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Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting >> Lighting System >> System Description

System Description

  1. FUNCTION OF MAIN COMPONENTS 
    FUNCTION OF MAIN COMPONENTS

    Components Function
    Automatic light control sensor Detects brightness around vehicle and sends information to main body ECU RH
    Hazard warning switch On or off state is sent to main body ECU RH
    Stop light switch Sends brake pedal state to rear multiplex network ECU
    Power switch Detects ON (IG), ON (ACC), OFF operation
    Door courtesy switch Detects door open / close state and sends information to main body ECU RH
    Shift position sensor Detects shift position and sends information to hybrid vehicle control ECU
    Swivel motor Moves headlights laterally according to information from AFS ECU, and sends corresponding information to AFS ECU
    Parking brake switch Detects parking brake state and sends information to skid control ECU
    Headlight leveling actuator Moves headlights up and down according to information from AFS ECU
    Height control sensor Detects vehicle height and sends corresponding information to AFS ECU
  2. OPERATION DESCRIPTION 
    1. Manual lighting system (Front lighting system)
      1. The main body ECU RH receives the following signals (A):
        • Light switch tail signal
        • Light switch head signal
        • Light switch high beam signal
        • Front fog switch signal
        • Lighting system passing signal
      2. The main body ECU RH sends the following signals to the rear multiplex network ECU based on the signal listed in A (B):
        • Headlight ON demand signal:

          Sent when light switch head signal is received.

        • Taillight ON demand signal:

          Sent when light switch tail signal and light switch head signal are received.

        • High beam ON signal:

          Sent when light switch high beam signal is received.

        • Front fog light ON signal:

          Sent when light switch tail and front fog switch signals are received.

      3. The rear multiplex network ECU controls the following parts based on the signals listed in B:
        • Headlight (low)
        • Headlight (high)
        • Clearance light
        • Front fog light
    2. Manual lighting system (Rear lighting system)
      1. The main body ECU RH receives the following signals (A):

        Light switch tail signal

      2. The main body ECU RH sends the following signals to the front light ECU based on the signal listed in A (B):
        • Taillight ON demand signal:

          Sent when light switch tail signal and light switch head signal are received.

      3. The front light ECU controls the following parts based on the signals listed in B:
        • Taillight
        • License plate light
    3. Automatic light control system
      1. The main body ECU RH receives the following signals (A):
        • Light switch auto signal
        • Automatic light control sensor signal
      2. The main body ECU LH sends the following signals to the front light ECU and rear multiplex network ECU based on the signal listed in A (B):
        • Headlight ON demand signal:

          Sent according to the illumination information from the automatic light control sensor when the light switch auto signal is received.

        • Taillight ON demand signal:

          Sent according to the illumination information from the automatic light control sensor when the light switch auto signal is received.

      3. The front light ECU controls the following parts based on the signals listed in B:
        • Headlight (low)
        • Clearance light
      4. The rear multiplex network ECU controls the following parts based on the signals listed in B:
        • Taillight
        • License plate light
    4. Turn signal light system
      1. The main body ECU LH receives the following signals (A):
        • Right turn signal
        • Left turn signal
      2. The main body ECU LH sends the following signals to the turn signal relay based on the signal listed in A (B):
        • Right turn ON demand signal

          Sent when the right turn signal is received.

        • Left turn ON demand signal

          Sent when the left turn signal is received.

      3. The turn signal relay controls the following parts based on the signals listed in B
        • Right turn signal light
        • Left turn signal light
    5. Light auto cut system
      1. The main body ECU RH receives the following signals (A):
        • Light switch tail signal
        • Light switch head signal
        • Light switch auto signal
        • Front fog switch signal
        • Power switch signal
        • Automatic light control sensor signal
        • Driver's seat courtesy switch signal
      2. The main body ECU RH sends the following signals to the main body ECU LH based on the signal listed in A (B):
        • Headlight ON demand signal

          Terminates communication when the power switch signal terminates and the driver seat courtesy switch signal is received while sending the headlight ON demand signal. The headlight ON demand signal results from receiving the light switch head signal or the illumination information from the light control signal.

        • Taillight ON demand signal

          Terminates communication when the power switch signal terminates and the driver seat courtesy switch signal is received while sending the taillight ON demand signal. The taillight ON demand signal results from receiving the light switch tail signal or illumination information from the light control signal.

