Lighting System Fail-Safe Chart

  1. Automatic Light Control System

  1. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Lighting System -- Fail-Safe Chart



Automatic Light Control System
If the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control sensor, the main body ECU (multiplex network body ECU) performs fail-safe control to prohibit the automatic light control. If the low beam headlights and taillights are on, the lights will remain on until the headlight dimmer switch is turned off.

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM
If the headlight swivel ECU detects a malfunction in the automatic headlight beam level control system or intelligent AFS, it will take the actions indicated in the table below.

Malfunctioning Part
Detection Condition
Leveling Fail-safe Control
Warning Light
Speed Sensor
Speed sensor signal malfunction
Continues control.
Flashes
Rear Height Control Sensor*1
Rear height control sensor signal malfunction
  1. Stops operation after returning the headlight motor to the initial position (system fails when the headlight motor is higher than the initial position).
  2. Stops operation with the headlight motor at the current position (system fails when the headlight motor is lower than the initial position).
Flashes
Source voltage malfunction
Suspension control ECU*2
Height control signal malfunction
  1. Stops operation after returning the headlight motor to the initial position (system fails when the headlight motor is higher than the initial position).
  2. Stops operation with the headlight motor at the current position (system fails when the headlight motor is lower than the initial position).
Flashes
Source voltage malfunction
Headlight Leveling Motor
Headlight leveling motor communication error
Normal headlight leveling motor:
  1. Stops operation after returning the headlight motor to the initial position (system fails when the headlight motor is higher than the initial position).
  2. Stops operation with the headlight motor at the current position (system fails when the headlight motor is lower than the initial position).
Flashes
Headlight leveling motor malfunction
  1. Open in circuit
  2. Short in circuit
  3. Overheated
Normal headlight leveling motor:
  1. Stops operation after returning the headlight motor to the initial position (system fails when the headlight motor is higher than the initial position).
  2. Stops operation with the headlight motor at the current position (system fails when the headlight motor is lower than the initial position).
Flashes
Voltage malfunction
Abnormal headlight leveling motor:
  1. Stops operation with the headlight motor at the current position.
Off
CAN Communication System
Communication signal malfunction
(Main body ECU)
Continues control.
Flashes
Communication signal malfunction
(Skid control ECU)
Judges that the vehicle speed is 0 km/h (0 mph) and continues control.
Headlight Swivel ECU
Vehicle specifications unconfirmed
Continues control
Flashes
Rear height control sensor initialization unconfirmed
Both headlight leveling motors:
  1. Stops operation with both motors at the same position as when the vehicle is empty.
Blinks 6 times after ignition switch is turned from off to ON
  1. *1: w/o Air Suspension System
  2. *2: w/ Air Suspension System