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Problem Symptoms Table

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. HEADLAMP AND TAIL LAMP 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    Only one headlamp comes on. 1. Bulb -
    2. HEAD LH fuse (LWR, UPR) -
    3. HEAD RH fuse (LWR, UPR) -
    4. Harness or connector -
    Headlamp does not light up. - HEADLAMP DOES NOT LIGHT UP 
    "HI-Beam" does not light (All). 1. Headlamp dimmer switch INSPECTION
    2. Harness or connector -
    "HI-Beam" does not light (One side). 1. Bulb -
    2. Harness or connector -
    "Flash" does not light. 1. Headlamp Dimmer Switch INSPECTION
    2. Turn signal flasher relay INSPECTION
    3. Harness or connector -
    Headlamp is dark. 1. Bulb -
    2. Harness or connector -
    Only one tail lamp light up. 1. Bulb -
    2. Harness or connector -
    Tail lamp does not light up.
    (Headlamp is normal)
    - TAIL LAMP DOES NOT LIGHT UP 
    Tail lamp does not light up.
    (Headlamp does not light)
    1. Light Control Switch INSPECTION
    2. Harness or connector -
    Rear combination light does not light up. 1. Bulb -
    2. Harness or connector -
    Headlamp does not light up with engine running and light control switch is in OFF (Day time running light operation). 1. Turn signal flasher and DRL relay INSPECTION
    2. Generator L terminal -
    3. Parking brake switch -
    4. Multiplex network body ECU MULTIPLEX NETWORK BODY ECU 
    5. Harness or connector -
  2. AUTOMATIC LIGHT CONTROL SYSTEM 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    Automatic light control system does not operate - AUTOMATIC LIGHT CONTROL SYSTEM DOES NOT OPERATE 
  3. LIGHT AUTO CUT SYSTEM 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    Light auto turn off system does not operate. - LIGHT AUTO TURN OFF SYSTEM DOES NOT OPERATE 
    Headlamp and tail lamp do not come on. 1. Multiplex network body ECU MULTIPLEX NETWORK BODY ECU 
    2. Harness or connector -
    Headlamp and taillight stay on. 1. Multiplex network body ECU MULTIPLEX NETWORK BODY ECU 
    2. Harness or connector -
  4. FOG LAMP SYSTEM 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    Front fog lamp does not light up with light control SW HEAD (Headlamp is normal). 1. FOG Fuse -
    2. FOG relay -
    3. Fog lamp switch INSPECTION
    4. Harness or connector -
    Only one front fog lamp does not light up. 1. Bulb -
    2. Harness or connector -
  5. TURN SIGNAL AND HAZARD WARNING SYSTEM 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    "Hazard" and "Turn" do not light up. 1. IG1 Fuse -
    2. Ignition switch -
    3. Turn signal flasher ON-VEHICLE INSPECTION
    4. Harness or connector -
    Hazard warning light does not light up.
    (Turn is normal)
    1. Hazard warning switch INSPECTION
    2. Harness or connector -
    Turn signal does not light up.
    (Hazard is normal)
    1. Turn signal switch INSPECTION
    2. Harness or connector -
    Turn signal does not light up in one direction. 1. Turn signal switch INSPECTION
    2. Harness or connector -
    Only one bulb does not light up. 1. Bulb -
    2. Harness or connector -
  6. ILLUMINATED ENTRY SYSTEM 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area Reference
    Room lamp assy no. 1 does not light up. - ROOM LAMP ASSY NO. 1 DOES NOT LIGHT UP .
    Room lamp assy no.1 does not go off. - ROOM LAMP ASSY NO.1 DOES NOT GO OFF. 
    Courtesy lamp does not light up. 1. Courtesy lamp -
    2. Courtesy lamp switch -
    3. Harness or connector -
    4. Driver side junction block assy -
    Courtesy lamp does not go off. 1. Courtesy lamp switch -
    2. Harness or connector -
    3. Courtesy lamp -
    4. Driver side junction block assy -
    Side step lamp does not light up. 1. Side step lamp -
    2. Courtesy lamp switch -
    3. Harness or connector -
    4. Multiplex network body ECU -
    Side step lamp does not go off. 1. Courtesy lamp switch -
    2. Harness or connector -
    3. Side step lamp -
    4. Multiplex network body ECU -