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Problem Symptoms Table

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. HEADLIGHT AND TAILLIGHT SYSTEM 
    PROBLEM SYMPTOMS CHART - HEADLIGHT AND TAILLIGHT SYSTEM

    Symptom Suspected area Refer to
    "Low beam" does not comes on (One side). 1. MAIN fuse, H-LP L LWR fuse, H-LP R LWR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Headlight relay circuit HEADLIGHT RELAY CIRCUIT 
    5. Instrument panel junction block assembly -
    "Low beam" does not come on (Both side). 1. MAIN fuse, H-LP L LWR fuse, H-LP R LWR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Headlight relay circuit HEADLIGHT RELAY CIRCUIT 
    5. Instrument panel junction block assembly -
    "High beam" does not come on (One side). 1. MAIN fuse, H-LP L UPR fuse, H-LP R UPR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Dimmer relay circuit DRL RELAY CIRCUIT 
    5. Instrument panel junction block assembly -
    "High beam" does not comes on (Both side). 1. MAIN fuse, H-LP L UPR fuse, H-LP R UPR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Dimmer relay circuit DRL RELAY CIRCUIT 
    5. Instrument panel junction block assembly -
    "Low beam" and" High beam" does not come on (One side). 1. MAIN fuse, DRL fuse, H-LP L UPR fuse, H-LP R UPR fuse, H-LP L LWR fuse, H-LP R LWR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Headlight relay circuit HEADLIGHT RELAY CIRCUIT 
    5. Dimmer relay circuit DRL RELAY CIRCUIT 
    6. Instrument panel junction block assembly -
    "Low beam" and "High beam" do not come on (Both side). 1. MAIN fuse, DRL fuse, H-LP L UPR fuse, H-LP R UPR fuse, H-LP L LWR fuse, H-LP R LWR fuse -
    2. Bulb -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Headlight relay circuit HEADLIGHT RELAY CIRCUIT 
    5. Dimmer relay circuit DRL RELAY CIRCUIT 
    6. Instrument panel junction block assembly -
    "Flash" do not come on. (Low beam and Hi-Beam are normal) 1. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    2. Instrument panel junction block assembly -
    Headlight is dark. 1. Bulb -
    2. Wire harness or connector -
    Taillight does not come on (All). 1. TAIL fuse -
    2. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    3. TAIL relay circuit TAILLIGHT RELAY CIRCUIT 
    4. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    5. Door courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT 
    6. Instrument panel junction block assembly -
    Only one taillight comes on. 1. Bulb -
    2. Wire harness or connector -
    Rear combination light does not come on. 1. Rear combination light assembly -
    2. Wire harness or connector -
    Daytime running light system does not operate. 1. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    2. Parking brake switch circuit PARKING BRAKE SWITCH CIRCUIT 
    3. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    4. Dimmer relay circuit DRL RELAY CIRCUIT 
    5. Instrument panel junction block assembly -
  2. AUTOMATIC LIGHT CONTROL SYSTEM 
    PROBLEM SYMPTOMS CHART - AUTOMATIC LIGHT CONTROL SYSTEM

    Symptom Suspected area Refer to
    Automatic light control system does not operate. 1. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    2. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    3. Automatic light control sensor circuit AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT 
    4. Instrument panel junction block assembly -
  3. LIGHT AUTO TURN OFF SYSTEM 
    PROBLEM SYMPTOMS CHART - LIGHT AUTO TURN OFF SYSTEM

    Symptom Suspected area Refer to
    Light auto turn off system does not operate. 1. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    2. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    3. Door courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT 
    4. Instrument panel junction block assembly -
  4. FOG LIGHT SYSTEM 
    PROBLEM SYMPTOMS CHART - FOG LIGHT SYSTEM

    Symptom Suspected area Refer to
    Front fog light does not come on with light control switch in TAIL or HEAD position. 1. FOG fuse -
    2. FOG, TAIL relay -
    3. Light control switch circuit LIGHT CONTROL SWITCH CIRCUIT 
    4. Front fog light circuit FRONT FOG LIGHT CIRCUIT 
    5. Instrument panel junction block assembly -
    Only one front fog light does not come on. 1. Bulb -
    2. Wire harness or connector -
  5. TURN SIGNAL AND HAZARD WARNING SYSTEM 
    PROBLEM SYMPTOMS CHART - TURN SIGNAL AND HAZARD WARNING SYSTEM

