Lighting System -- Problem Symptoms Table |
- HINT:
- 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 | See page |
| Low beam headlight on one side does not illuminate | H-LP LL fuse or H-LP RL fuse | - |
| Discharge headlight bulb (Low) | Toyota Fortuner RM000003VMS00MX.html | |
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | Toyota Fortuner RM000001H5J01WX.html | |
| High beam headlight on one side does not illuminate | H-LP LH fuse or H-LP RH fuse | - |
| Headlight bulb (High) | - | |
| Harness or connector | - | |
| Both high beam headlights do not illuminate (low beam headlights are normal) | DIM RLY relay | - |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - | |
| High beam headlights do not illuminate with "High Flash" function (passing function) | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - | |
| Low beam headlights do not turn off | H-LP RLY relay | - |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - | |
| High beam headlights do not turn off | DIM RLY relay | - |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - | |
| Discharge headlight bulb is dark | Discharge headlight bulb (Low) | Toyota Fortuner RM000003VMS00MX.html |
| Harness or connector | - | |
| Headlight light control ECU sub-assembly | Toyota Fortuner RM000001H5J01WX.html |
| Symptom | Suspected Area | See page |
| Low beam headlight on one side does not illuminate | H-LP LL fuse or H-LP RL fuse | - |
| Headlight bulb (Low) | - | |
| Harness or connector | - | |
| Both low beam headlights do not illuminate (high beam headlights are normal) | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - | |
| High beam headlight on one side does not illuminate | H-LP LH fuse or H-LP RH fuse | - |
| Headlight bulb (High) | - | |
| Harness or connector | - | |
| Both high beam headlights do not illuminate (low beam headlights are normal) | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - | |
| High beam headlights do not illuminate with "High Flash" function (passing function) | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - | |
| Low beam headlights do not turn off | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - | |
| High beam headlights do not turn off | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Clearance light on one side does not illuminate | Clearance light bulb | - |
| Harness or connector | - | |
| Taillight on one side does not illuminate (rear combination light) | Taillight bulb | - |
| Rear combination light socket and wire sub-assembly | Toyota Fortuner RM00000113L01WX.html | |
| Harness or connector | - | |
| Taillight on one side does not illuminate (rear light) | Taillight bulb | - |
| Rear light socket and wire | Toyota Fortuner RM00000113L01WX.html | |
| Harness or connector | - | |
| License plate light on one side does not illuminate | License plate light bulb | - |
| Harness or connector | - | |
| No lights illuminate | TAIL fuse | - |
| Taillight relay (w/ Automatic Light Control System) | - | |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Stop light on one side does not illuminate | Stop light bulb | - |
| Harness or connector | - | |
| Rear combination light socket and wire sub-assembly | Toyota Fortuner RM00000113L01WX.html | |
| Center stop light does not illuminate | Center stop light assembly | Toyota Fortuner RM000003S8N012X.html |
| Harness or connector | - | |
| No lights illuminate | STOP fuse | - |
| Stop light switch assembly | Toyota Fortuner RM0000018VE002X.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Front fog light on one side does not illuminate | Front fog light bulb | - |
| Harness or connector | - | |
| Both front fog lights do not illuminate (taillight is normal) | FOG fuse | - |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Hazard warning lights do not operate (turn signal lights are normal) (for Automatic Air Conditioning System) | TURN-HAZ fuse | - |
| Integration panel sub-assembly | Toyota Fortuner RM000001K3A018X.html | |
| No. 1 cooler wire | Toyota Fortuner RM000001K3A018X.html | |
| Air conditioning amplifier assembly | Toyota Fortuner RM0000012KH015X.html | |
| Turn signal flasher assembly | Toyota Fortuner RM00000113900AX.html | |
| Harness or connector | - | |
| Hazard warning lights do not operate (turn signal lights are normal) (for Manual Air Conditioning System) | TURN-HAZ fuse | - |
| Hazard warning signal switch assembly | Toyota Fortuner RM0000014DS003X.html | |
| Turn signal flasher assembly | Toyota Fortuner RM00000113900AX.html | |
| Harness or connector | - | |
| Turn signal lights do not operate (hazard warning lights are normal) | ECU-IG&GAUGE fuse | - |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Turn signal flasher assembly | Toyota Fortuner RM00000113900AX.html | |
| Harness or connector | - | |
| Hazard warning lights and turn signal lights do not operate | TURN-HAZ fuse and ECU-IG&GAUGE fuse | - |
| Turn signal flasher assembly | Toyota Fortuner RM00000113900AX.html | |
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html |
| Turn signal flasher assembly | Toyota Fortuner RM00000113900AX.html | |
| Harness or connector | - | |
| Front turn signal light does not illuminate | Front turn signal light bulb | - |
| Harness or connector | - | |
| Side turn signal light does not illuminate | Side turn signal light assembly | Toyota Fortuner RM000003S7S01CX.html |
| Outer rear view mirror assembly | Toyota Fortuner RM0000015DS05ZX.html | |
| Harness or connector | - | |
| Rear turn signal light does not illuminate | Rear turn signal light bulb | - |
| Harness or connector | - | |
| Rear combination light socket and wire sub-assembly | Toyota Fortuner RM00000113L01WX.html |
