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 | See page |
|---|---|---|
| Low beam headlight on one side does not illuminate | H-LP LL fuse or H-LP RL fuse | - |
| Headlight bulb | - | |
| Harness or connector | - | |
| High beam headlight on one side does not illuminate | H-LP LH fuse or H-LP RH fuse | - |
| Headlight bulb | - | |
| Harness or connector | - | |
| Both high beam headlights do not illuminate (low beam headlights are normal) | DIM relay | - |
| Headlight dimmer switch assembly | ||
| Harness or connector | - | |
| High beam headlights do not illuminate with "High Flash" function (passing function) | Headlight dimmer switch assembly | |
| Harness or connector | - | |
| Low beam headlights do not turn off | H-LP relay | |
| Headlight dimmer switch assembly | ||
| Harness or connector | - | |
| High beam headlights do not turn off | DIM relay | - |
| Headlight dimmer switch assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Low beam headlight on one side does not illuminate | Headlight bulb | - |
| Harness or connector | - | |
| Both low beam headlights do not illuminate (high beam headlights are normal) | Headlight dimmer switch assembly | |
| Harness or connector | - | |
| High beam headlight on one side does not illuminate | Headlight bulb | - |
| Harness or connector | - | |
| Both high beam headlights do not illuminate (low beam headlights are normal) | Headlight dimmer switch assembly | |
| Harness or connector | - | |
| High beam headlights do not illuminate with "High Flash" function (passing function) | Headlight dimmer switch assembly | |
| Harness or connector | - | |
| Both low beam and high beam headlights on one side do not illuminate | H-LP LH fuse or H-LP RH fuse | - |
| Harness or connector | - | |
| Low beam headlights do not turn off | Headlight dimmer switch assembly | |
| Harness or connector | - | |
| High beam headlights do not turn off | Headlight dimmer switch assembly | |
| 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 | Taillight bulb | - |
| Rear combination light socket and wire sub-assembly | ||
| 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* | - | |
| Headlight dimmer switch assembly | ||
| Harness or connector | - |
*: w/ Automatic Light Control System
| 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 | ||
| Center stop light does not illuminate (w/ Center Stop Light) | Center stop light assembly | |
| Harness or connector | - | |
| No lights illuminate | STOP fuse | - |
| Stop light switch assembly | ||
| 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 | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear fog light do not illuminate (taillight is normal) | Rear fog light relay | - |
| Headlight dimmer switch assembly*1 | ||
| Rear fog light switch*2 | ||
| Harness or connector | - | |
| Rear combination light socket and wire sub-assembly |
*1: w/o Automatic Light Control System
*2: w/ Automatic Light Control System
| 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 | ||
| No. 1 cooler wire | ||
| Air conditioning amplifier assembly | ||
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| Hazard warning lights do not operate (turn signal lights are normal) (except Automatic Air Conditioning System) | TURN-HAZ fuse | - |
| Hazard warning signal switch assembly | ||
| Turn signal flasher assembly | ||
| Harness or connector | - | |
| Turn signal lights do not operate (hazard warning lights are normal) | ECU-IG&GAUGE fuse | - |
| Headlight dimmer switch assembly | ||
| Turn signal flasher assembly | ||
| 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 | ||
| Harness or connector | - | |
| Turn signal lights do not operate in one direction | Headlight dimmer switch assembly | |
| Turn signal flasher assembly | ||
| 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 (w/ Front Fender Type Side Turn Signal Light) | Side turn signal light bulb | - |
| Harness or connector | - | |
| Side turn signal light does not illuminate (w/o Front Fender Type Side Turn Signal Light) | Side turn signal light assembly | |
| Outer rear view mirror assembly | ||
| 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 |
| Symptom | Suspected Area | See page |
|---|---|---|
| Back-up light on one side does not illuminate | Back-up light bulb | - |
| Rear combination light socket and wire sub-assembly | ||
| Harness or connector | - | |
| Both back-up lights do not illuminate | ECU-IG&GAUGE fuse | - |
| Back-up light switch assembly (for G58 Manual Transmission) | ||
| Back-up light switch assembly (for G58F Manual Transmission) | ||
| Back-up light switch assembly (for R150 / R151 / R156 Manual Transmission) | ||
| Back-up light switch assembly (for R150F / R151F / R156F Manual Transmission) | ||
| Back-up light switch assembly (for G50 / G55 Manual Transmission) | ||
| Park/neutral position switch assembly (for A340E Automatic Transmission) | ||
| Park/neutral position switch assembly (for A343E Automatic Transmission) | ||
| Park/neutral position switch assembly (for A343F Automatic Transmission) | ||
| Park/neutral position switch assembly (for A750E Automatic Transmission) | ||
| Park/neutral position switch assembly (for A750F Automatic Transmission) | ||
| Park/neutral position switch assembly (for A340F Automatic Transmission) | ||
| 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 | ||
| Headlight dimmer switch assembly | ||
| 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 | ||
| Headlight dimmer switch assembly | ||
| Front door courtesy light switch assembly (driver side) | ||
| Combination meter assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Manual headlight leveling control system does not operate | Headlight leveling switch | |
| Headlight assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| Map light*1, *2 and No. 1 room light do not illuminate for illuminated entry system | Theft deterrent system*2 | |
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly*3 | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Theft warning ECU assembly*2 | - | |
| Ignition key cylinder light does not illuminate for illuminated entry system (w/ Ignition Key Cylinder Light, w/ Theft Deterrent System) | Theft deterrent system | |
| Ignition Key cylinder light | ||
| Front door courtesy light switch assembly | ||
| Rear door courtesy light switch assembly*3 | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Theft warning ECU assembly | - | |
| Ignition key cylinder light does not illuminate for illuminated entry system (w/ Ignition Key Cylinder Light, w/o Theft Deterrent System) | Wireless door lock control system*4 | |
| Ignition Key cylinder light | ||
| Front door courtesy light switch assembly (driver side) | ||
| Harness or connector | - | |
| Combination meter assembly | ||
| Driver side junction block assembly (integration relay) | - |
*1: w/ Map Light
*2: w/ Theft Deterrent System
*3: for Double Cab
*4: w/ Wireless Door Lock Control System
| Symptom | Suspected Area | See page |
|---|---|---|
| Map light does not illuminate | Map light bulb | - |
| Map light assembly | ||
| Harness or connector | - |
| Symptom | Suspected Area | See page |
|---|---|---|
| No. 1 room light does not illuminate | No. 1 room light bulb | - |
| No. 1 room light assembly | ||
| Harness or connector | - |