Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE CHART

(a) When a malfunction is detected in the electronically controlled brake system, the skid control ECU turns the ABS warning light, brake system warning light (red indicator), brake system warning light (yellow indicator) and slip indicator light on, flashes the brake hold operated indicator light*, as well as prohibits ABS, BA, TRAC, VSC, secondary collision brake and brake hold operation.

  • *: The brake hold switch (electric parking brake switch assembly) is turned on under the following vehicle conditions.

    Vehicle Conditions:

    1. The driver door is closed.
    2. The driver seat belt is fastened.

HINT:

When a component of the electronically controlled brake system is in fail-safe mode, operation is prohibited. However, if the system enters fail-safe mode while braking is being controlled, control is gradually suspended to prevent sudden changes in vehicle behavior.

(b) If the skid control ECU detects that a system related to the hybrid control system is malfunctioning, it will prohibit operation of the TRAC and VSC systems in order to prevent further malfunctions and to protect the systems.

HINT:

When control is prohibited, the warning light illuminates, and a DTC will be output by the system that is malfunctioning.

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(c) If a malfunction in the electronically controlled brake system, electric parking brake system or hybrid control system is detected, control by the brake hold function is prohibited to prevent undesired operation and to protect the system.

HINT:

When control by the brake hold system is prohibited, the brake hold switch (electric parking brake switch assembly) is on and the following conditions are met, the brake hold operated indicator light will blink.

  • Vehicle conditions:
    • The driver door is closed.
    • The driver seat belt is fastened.

(d) If the skid control ECU detects that a system related to the airbag system is malfunctioning, it will prohibit operation of the secondary collision brake in order to prevent further malfunctions and to protect the systems.

HINT:

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

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ABS, EBD and BA System

Item

Operation

Malfunction in the ABS.

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited.

Malfunction in the BA system.

ABS, BA, TRAC and VSC control prohibited.

Brake hold control prohibited.

Malfunction in the EBD system.

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

Brake hold control prohibited.

TRAC and VSC System

Item

Operation

Malfunction in the engine control system (TRAC and VSC systems).

Before control: Disables control.

During control: Uses only the brakes to perform control.

Malfunction in the brake control system (VSC system).

Before control: Disables control.

During control: Uses only the engine to perform control.

Malfunction in the brake control system (TRAC system).

Before control: Disables control.

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

Secondary Collision Brake System

Item

Operation

Malfunction in the airbag system (secondary collision brake system).

Before control: Disables control.

During control: Uses only the brakes to perform control.

Malfunction in the engine control system (secondary collision brake system).

Before control: Disables control.

During control: Uses only the brakes to perform control.

FAIL-SAFE FUNCTION OF HYDRAULIC SYSTEM

(a) For the electric brake booster (brake booster with master cylinder assembly) and skid control ECU (brake actuator assembly), if the power supply is interrupted, a brake fluid control component malfunctions or the brake fluid pressure supply stops, the system performs the following fail-safe operations:

Item

Operation

A function controlled by electric brake booster (brake booster with master cylinder assembly) stops working.

Skid control ECU (brake actuator assembly) generates braking force.

A function controlled by skid control ECU (brake actuator assembly) stops working.

Electric brake booster (brake booster with master cylinder assembly) generates braking force.

Power supply to electric brake booster (brake booster with master cylinder assembly) and skid control ECU (brake actuator assembly) stops.

Electric brake booster (brake booster with master cylinder assembly) generates braking force.

Power supply to the electric brake booster (brake booster with master cylinder assembly) and skid control ECU (brake actuator assembly) stops and the brake control power supply assembly stops supplying power.

Braking force solely generated by the driver.

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