      3. The main body ECU LH controls the following parts based on the signals listed in B:
        • Headlight (low)
        • Headlight (high)
        • Clearance light
        • Front fog light
      4. The main body ECU RH controls the following parts based on the signals li
        • Taillight
        • License plate light
    6. Stop light system
      1. The rear multiplex network ECU receives the following signals (A):
        • Stop light switch signal
      2. The rear multiplex network ECU sends the following signals to the rear multiplex network ECU based on the signal listed in A (B):
        • Stop light ON demand signal
      3. The rear multiplex network ECU controls the following parts based on the signals listed in B:
        • Stop light
        • High-mounted stop light
    7. Back-up light system
      1. The rear multiplex network ECU receives the following signals (A):
        • Shift position R signal
      2. The rear multiplex network ECU sends the following signals to the rear multiplex network ECU based on the signal listed in A (B):
        • Back-up light ON demand signal
      3. The rear multiplex network ECU controls the following parts based on the signals listed in B:
        • Back-up light
    8. Illuminated entry system
      1. The main body ECU RH receives the following signals (A):
        • Driver side door courtesy light switch signal
        • Front passenger side door courtesy light switch signal
        • Rear door courtesy light switch LH signal
        • Rear door courtesy light switch RH signal
        • Driver side door lock signal
        • Front passenger side door lock signal
        • Rear door lock LH signal
        • Rear door lock RH signal
        • Power switch signal
      2. The main body ECU RH sends the following signals to the overhead junction block based on the signal listed in A (B):
        • Illumination ON demand signal:

          Sent when the respective door courtesy switch signal or door lock signal is received.

      3. The overhead junction block controls the following parts based on the signals listed in B:
        • Front room light
    9. Rear room light
      1. The main body ECU RH receives the following signals (A):
        • Rear door courtesy light switch LH
        • Rear door courtesy light switch RH
      2. The main body ECU RH sends the following signals to the overhead junction block based on the signal listed in A (B):
        • Rear room light LH ON demand signal Sent when the rear door courtesy switch LH signal is received.
        • Rear room light RH ON demand signal Sent when the rear door courtesy switch RH signal is received.
      3. The overhead junction block controls the following parts based on the signals listed in B:
        • Rear seat light LH
        • Rear seat light RH
    10. Foot light system
      1. The main body ECU RH receives the following signals (A):
        • Driver side door courtesy light switch signal
        • Front passenger side door courtesy light switch signal
        • Rear door courtesy light switch LH signal
        • Rear door courtesy light switch RH signal
        • Driver side door lock signal
        • Front passenger side door lock signal
        • Rear door lock LH signal
        • Rear door lock RH signal
        • Shift position P signal
        • Power switch signal
      2. The main body ECU RH sends the following signals to the main body ECU RH based on the signal listed in A (B):
        • Foot light ON demand signal

          Sent when the respective door courtesy SW signal or door lock signal is received or when the shift position P and power switch signals are received.

      3. The main body ECU RH controls the following parts based on the signals listed in B:
        • Front foot light
        • Rear interior illumination light
    11. Door courtesy light lighting system
      1. The main body ECU RH receives the following signals (A):
        • Driver side door courtesy light switch signal
        • Front passenger side door courtesy light switch signal
        • Rear door courtesy light switch LH signal
        • Rear door courtesy light switch RH signal
      2. The main body ECU RH sends the following signals to the each door ECU based on the signal listed in A (B):
        • Courtesy light ON demand signal: Sent when the respective door courtesy switch signal is received.
      3. The each door ECU controls the following parts based on the signals listed in B:
        • Door courtesy light illumination
    12. AFS
      1. The AFS ECU receives the following signals (A):
        • Headlight ON demand signal
        • Daytime running light ON demand signal
        • Generator L terminal signal
        • Shift position signal
        • Zero point value stored in steering angle sensor
        • Steering angle sensor signal
        • Vehicle height sensor signal
        • Vehicle speed signal
        • AFS OFF switch signal
      2. The AFS ECU RH sends the following signals to the AFS ECU based on the signal listed in A (B):
        • Leveling actuator operation demand

          Drives based on the vehicle height sensor signal when the headlight ON demand signal or generator L terminal signal is received and the daytime running light ON demand signal is not received.

        • Swivel motor operation demand

          Drives according to the vehicle speed signal and steering angle sensor signal when the headlight ON demand signal, alternator L terminal signal and zero-point value stored in the steering angle sensor are received and the daytime running light ON demand signal, shift position R and N signals, and AFS OFF switch signal are not received.

        • AFS warning signal

          Sent when an abnormality is detected in the respective signal or system.

        • AFS OFF indicator signal

          Sent when the AFS OFF switch is pushed.

      3. The AFS ECU controls the following parts based on the signals listed in B:
        • Headlight leveling actuator LH
        • Headlight leveling actuator RH
        • Swivel motor LH
        • Swivel motor RH
        • AFS OFF indicator light
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