    Symptom Suspected area Refer to
    "Hazard" and "Turn" do not come on. 1. HAZ fuse -
    2. GAUGE fuse -
    3. IG1 relay -
    4. Ignition switch -
    5. Turn signal flasher relay TURN SIGNAL LIGHT SWITCH 
    6. Wire harness or connector -
    Hazard warning light does not come on (Turn is normal). 1. Hazard warning switch HAZARD WARNING SWITCH 
    2. Wire harness or connector -
    Turn signal does not come on (Hazard is normal). 1. Headlight dimmer switch (turn signal switch) HEADLIGHT DIMMER SWITCH 
    2. Wire harness or connector -
    Turn signal does not come on in one direction. 1. Headlight dimmer switch (turn signal switch) HEADLIGHT DIMMER SWITCH 
    2. Wire harness or connector -
    Only one bulb does not come on. 1. Bulb -
    2. Wire harness or connector -
  6. STOP LIGHT SYSTEM 
    PROBLEM SYMPTOMS CHART - STOP LIGHT SYSTEM

    Symptom Suspected area Refer to
    Stop light does not operate (All). 1. STOP fuse -
    2. BRK relay -
    3. Stop light switch STOP LIGHT SWITCH 
    4. Rear Junction Block -
    5. Wire harness or connector -
    Only one stop light does not operate. 1. Rear Junction Block -
    2. Rear combination light assembly -
    3. Wire harness or connector -
  7. ILLUMINATED ENTRY SYSTEM 
    PROBLEM SYMPTOMS CHART - ILLUMINATED ENTRY SYSTEM

    Symptom Suspected area Refer to
    Illuminated entry of Multiplex network body ECU control does not operate (All). 1. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    2. Door lock position circuit DOOR LOCK POSITION CIRCUIT 
    3. Door courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT 
    4. Illumination circuit ILLUMINATION CIRCUIT 
    5. Instrument panel junction block assembly -
  8. OVERHEAD CONSOLE ILLUMINATION SYSTEM 
    PROBLEM SYMPTOMS CHART - OVERHEAD CONSOLE ILLUMINATION SYSTEM

    Symptom Suspected area Refer to
    Overhead console illumination of multiplex network body ECU control does not operate. 1. Overhead ECU -
    2. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    3. Overhead console illumination circuit OVERHEAD CONSOLE ILLUMINATION LIGHT CIRCUIT 
    4. Instrument panel junction block assembly -
  9. STEP LIGHT SYSTEM 
    PROBLEM SYMPTOMS CHART - STEP LIGHT SYSTEM

    Symptom Suspected area Refer to
    Step light of body ECU control does not operate. 1. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    2. Park/neutral position switch INSPECTION
    3. Door lock position circuit DOOR LOCK POSITION CIRCUIT 
    4. Door courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT 
    5. Step illumination circuit STEP ILLUMINATION CIRCUIT 
    6. Instrument panel junction block assembly -
  10. INSIDE HANDLE ILLUMINATION LIGHT SYSTEM 
    PROBLEM SYMPTOMS CHART - INSIDE HANDLE ILLUMINATION LIGHT SYSTEM

    Symptom Suspected area Refer to
    Inside handle illumination light of body ECU control does not operate. 1. Ignition switch circuit IGNITION SWITCH CIRCUIT 
    2. Park/neutral position switch INSPECTION
    3. Door lock position circuit DOOR LOCK POSITION CIRCUIT 
    4. Door courtesy switch circuit DOOR COURTESY SWITCH CIRCUIT 
    5. Inside handle illumination light circuit INSIDE HANDLE ILLUMINATION LIGHT CIRCUIT 
    6. Instrument panel junction block assembly -
  11. HEADLIGHT BEAM LEVEL CONTROL SYSTEM 
    PROBLEM SYMPTOMS CHART - HEADLIGHT BEAM LEVEL CONTROL SYSTEM

