Note
Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1
*1: w/ Entry and Start System
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.*2
*2: for LED Headlight
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.
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.
Symptom | Suspected Area | Link |
---|---|---|
Left low beam headlight does not illuminate*1 | Headlight unit assembly LH | |
Headlight ECU sub-assembly LH | ||
Left low beam headlight does not illuminate*2 | No. 1 headlight bulb | |
Harness or connector | - | |
Right low beam headlight does not illuminate*1 | Headlight unit assembly RH | |
Headlight ECU sub-assembly RH | ||
Right low beam headlight does not illuminate*2 | No. 1 headlight bulb | |
Harness or connector | - | |
Both left and right low beam headlights do not illuminate*1 | Headlight dimmer switch circuit | |
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Both left and right low beam headlights do not illuminate*2 | Headlight dimmer switch circuit | |
Low beam headlight circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Left high beam headlight does not illuminate*1 | High beam headlight circuit | |
Headlight unit assembly LH | ||
Headlight ECU sub-assembly LH | ||
Left high beam headlight does not illuminate*2 | Headlight unit assembly LH | |
Harness or connector | - | |
Right high beam headlight does not illuminate*1 | High beam headlight circuit | |
Headlight unit assembly RH | ||
Headlight ECU sub-assembly RH | ||
Right high beam headlight does not illuminate*2 | Headlight unit assembly RH | |
Harness or connector | - | |
Both left and right high beam headlights do not illuminate*1 | Headlight dimmer switch circuit | |
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Both left and right high beam headlights do not illuminate*2 | Headlight dimmer switch circuit | |
High beam headlight circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
High Flash (passing function) does not operate (high beam headlights are normal) | Headlight dimmer switch circuit | |
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Left low beam headlight, high beam headlight, daytime running light and clearance light do not illuminate*1 | Power source circuit | |
Headlight ECU sub-assembly LH | ||
Right low beam headlight, high beam headlight, daytime running light and clearance light do not illuminate*1 | Power source circuit | |
Headlight ECU sub-assembly RH |
*1: for LED Headlight
*2: for Halogen Headlight
Symptom | Suspected Area | Link |
---|---|---|
Left clearance light/daytime running light does not illuminate*1 | Clearance Light/Daytime running light circuit | |
Headlight ECU sub-assembly LH | ||
Left clearance light/daytime running light does not illuminate*2 | Headlight unit assembly LH | |
Harness or connector | - | |
Right clearance light/daytime running light does not illuminate*1 | Clearance Light/Daytime running light circuit | |
Headlight ECU sub-assembly RH | ||
Right clearance light/daytime running light does not illuminate*2 | Headlight unit assembly RH | |
Harness or connector | - | |
Electric parking brake system | ||
Both left and right clearance lights do not illuminate*1 | Electric parking brake system | |
Headlight dimmer switch circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Both left and right clearance lights do not illuminate*2 | Electric parking brake system | |
Headlight dimmer switch circuit | ||
Daytime running light relay circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
*1: for LED Headlight
*2: for Halogen Headlight
Symptom | Suspected Area | Link |
---|---|---|
Left or right taillight (rear combination light assembly) do not illuminate*1 | Rear combination light assembly | |
Harness or connector | - | |
Left or right taillight (rear combination light assembly) do not illuminate*2 | Rear combination light socket and wire | |
Rear combination light LED | ||
Harness or connector | - | |
Left or right taillight (rear light assembly) does not illuminate*1 | Rear light assembly | |
Harness or connector | - | |
All of the taillights and license plate lights do not illuminate | Headlight dimmer switch circuit | |
Taillight relay circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
*1: for LED Headlight
*2: for Halogen Headlight
Symptom | Suspected Area | Link |
---|---|---|
Left or right license plate light does not illuminate | License plate light assembly | |
Harness or connector | - |
Symptom | Suspected Area | Link |
---|---|---|
Left or right stop light (rear combination light assembly) does not illuminate*1 | Rear combination light assembly | |
Harness or connector | - | |
Left or right stop light (rear combination light assembly) does not illuminate*2 | Rear combination light socket and wire | |
Rear combination light LED | ||
Harness or connector | - | |
