness -
Taillight system does not operate (Taillights, parking lights and license plate lights do not illuminate) TAIL fuse and FR TAIL fuse -
Taillight circuit

Click here

Light control switch circuit

Click here

Front controller (Multiplex Network Body ECU) -
Main body ECU LH (Cowl side junction block LH) -
Main body ECU RH (Cowl side junction block RH) -
Stop Light System
Symptom Suspected Area See page
Stop light system does not operate STOP SW fuse -
Stop light switch

Click here

Stop light control relay

Click here

BRK-LP relay

Click here

Rear combination light assembly

Click here

Wire harness -
One side stop light does not illuminate Rear combination light assembly

Click here

Wire harness -
High mounted stop light does not illuminate High mounted stop light assembly

Click here

Wire harness -
Front Fog Light System
Symptom Suspected Area See page
One fog light does not illuminate Bulb -
Wire harness -
Both left and right fog lights do not illuminate FR FOG fuse -
Front fog light circuit

Click here

Light control switch circuit

Click here

Front controller (Multiplex Network Body ECU) -
Main body ECU RH (Cowl side junction block RH) -
Rear Fog Light System
Symptom Suspected Area See page
One side fog light does not illuminate Bulb -
Wire harness -
Both left and right fog lights do not illuminate RR FOG fuse -
Light control switch circuit

Click here

Rear fog light circuit

Click here

Main body ECU LH (Cowl side junction block LH) -
Turn Signal Light System
Symptom Suspected Area See page
Hazard warning light does not operate TURN-HAZ fuse -
LH-IG fuse -
Turn signal flasher assembly (for LHD)

Click here

Turn signal flasher assembly (for RHD)

Click here

Hazard warning switch

Click here

Turn signal light circuit

Click here

Wire harness -
Main body ECU RH (Cowl side junction block RH) -
One turn signal light does not operate Bulb -
Turn signal flasher assembly (for LHD)

Click here

Turn signal flasher assembly (for RHD)

Click here

Turn signal light circuit

Click here

Headlight assembly

Click here

Rear combination light assembly

Click here

Main body ECU LH (Cowl side junction block LH) -
All turn signal lights do not flash TURN-HAZ fuse -
LH-IG fuse -
Turn signal light circuit

Click here

Light control switch circuit

Click here

Hazard warning switch

Click here

Main body ECU LH (Cowl side junction block LH) -
All turn signal lights do not flash at the correct speed Bulb -
Turn signal flasher assembly (for LHD)

Click here

Turn signal flasher assembly (for RHD)

Click here

Headlight assembly

Click here

Rear combination light assembly

Click here

Wire harness -
Back-up Light System
Symptom Suspected Area See page
One back-up light does not illuminate Bulb -
Wire harness -
Both left and right back-up lights do not illuminate LH-IG fuse -
Park/Neutral position switch

Click here

Wire harness -
License Plate Light System
Symptom Suspected Area See page
One license plate light does not illuminate License plate light assembly

Click here

Wire harness -
Both left and right license plate lights do not illuminate TAIL fuse -
License plate light assembly

Click here

Wire harness -
Door Mirror Foot Light System
Symptom Suspected Area See page
Door mirror foot lights do not illuminate DOME fuse -
Door mirror foot light (Outer rear view mirror)

Click here

Door mirror foot light circuit

Click here

Interior light switch signal circuit

Click here

Overhead junction block (Interior light switch)

Click here

Main body ECU LH (Cowl side junction block LH) -
Main body ECU RH (Cowl side junction block RH) -
Automatic Headlight Beam Level Control System
Symptom Suspected Area See page
A malfunction message is displayed in the multi-information display (Headlight beam leveling control system operates) Multiplex communication system

Click here

CAN communication system

Click here

Speed signal circuit

Click here

Indicator circuit

Click here

Generator signal circuit

Click here

Headlight leveling ECU assembly

Click here

Main body ECU LH (Cowl side junction block LH) -
Combination meter assembly

Click here

Headlight beam level control system does not operate (A malfunction message is displayed in the multi-information display) Height control sensor circuit

Click here

Headlight beam level control actuator circuit

Click here

Headlight leveling ECU assembly

Click here

Headlight beam level control system does not operate (A malfunction message is not displayed in the multi-information display) Multiplex communication system

Click here

CAN communication system

Click here

Headlight leveling ECU power source circuit

Click here

Headlight relay operation signal circuit

Click here

Generator signal circuit

Click here

Headlight leveling ECU assembly

Click here

Main body ECU LH (Cowl side junction block LH) -