    Symptom Suspected area Refer to
    Headlight beam level control system does not operate. 1. Headlight beam level control actuator circuit HEADLIGHT BEAM LEVEL CONTROL ACTUATOR CIRCUIT 
    2. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
    3. Headlight beam level control ECU communication circuit HEADLIGHT BEAM LEVEL CONTROL ECU COMMUNICATION CIRCUIT 
    4. Headlight beam level control ECU power source circuit HEADLIGHT BEAM LEVEL CONTROL ECU POWER SOURCE CIRCUIT 
    5. Headlight beam level control ECU -
    Headlight beam warning light comes on (Headlight beam level control is normal). 1. Combination meter assembly -
    2. Wire harness or connector -
    3. Headlight beam level control ECU -
    Headlight beam warning light does not come on (Headlight beam level control is normal). 1. GAUGE fuse -
    2. Combination meter assembly -
    3. Wire harness or connector -
    4. Headlight beam level control ECU -
  12. AFS 
    PROBLEM SYMPTOMS CHART - AFS

    Symptom Suspected area Refer to
    AFS does not operate. (Does not initialize) 1. AFS ECU power source circuit AFS ECU POWER SOURCE CIRCUIT 
    2. AFS ECU -
    Does not initialize. (AFS is normal) 1. BEAN communication malfunction DTC B2419 BEAN COMMUNICATION MALFUNCTION 
    2. Vehicle speed sensor malfunction DTC B2415 VEHICLE SPEED SENSOR MALFUNCTION 
    3. AFS ECU -
    Only one swivel motor is not initialized. 1. Headlight assembly or swivel motor stuck -
    2. Headlight swivel ECU communication malfunction DTC B2410 HEADLIGHT SWIVEL ECU LH COMMUNICATION MALFUNCTION; DTC B2411 HEADLIGHT SWIVEL ECU RH COMMUNICATION MALFUNCTION 
    3. Headlight swivel motor malfunction DTC B2412 HEADLIGHT SWIVEL MOTOR LH MALFUNCTION; DTC B2413 HEADLIGHT SWIVEL MOTOR RH MALFUNCTION 
    4. AFS ECU -
    Each side swivel motor is not initialized. 1. AFS ECU power source circuit AFS ECU POWER SOURCE CIRCUIT 
    2. Headlight swivel ECU communication malfunction DTC B2410 HEADLIGHT SWIVEL ECU LH COMMUNICATION MALFUNCTION; DTC B2411 HEADLIGHT SWIVEL ECU RH COMMUNICATION MALFUNCTION 
    3. AFS ECU -
    Headlight leveling motor is not initialized. 1. Headlight beam level control motor malfunction DTC B2417 HEADLIGHT BEAM LEVEL CONTROL MOTOR LH MALFUNCTION; DTC B2418 HEADLIGHT BEAM LEVEL CONTROL MOTOR RH MALFUNCTION 
    2. AFS ECU -
    Only swivel control does not operate or malfunction. 1. Steering sensor calibration malfunction (Go to RE-INITIALIZATION) INITIALIZATION 
    2. Steering position sensor malfunction DTC B2414 STEERING POSITION SENSOR MALFUNCTION 
    3. Vehicle speed sensor malfunction DTC B2415 VEHICLE SPEED SENSOR MALFUNCTION 
    4. BEAN communication malfunction DTC B2419 BEAN COMMUNICATION MALFUNCTION 
    5. Headlight swivel ECU communication malfunction DTC B2410 HEADLIGHT SWIVEL ECU LH COMMUNICATION MALFUNCTION; DTC B2411 HEADLIGHT SWIVEL ECU RH COMMUNICATION MALFUNCTION 
    6. Headlight swivel motor malfunction DTC B2412 HEADLIGHT SWIVEL MOTOR LH MALFUNCTION; DTC B2413 HEADLIGHT SWIVEL MOTOR RH MALFUNCTION 
    7. AFS ECU -
    Swivel control and leveling control does not operate. 1. Height control sensor malfunction DTC B2416 HEIGHT CONTROL SENSOR MALFUNCTION 
    2. AFS ECU -
    AFS OFF indicator light does not come on. 1. Bulb -
    2. Combination meter assembly -
    3. AFS OFF switch circuit AFS OFF SWITCH CIRCUIT 
    4. AFS ECU -
  13. OTHERS 
    PROBLEM SYMPTOMS CHART - OTHERS

    Symptom Suspected area Refer to
    Vanity light does not operate. 1. Bulb -
    2. Wire harness or connector -
    Back up light does not come on (All). 1. GAUGE Fuse -
    2. IG1 relay -
    3. Park / neutral position switch -
    4. Wire harness or connector -
    Rear interior light, back door courtesy light and luggage light does not come on (All). 1. Bulb -
    2. TAIL fuse -
    3. TAIL relay -
    4. Wire harness or connector -
    5. Instrument panel junction block assembly -
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