Center stop light does not illuminate | Center stop light assembly | |
Harness or connector | - | |
All of the stop lights do not illuminate | STOP fuse | - |
Stop light switch assembly | ||
Harness or connector | - |
*1: for LED Headlight
*2: for Halogen Headlight
Symptom | Suspected Area | Link |
---|---|---|
Left or right front fog light does not illuminate*1 | Fog light assembly | |
Harness or connector | - | |
Left or right front fog light does not illuminate*2 | Fog light bulb | |
Harness or connector | - | |
Both left and right front fog lights do not illuminate (taillights are normal) | Headlight dimmer switch circuit | |
Front fog light circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
*1: for LED Type
*2: for Bulb Type
Symptom | Suspected Area | Link |
---|---|---|
Rear fog light does not illuminate (taillights are normal) | Headlight dimmer switch circuit | |
Rear fog light circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
Symptom | Suspected Area | Link |
---|---|---|
Left or right back-up light does not illuminate*1 | Rear light assembly | |
Harness or connector | - | |
Left or right back-up light does not illuminate*2 | Back-up light bulb | |
Back up light socket | ||
Harness or connector | - | |
Both left and right back-up lights do not illuminate | Park/neutral position switch assembly (for K114 CVT) | |
Park/neutral position switch assembly (for K313 CVT) | ||
Park/neutral position switch assembly (for K313F CVT) | ||
Back-up Light switch assembly (for EC6A Manual Transaxle) | ||
Back-up Light switch assembly (for EC69 Manual Transaxle) | ||
Instrument panel junction block assembly (for LHD) | ||
Instrument panel junction block assembly (for RHD) | ||
Harness or connector | - |
*1: for LED Headlight
*2: for Halogen Headlight
Symptom | Suspected Area | Link |
---|---|---|
Left or right front turn signal light does not operate*1 | Meter/gauge system | |
Headlight unit assembly LH | ||
Headlight ECU sub-assembly LH | ||
Harness or connector | - | |
Left or right front turn signal light does not operate*2 | Meter/gauge system | |
Front turn signal light bulb | ||
Front turn signal light socket | ||
Harness or connector | - | |
Left or right rear turn signal light does not operate*1 | Meter/gauge system | |
Rear combination light assembly | ||
Harness or connector | - | |
Left or right rear turn signal light does not operate*2 | Meter/gauge system | |
Rear combination light socket and wire | ||
Rear turn signal light bulb | ||
Harness or connector | - | |
Left or right side turn signal light does not operate*3 | Side turn signal light assembly | |
Outer rear view mirror assembly | ||
Harness or connector | - | |
Left or right side turn signal light does not operate*4 | Side turn signal bulb | |
Side turn signal light assembly | ||
Outer rear view mirror assembly | ||
Harness or connector | - | |
Turn signal lights do not operate in one direction | Meter/gauge system | |
Turn signal switch circuit | ||
All turn signal lights do not operate | Turn signal switch circuit | |
Combination meter assembly | ||
All turn signal lights do not flash at the correct speed | Combination meter assembly |
*1: for LED Headlight
*2: for Halogen Headlight
*3: for LED Type
*4: for Bulb Type
Symptom | Suspected Area | Link |
---|---|---|
Hazard warning signal lights do not operate | Hazard warning switch circuit | |
Combination meter assembly | ||
Hazard warning signal switch indicator does not illuminate | Hazard warning signal switch assembly | |
Combination meter assembly | ||
Harness or connector | - |
Symptom | Suspected Area | Link |
---|---|---|
Automatic light control system does not operate | Headlight dimmer switch circuit | |
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
Symptom | Suspected Area | Link |
---|---|---|
Light auto turn-off system does not operate | Headlight dimmer switch circuit | |
IG signal circuit | ||
Door courtesy switch circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |
Symptom | Suspected Area | Link |
---|---|---|
All of the door mirror foot lights do not illuminate | Power door lock control system | |
Wireless door lock control system (w/ Entry and Start System) | ||
Wireless door lock control system (w/o Entry and Start System) | ||
Entry and start system (for Entry Function) (w/ Entry and Start System) | ||
Door unlock detection switch circuit | ||
Footwell light circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) | ||
Left or right door mirror foot light does not illuminate | Door mirror foot light | |
Harness or connector | - |
Symptom | Suspected Area | Link |
---|---|---|
Follow me home system does not operate | IG signal circuit | |
Headlight dimmer switch circuit | ||
Main body ECU (Multiplex network body ECU) (for LHD) | ||
Main body ECU (Multiplex network body ECU) (for RHD) |