Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
- Use the table below to help determine the cause of the problem symptom. 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.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Headlight and taillight system
HEADLIGHT AND TAILLIGHT SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| "Low beam" does not turn on (One side) | Headlight bulb (Low) | HEADLIGHT ASSEMBLY |
| Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT | |
| Headlight signal circuit | HEADLIGHT SIGNAL CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| "Low beam" does not turn on (Both sides) | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Headlight signal circuit | HEADLIGHT SIGNAL CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| "High beam" does not turn on (One side) | Headlight bulb (High) | HEADLIGHT ASSEMBLY |
| Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT | |
| Headlight (HI-BEAM) circuit | HEADLIGHT (HI-BEAM) CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| "High beam" does not turn on (Both sides) | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Headlight (HI-BEAM) circuit | HEADLIGHT (HI-BEAM) CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| "Flash" does not turn on (Low beam and Hi-beam are normal) | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Main body ECU | TERMINALS OF ECU | |
| Headlight is dark | Headlight bulb | HEADLIGHT ASSEMBLY |
| Taillight does not turn on (All) | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Taillight circuit | TAIL LIGHT CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| Only one taillight turns on | Rear combination light | REAR COMBINATION LIGHT ASSEMBLY |
| Daytime running light system does not operate | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Parking brake switch | PARKING BRAKE SWITCH | |
| DRL relay circuit | DRL RELAY CIRCUIT | |
| Main body ECU | TERMINALS OF ECU |
Light auto turn off system
LIGHT AUTO TURN OFF SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Light auto turn off system does not operate | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Ignition switch | - | |
| Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT | |
| Main body ECU | TERMINALS OF ECU |
Front fog light system
FRONT FOG LIGHT SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Front fog light does not turn on (All) | Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| Front fog light circuit | FRONT FOG LIGHT CIRCUIT | |
| Main body ECU | TERMINALS OF ECU | |
| Only one front fog light does not turn on | Front fog right bulb | FOG LIGHT ASSEMBLY |
Turn signal and hazard warning system
TURN SIGNAL AND HAZARD WARNING SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| "Hazard" and "Turn" do not turn on | Turn signal flasher | TURN SIGNAL FLASHER ASSEMBLY |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Hazard warning light does not turn on | Hazard warning switch circuit | HAZARD WARNING SWITCH CIRCUIT |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Turn signal flasher | TURN SIGNAL FLASHER ASSEMBLY | |
| Turn signal does not turn on | Turn signal light circuit | TURN SIGNAL LIGHT CIRCUIT |
| Headlight dimmer switch circuit | HEADLIGHT DIMMER SWITCH CIRCUIT | |
| Turn signal flasher | TURN SIGNAL FLASHER ASSEMBLY |
Stop light system
STOP LIGHT SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Stop light does not operate (All) | STOP fuse | PARTS LOCATION |
| Stop light switch | STOP LIGHT SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Rear combination light | REAR COMBINATION LIGHT ASSEMBLY | |
| Only one stop light does not operate | Rear combination light | REAR COMBINATION LIGHT ASSEMBLY |
| High mount stop light does not operate (All) | STOP fuse | PARTS LOCATION |
| High mount stop light | HIGH MOUNTED STOP LIGHT ASSEMBLY | |
| Stop light switch | STOP LIGHT SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Only one high mount stop light does not operate | High mount stop light bulb | HIGH MOUNTED STOP LIGHT ASSEMBLY |
Illuminated entry system
ILLUMINATED ENTRY SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Illuminated entry does not operate (All) | Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT |
| Illumination circuit | ILLUMINATION CIRCUIT | |
| Main body ECU | TERMINALS OF ECU |
Interior light system
INTERIOR LIGHT SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Door courtesy light does not turn on (All) | Perform ACTIVE TEST (Door courtesy light switch) | DATA LIST / ACTIVE TEST |
| Door courtesy light switch | FRONT DOOR COURTESY SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Only front door courtesy light LH does not turn on | Front door courtesy light bulb LH | DOOR COURTESY LIGHT (FOR FRONT DOOR) |
| Front door courtesy light switch LH | FRONT DOOR COURTESY SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Only front door courtesy light RH does not turn on | Front door courtesy light bulb RH | DOOR COURTESY LIGHT (FOR FRONT DOOR) |
| Front door courtesy light switch RH | FRONT DOOR COURTESY SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Only rear door courtesy light LH does not turn on | Rear door courtesy light bulb LH | DOOR COURTESY LIGHT (FOR REAR DOOR) |
