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Last Modified: 11-27-2007 1.6 U
Service Category: Vehicle Exterior Section: Lighting (ext)
Model Year: 2008 Model: LX570 Doc ID: RM000002R6E005X
Title: LIGHTING (EXT): LIGHTING SYSTEM: FAIL-SAFE CHART (2008 LX570)

FAIL-SAFE CHART

1. AFS ECU

If the AFS 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.

Trouble Area

Leveling Fail-safe Control

Swivel Fail-safe Control

AFS OFF Indicator Light

Headlight Swivel Motor Malfunction

Continues to control with both headlight leveling motors lower than the current position by 0.7°.

Stops the malfunctioning swivel motor at the current position.

Flash

Steering Angle Sensor Signal Malfunction

Continues to control.

Returns both headlight swivel motors back to the front.

Speed Sensor Signal Malfunction

Continues to control.

After 5 seconds, returns both headlight swivel motors back to the front.

Height Control Sensor Signal Malfunction
  • Stops operation after returning to the initial position (Fail at higher than the initial position).
  • Stops operation at the current position (Fail at lower than the initial position).

Returns both headlight swivel motors back to the front.

Headlight Leveling Motor Malfunction

Normal side headlight leveling motor

  • Stops operation after returning to the initial position (Fail at higher than the initial position).
  • Stops at the current position (Fail at lower than the initial position).

Returns both headlight swivel motors back to the front.

Abnormal side headlight leveling motor

  • Stops at the current position.

Communication Signal Malfunction

Skid control ECU:

  • Judges that the vehicle speed is 0 km/h (0 mph) and continues control.

Returns both headlight swivel motors back to the front.

Steering angle sensor:

  • Continues to control.