| Symptom | Suspected Area | See page |
| Back-up light on one side does not illuminate | Back-up light bulb | - |
| Rear light socket and wire | Toyota Fortuner RM00000113L01WX.html | |
| Harness or connector | - | |
| Both back-up lights do not illuminate | ECU-IG&GAUGE fuse | - |
| Back-up light switch assembly (for Manual Transmission) | Toyota Fortuner RM0000014N6002X.html | |
| Park/neutral position switch assembly (for A340E Automatic Transmission) | Toyota Fortuner RM0000010NA015X.html | |
| Park/neutral position switch assembly (for A340F Automatic Transmission) | Toyota Fortuner RM0000010NA01IX.html | |
| Park/neutral position switch assembly (for A750E Automatic Transmission) | Toyota Fortuner RM0000010NA014X.html | |
| Park/neutral position switch assembly (for A750F Automatic Transmission) | Toyota Fortuner RM0000010NA00BX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Automatic light control system does not operate | ECU-B fuse and ECU-IG&GAUGE fuse | - |
| Automatic light control sensor | Toyota Fortuner RM00000408200NX.html | |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Light auto turn-off system does not operate | ECU-B fuse and ECU-IG&GAUGE fuse | - |
| Automatic light control sensor | Toyota Fortuner RM00000408200NX.html | |
| Headlight dimmer switch assembly | Toyota Fortuner RM0000014M401IX.html | |
| Front door courtesy light switch assembly (driver side) | Toyota Fortuner RM0000014M6002X.html | |
| Combination meter assembly | Toyota Fortuner RM000000THS01WX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Manual headlight leveling control system does not operate | Headlight leveling switch | Toyota Fortuner RM000001LYS00QX.html |
| Headlight unit | Toyota Fortuner RM000001H5J01UX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| Headlight beam level control system warning light comes on | Warning light circuit | Toyota Fortuner RM000001TA3030X.html |
| Headlight leveling ECU assembly | Toyota Fortuner RM000000ZQ500LX.html | |
| Headlight beam level control does not operate (warning light is off) | Check the fail-safe function | Toyota Fortuner RM000002CE0021X.html |
| Headlight beam level control actuator circuit | Toyota Fortuner RM0000011T7033X.html | |
| Headlight signal circuit | Toyota Fortuner RM000000TZ1058X.html | |
| Headlight leveling ECU power source circuit | Toyota Fortuner RM0000011TZ053X.html | |
| Vehicle speed signal circuit | Toyota Fortuner RM000001TA201MX.html | |
| Headlight leveling ECU assembly | Toyota Fortuner RM000000ZQ500LX.html | |
| Headlight beam level control system warning light does not come on when turning the ignition switch ON | Warning light circuit | Toyota Fortuner RM000001TA3030X.html |
| Headlight leveling ECU power source circuit | Toyota Fortuner RM0000011TZ053X.html | |
| Headlight leveling ECU assembly | Toyota Fortuner RM000000ZQ500LX.html | |
| Combination meter assembly | Toyota Fortuner RM000000THS01WX.html | |
| DTC information cannot be detected | Diagnosis circuit | Toyota Fortuner RM000000X3U046X.html |
| Initialization cannot be performed | LVL terminal circuit | Toyota Fortuner RM000001IS2048X.html |
| Symptom | Suspected Area | See page |
| Map light*, No. 1 room light (for center) and No. 1 room light (for rear) do not illuminate for illuminated entry system | Theft deterrent system* | Toyota Fortuner RM000001J8K00WX.html |
| Front door courtesy light switch assembly | Toyota Fortuner RM0000014M6002X.html | |
| Rear door courtesy light switch assembly | Toyota Fortuner RM0000014M5002X.html | |
| Back door lock assembly (back door courtesy light switch) | Toyota Fortuner RM000001J0L001X.html | |
| Harness or connector | - | |
| Combination meter assembly | Toyota Fortuner RM000000THS01WX.html | |
| Theft warning ECU assembly* | - | |
| Ignition key cylinder light does not illuminate for illuminated entry system (w/ Theft Deterrent System) | Theft deterrent system | Toyota Fortuner RM000001J8K00WX.html |
| Transponder key amplifier | Toyota Fortuner RM0000014DW002X.html | |
| Front door courtesy light switch assembly | Toyota Fortuner RM0000014M6002X.html | |
| Rear door courtesy light switch assembly | Toyota Fortuner RM0000014M5002X.html | |
| Back door lock assembly (back door courtesy light switch) | Toyota Fortuner RM000001J0L001X.html | |
| Harness or connector | - | |
| Combination meter assembly | Toyota Fortuner RM000000THS01WX.html | |
| Theft warning ECU assembly | - | |
| Ignition key cylinder light does not illuminate for illuminated entry system (w/o Theft Deterrent System) | Wireless door lock control system | Toyota Fortuner RM000000Z4P00BX.html |
| Transponder key amplifier | Toyota Fortuner RM0000014DW002X.html | |
| Front door courtesy light switch assembly (driver side) | Toyota Fortuner RM0000014M6002X.html | |
| Harness or connector | - | |
| Combination meter assembly | Toyota Fortuner RM000000THS01WX.html | |
| Driver side junction block assembly (integration relay) | - |
- *: w/ Theft Deterrent System
| Symptom | Suspected Area | See page |
| Map light does not illuminate | Map light bulb | - |
| Map light assembly | Toyota Fortuner RM000001GEB00NX.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| No. 1 room light (for center) does not illuminate | No. 1 room light bulb (for center) | - |
| No. 1 room light assembly (for center) | Toyota Fortuner RM0000014M3002X.html | |
| Harness or connector | - |
| Symptom | Suspected Area | See page |
| No. 1 room light (for rear) does not illuminate | No. 1 room light bulb (for rear) | - |
| No. 1 room light assembly (for rear) | Toyota Fortuner RM0000014M3002X.html | |
| Harness or connector | - |