Problem Symptoms Table
WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
Use PROBLEM SYMPTOMS TABLE 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.
Lighting system
PROBLEM SYMPTOMS TABLE (LIGHTING SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| Headlight does not light up (Low beam) | 1. Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT |
| 2. Headlight relay circuit | HEADLIGHT RELAY CIRCUIT | |
| 3. Combination switch | - | |
| 4. Body ECU | - | |
| Headlight system does not operate (Hi beam or flash) | 1. Dimmer signal circuit | DIMMER SIGNAL CIRCUIT |
| 2. Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT | |
| 3. Combination switch | - | |
| 4. Body ECU | - | |
| Automatic light control system does not operate | 1. Light control sensor circuit | LIGHT CONTROL SWITCH CIRCUIT |
| 2. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR | |
| 3. Body ECU | - | |
| Taillight system does not light up | 1. Taillight relay circuit | TAILLIGHT RELAY CIRCUIT |
| 2. Light control switch circuit | LIGHT CONTROL SWITCH CIRCUIT | |
| 3. Light control switch | LIGHT CONTROL SWITCH | |
| 4. Body ECU | - | |
| Automatic light control system does not operate | 1. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR |
| 2. Light control switch | LIGHT CONTROL SWITCH | |
| 3. Door courtesy switch | FRONT DOOR COURTESY SWITCH | |
| 4. Wire harness | - | |
| Auto turn-off system does not operate when the driver door is opened | Driver door courtesy switch | FRONT DOOR COURTESY SWITCH |
| Headlight and taillight do not come on | 1. Body ECU | - |
| 2. Wire harness | - | |
| Headlight and taillight stay on | 1. Body ECU | - |
| 2. Wire harness | - | |
| Only one headlight comes on | 1. H-LP R-LWR fuse | - |
| 2. Body ECU | - | |
| 3. Bulb | - | |
| 4. Wire harness | - | |
| Lo-beam does not light up (all) | 1. Relay | - |
| 2. Wire harness | - | |
| Lo-beam does not light up (one side) | 1. Bulb | - |
| 2. H-LP L-LWR fuse | - | |
| 3. H-LP R-LWR fuse | - | |
| 4. Wire harness | - | |
| Hi-beam does not light up (all) | 1. Headlight dimmer switch | HEADLIGHT DIMMER SWITCH |
| 2. Body ECU | - | |
| 3. Wire harness | - | |
| Hi-beam does not light up (one side) | 1. Bulb | - |
| 2. H-LP L-LWR fuse | - | |
| 3. H-LP R-LWR fuse | - | |
| 4. Daytime running light relay | LIGHT CONTROL SWITCH | |
| 5. Wire harness | - | |
| Flash does not light up | 1. Headlight dimmer switch | HEADLIGHT DIMMER SWITCH |
| 2. Body ECU | - | |
| 3. Wire harness | - | |
| Headlight does not come on | 1. Relay | - |
| 2. Body ECU | - | |
| 3. Daytime running light relay | LIGHT CONTROL SWITCH | |
| 4. Headlight dimmer switch | HEADLIGHT DIMMER SWITCH | |
| 5. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR | |
| 6. Wire harness | - | |
| 7. Bulb | - | |
| Headlight does not come on with light control switch in HEAD | 1. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR |
| 2. Wire harness | - | |
| Headlight does no turn off with light control switch in OFF | 1. Relay | - |
| 2. Wire harness | - | |
| Headlight flickers | 1. Bulb | - |
| 2. Wire harness | - | |
| Headlight is dark | 1. Bulb | - |
| 2. Wire harness | - | |
| Taillight does not come on with light control switch in TAIL | 1. Relay | - |
| 2. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR | |
| 3. Wire harness | - | |
| Taillight does not come on with light control switch in TAIL | 1. Relay | - |
| 2. Automatic light control sensor | AUTOMATIC LIGHT CONTROL SENSOR | |
| 3. Wire harness | - | |
| Headlight does not come on with engine running and light control switch in OFF | 1. ECU-B1 fuse | - |
| 2. ECU-IG1 fuse | - | |
| 3. Body ECU | - | |
| 4. Daytime running light relay | LIGHT CONTROL SWITCH | |
| 5. Generator L terminal | - | |
| 6. Parking brake switch | - | |
| 7. Wire harness | - |
Illumination light system
PROBLEM SYMPTOMS TABLE (ILLUMINATION LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| All switch illumination light does not light up | 1. Power source circuit | POWER SOURCE CIRCUIT |
| 2. Light control rheostat | INSTALLATION | |
| 3. Body ECU | - | |
| Each switch illumination light does not light up | 1. Illumination circuit | ILLUMINATION CIRCUIT |
| 2. Body ECU | - | |
| Brightness does not change even when rheostat turned | 1. Light control rheostat | INSTALLATION |
| 2. Body ECU | - | |
| Door courtesy light does not light up | 1. Door courtesy switch circuit | DOOR COURTESY SWITCH CIRCUIT |
| 2. Body ECU | - |
Ignition switch and key unlock warning switch
PROBLEM SYMPTOMS TABLE (IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH)
| Symptom | Suspected area | Reference |
|---|---|---|
| Ignition switch cannot be set to each position | 1. Ignition switch | - |
| 2. Power source circuit | POWER SOURCE CIRCUIT | |
| Ignition key illumination does not light up | 1. Bulb | - |
| 2. Body ECU | - | |
| 3. Wire harness | - | |
