Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE OPERATION

  • If there is a problem with sensor signals or actuator systems, the skid control ECU prohibits power supply to the brake actuator assembly and informs the ECM of a VSC system malfunction.

    The brake actuator assembly turns off the solenoids and the ECM stops its VSC control according to signals from the skid control ECU. The vehicle will operate in a manner similar to a vehicle that is not equipped with ABS, TRAC, VSC and brake hold systems.

    ABS control will be prohibited, but EBD control will continue to the extent that EBD control is possible. If EBD control is impossible, the brake system warning light will come on to warn the driver.

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  • If a VSC system component malfunctions before VSC control begins, VSC control will be prohibited. If a system component malfunctions during VSC control, the system will gradually stop performing control so as not to trigger a sudden change in vehicle operation.

    If it is impossible for control to continue, the warning light comes on to inform the driver of system control termination.

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  • When a malfunction occurs in the VSC system or electric parking brake system, brake hold control prohibits brake hold operation to prevent incorrect operation and protect the system.

    HINT:

    When control is prohibited, the brake hold operated indicator light blinks, and the code for the system where the malfunction occurred during diagnostic mode is displayed by the brake hold standby indicator light.

  • If the skid control ECU (brake actuator assembly) detects a malfunction in the SRS system, secondary collision brake control is prohibited to prevent undesired operation and to protect the system.

    HINT:

    When control is prohibited, a message is displayed on the multi-information display in the combination meter assembly.

ABS, EBD and BA Systems

Malfunction Area

Control Method

ABS system

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited.

BA system

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited.

EBD system

ABS, EBD, BA, TRAC and VSC control prohibited.

Brake hold control prohibited.

TRAC and VSC Systems

Malfunction Area

Control Method

Engine control system

(TRAC system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

Brake control system

(VSC system)

Before control: Disables control.

During control: Uses only the engine to perform control.

Brake control system

(TRAC system)

Before control: Disables control.

During control: Disables control (by gradually ending control).

Secondary Collision Brake System

Malfunction Area

Control Method

Airbag system

(Secondary collision brake system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

Engine control system

(Secondary collision brake system)

Before control: Disables control.

During control: Uses only the brakes to perform control.

    Freeze Frame Data
    FREEZE FRAME DATA FREEZE FRAME DATA (a) Using the Techstream, check the vehicle condition (ECU, sensor) when the brake system operates or a DTC is output. CHECK FREEZE FRAME DATA WHEN DTC WAS STORED ...

    Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a pa ...

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

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

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