Fail-Safe Chart

• When trouble occurs in the brake control system, the skid control ECU turns the warning lights on, displays a DTC corresponding to the malfunctioning systems on the multi-information display, and prohibits ABS, BA, TR(A)C and VSC operations.
• The skid control ECU prevents operation of a malfunctioning hydraulic pressure system and continues brake control with the normal hydraulic pressure system.

HINT:

• If control of the electronically controlled brake system for any of the 4 wheels is prohibited, that wheel loses brake booster function or braking ability.
• If one of the 4 wheels loses brake booster function, the feeling when depressing the brake pedal changes as the stroke simulator (pedal reactive force generating solenoid) operation will be prohibited.
• If control of the electronically controlled brake system for all wheels is prohibited, the 2 front wheels will lose brake booster function.

  ABS, EBP and BA system: 

  FAIL-SAFE CHART - ABS, EBP AND BA SYSTEM
  
  

  Malfunction Area	Control Method
  ABS system	ABS, BA, TR(A)C and VSC control prohibited
  BA system	ABS, BA, TR(A)C and VSC control prohibited
  EBD system	ABS, EBD, BA, TR(A)C and VSC control prohibited

  TR(A)C and VSC system: 

  FAIL-SAFE CHART - TR(A)C AND VSC SYSTEM
  
  

  Malfunction Area	Control Method
  Engine control system (TR(A)C and VSC systems)	Before control: Disables control During control: Uses only the brakes to effect control
  Brake control system (TR(A)C and VSC systems)	Before control: Disables control During control: Disables control (by gradually ending control)

  HINT:

  As for the TR(A)C and VSC systems, different systems prohibit different controls depending on a malfunctioning part.