| Rear door courtesy light switch LH | REAR DOOR COURTESY SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Only rear door courtesy light RH does not turn on | Rear door courtesy light bulb RH | DOOR COURTESY LIGHT (FOR REAR DOOR) |
| Rear door courtesy light switch RH | REAR DOOR COURTESY SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE |
Foot light system
FOOT LIGHT SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| Foot light does not operate | Foot light bulb | FOOTWELL LIGHT |
| Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT | |
| Illumination circuit | ILLUMINATION CIRCUIT | |
| Main body ECU | TERMINALS OF ECU |
Trailer towing
TRAILER TOWING
| Symptom | Suspected Area | See |
|---|---|---|
| Trailer towing does not operate | TOWING fuse | PARTS LOCATION |
| TOW TAIL fuse | PARTS LOCATION | |
| TOW BRK fuse | PARTS LOCATION | |
| TOWING TAIL relay | PARTS LOCATION | |
| SUB BATTERY relay | PARTS LOCATION | |
| Trailer socket | - | |
| Turn signal flasher | TURN SIGNAL FLASHER ASSEMBLY | |
| Towing brake controller | - | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE |
Others
OTHERS
| Symptom | Suspected Area | See |
|---|---|---|
| Back-up light does not operate (All) | BK/UP LP fuse | PARTS LOCATION |
| Back-up light relay | - | |
| Park / neutral position switch (A750E) | INSPECTION | |
| Park / neutral position switch (A750F) | INSPECTION | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Rear combination light | REAR COMBINATION LIGHT ASSEMBLY | |
| Only one back-up light does not operate | Rear combination light | REAR COMBINATION LIGHT ASSEMBLY |
| Vanity light does not operate (for Double Cab) | Vanity light | REMOVAL |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Cargo light does not operate | Cargo light bulb | HIGH MOUNTED STOP LIGHT ASSEMBLY |
| Cargo light circuit | CARGO LIGHT CIRCUIT | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Main body ECU | TERMINALS OF ECU | |
| Room light does not operate | Room light | ROOM LIGHT ASSEMBLY (FOR SHORT TYPE OVERHEAD CONSOLE BOX) |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Glove box illumination light does not operate | PANEL fuse | PARTS LOCATION |
| Glove box illumination light | GLOVE BOX LIGHT | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| 4WD control switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| 4WD control switch | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Drive monitor switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Drive monitor switch | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Hazard warning signal switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Hazard warning signal switch | HAZARD WARNING SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Room light switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Room light switch | ROOM LIGHT ASSEMBLY (FOR SHORT TYPE OVERHEAD CONSOLE BOX) | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Cargo light switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Cargo light switch | CARGO LIGHT SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Ashtray illumination does not operate (for Column shift) | PANEL fuse | PARTS LOCATION |
| Ashtray illumination (for Double Cab) | REMOVAL | |
| Ashtray illumination (for Regular Cab) | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| VSC OFF switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| VSC OFF switch | VSC OFF SWITCH | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Transmission control switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Transmission control switch (for Column Shift Type) | ON-VEHICLE INSPECTION | |
| Transmission control switch (for Floor Shift Type) | ON-VEHICLE INSPECTION | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Integration control and panel illumination does not operate | PANEL fuse | PARTS LOCATION |
| Integration control and panel (for Column Shift Type) | REMOVAL | |
| Integration control and panel (for Floor Shift Type) | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Curtain airbag cutoff switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Curtain airbag cutoff switch | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Seat heater switch illumination does not operate | PANEL fuse | PARTS LOCATION |
| Seat heater switch (for Column Shift Type) | REMOVAL | |
| Seat heater switch (for Floor Shift Type) | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Accessory meter illumination does not operate | PANEL fuse | PARTS LOCATION |
| Accessory meter | ON-VEHICLE INSPECTION | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Radio receiver illumination does not operate (for Built-in type amplifier) | PANEL fuse | PARTS LOCATION |
| Radio receiver (for Column Shift Type) | REMOVAL | |
| Radio receiver (for Floor Shift Type) | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE | |
| Navigation receiver illumination does not operate (for Separate type amplifier) | PANEL fuse | PARTS LOCATION |
| Navigation receiver (for Column Shift Type) | REMOVAL | |
| Navigation receiver (for Floor Shift Type) | REMOVAL | |
| Harness and connector | ELECTRONIC CIRCUIT INSPECTION PROCEDURE |