Lexus ES manuals

Lexus ES: Fail-safe Chart

Lexus ES (XZ10) Service Manual / Steering / Power Assist Systems / Power Steering System(for Gasoline Model) / Fail-safe Chart

FAIL-SAFE CHART

If a problem occurs in the power steering system, the power steering assist will be stopped or the amount of power assist will be decreased to protect the system.

Power Steering System

Malfunction

Fail-safe Operation

EPS warning light

Buzzer
  • Torque sensor (rack and pinion power steering gear assembly) malfunction
  • Power steering motor (rack and pinion power steering gear assembly) malfunction
  • Power steering ECU (rack and pinion power steering gear assembly) malfunction

Power steering assist stops or assist amount is limited

Red or yellow

Sounds intermittently or once
  • Vehicle speed signal malfunction
  • Skid control ECU (brake actuator assembly) malfunction
  • Decrease in battery voltage (not malfunction)

Power steering assist is temporarily limited

Yellow

Sounds once

HINT:

  • If the power steering assist stops, the EPS warning light comes on (red).
  • If the amount of power assist is reduced, the EPS warning light comes on (yellow) and a vibration or sound may occur.
  • The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the engine running.
  • If the battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS warning light will come on. In such cases, the amount of power assist returns to normal when the battery voltage recovers.

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