| Key unlock warning system does not operate (The buzzer does not sound when the drivers door is opened with ignition switch OFF and key inserted) | 1. Key unlock warning switch | WIRING DIAGRAM |
| 2. Door courtesy switch | FRONT DOOR COURTESY SWITCH | |
| 3. Wire harness | - | |
| Key unlock warning system does not operate (The buzzer sound when the ignition switch is in ACC or ON) | 1. Ignition switch | - |
| 2. Wire harness | - |
Fog light system
PROBLEM SYMPTOMS TABLE (FOG LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| Fog light does not light up with light control switch in HEAD (headlight is normal) | 1. FOG fuse | - |
| 2. Engine room junction block relay circuit | - | |
| 3. Fog light switch | FOG LIGHT ASSEMBLY | |
| 4. Wire harness | - | |
| Fog light does not light up with light control switch in HEAD (headlight does not light up) | 1. Other parts* | - |
| 2. Wire harness | - | |
| Only one light does not light up | 1. Bulb | - |
| 2. Wire harness | - |
Turn signal light and hazard warning light system
PROBLEM SYMPTOMS TABLE (TURN SIGNAL LIGHT AND HAZARD WARNING LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| Hazard warning light and turn signal light do not light up | 1. ECU-IG2 fuse | - |
| 2. TURN HAZ fuse | - | |
| 3. Ignition switch assembly | - | |
| 4. Turn signal flasher relay | TURN SIGNAL LIGHT SWITCH | |
| 5. Wire harness | - | |
| Hazard warning light does not light up (turn is normal) | 1. Hazard warning switch | HAZARD WARNING SWITCH |
| 2. Wire harness | - | |
| Turn signal light does not light up (hazard warning light is normal) | 1. Turn signal switch | TURN SIGNAL LIGHT SWITCH |
| 2. Wire harness | - | |
| Turn signal light does not light up in one direction | 1. Turn signal switch | TURN SIGNAL LIGHT SWITCH |
| 2. Wire harness | - | |
| Only one light does not light up | 1. Bulb | - |
| 2. Wire harness | - |
Room light system
PROBLEM SYMPTOMS TABLE (ROOM LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| All lights do not come on | 1. DOME fuse | - |
| 2. Body ECU | - | |
| 3. DOME relay | - | |
| Light does not come on when driver door is opened | 1. Driver door courtesy switch | FRONT DOOR COURTESY SWITCH |
| 2. Wire harness | - | |
| Light does not come on when passenger door is opened | 1. Passenger door courtesy switch | FRONT DOOR COURTESY SWITCH |
| 2. Wire harness | - | |
| Light does not come on when rear-right door is opened | 1. Rear-right door courtesy switch | REAR DOOR COURTESY SWITCH |
| 2. Wire harness | - | |
| Light does not come on when rear-left door is opened | 1. Rear-left door courtesy switch | REAR DOOR COURTESY SWITCH |
| 2. Wire harness | - | |
| Only one of bulbs comes on | Bulb | - |
| Illumination does not fade out when all doors are closed | 1. Courtesy switch | FRONT DOOR COURTESY SWITCH |
| 2. Wire harness | - | |
| 3. Body ECU | - | |
| Illumination does not fade out immediately when ignition switch is turned to ACC or ON within 15 seconds after all doors are closed | 1. Ignition switch assembly | - |
| 2. ACC fuse | - | |
| 3. ECU-IG1 fuse | - | |
| 4. Body ECU | - | |
| 5. Wire harness | - | |
| Illumination does not fade out immediately when all doors are locked within 15 seconds after they are closed | 1. Door unlock detection switch | REMOVAL |
| 2. Wire harness | - | |
| Room light does not light up | 1. Bulb | - |
| 2. Room light | REAR ROOM LIGHT ASSEMBLY | |
| 3. Rear personal light | REAR ROOM LIGHT ASSEMBLY | |
| 4. Wire harness | - | |
| Front personal light does not light up | 1. Bulb | - |
| 2. Front personal light | REAR ROOM LIGHT ASSEMBLY | |
| 3. Room light | - | |
| 4. Wire harness | - | |
| Rear room light does not light up | 1. Bulb | - |
| 2. Rear room light | REAR ROOM LIGHT ASSEMBLY | |
| 3. Wire harness | - | |
| Vanity light does not light up | 1. Bulb | - |
| 2. Vanity light | VANITY LIGHT | |
| 3. Wire harness | - | |
| Glove compartment light does not light up | 1. Bulb | - |
| 2. Glove compartment courtesy switch | GLOVE BOX LIGHT | |
| 3. Wire harness | - | |
| Courtesy light does not light up | 1. Bulb | - |
| 2. Courtesy switch | FRONT DOOR COURTESY SWITCH | |
| 3. Wire harness | - |
Back-up light system
PROBLEM SYMPTOMS TABLE (BACK-UP LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| Back-up light does not light up | 1. GAUGE2 fuse | - |
| 2. Ignition switch assembly | - | |
| 3. Wire harness | - | |
| 4. Bulb | - | |
| Back-up light remains always on | 1. Park / neutral position switch | - |
| 2. Wire harness | - | |
| Only one light does not light up | 1. Bulb | - |
| 2. Wire harness | - |
Stop light system
PROBLEM SYMPTOMS TABLE (STOP LIGHT SYSTEM)
| Symptom | Suspected area | Reference |
|---|---|---|
| Stop light does not light up | 1. STOP fuse | - |
| 2. Stop light switch assembly | STOP LIGHT SWITCH | |
| 3. Wire harness | - | |
| Stop light always on | 1. Stop light switch assembly | STOP LIGHT SWITCH |
| 2. Wire harness | - | |
| Only one light always on | Wire harness | - |
| Only one light does not light up | 1. Bulb | - |
| 2. Wire harness | - |