Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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 (electric power steering column sub-assembly) malfunction
  • Power steering motor (power steering ECU assembly) malfunction
  • Power steering ECU 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

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 being 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 when the steering wheel is not turned for approximately 10 minutes with the engine idling.
  • 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.
    EPS Warning Light Circuit
    DESCRIPTION If the power steering ECU assembly detects a malfunction, the power steering ECU assembly stores a DTC and illuminates the EPS warning light. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTIC ...

    Freeze Frame Data
    FREEZE FRAME DATA FREEZE FRAME DATA NOTICE: It is difficult to show the specified values (judgment values) clearly because freeze frame data values change significantly due to differences in measur ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Window Control System: Key-off Operation Function Operates even if Operating Conditions are not Satisfied
    DESCRIPTION When the front doors are closed, each power window regulator motor assembly can be operated for approximately 45 seconds after the engine switch is turned from on (IG) to off by receiving operation permission signals from the main body ECU (multiplex network body ECU). However, when appr ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Air Conditioning System: Pressure Sensor Circuit (B1423/23)
    DESCRIPTION This DTC is stored if refrigerant pressure on the high pressure side is extremely low (196 kPa (2.0 kgf/cm2, 28 psi) or less) or extremely high (2812 kPa (28.7 kgf/cm2, 408 psi) or more). The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect ref ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0135