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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [12/2019 - ] >> Description

DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [12/2019 - ]: Description

The brake pedal load sensing switch (brake pedal support assembly) signal turns on when the brake pedal is depressed with a force exceeding a predetermined level.

The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not.

DTC No. Detection Item DTC Detection Condition Trouble Area
C0040-9E Brake Pedal Switch "A" Stuck On Either of the following is detected:
  • When the +BS terminal voltage is 9.5 V or higher with the stop light switch signal off, the brake pedal load sensing switch (brake pedal support assembly) signal on, the master cylinder pressure below 0.7 MPa (71.1 kgf/cm2 , 101 psi), and the engine speed 500 rpm or higher, the deceleration is below 0.08 G for 10 seconds or more.
  • When the +BS terminal voltage is 9.5 V or higher, the condition that the brake pedal load sensing switch (brake pedal support assembly) signal remains on while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (19 mph) occurs 5 times in succession.
  • Brake pedal load sensing switch (brake pedal support assembly)
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)
C0040-9F Brake Pedal Switch "A" Stuck Off Either of the following is detected:
  • When the +BS terminal voltage is from 9.5 to 17.4 V with the stop light switch signal on, the brake pedal load sensing switch (brake pedal support assembly) signal off, and the master cylinder pressure 6 MPa (61.2 kgf/cm2 , 870 psi) or more, the deceleration is 0.4 G or more for 1 second or more.
  • When the +BS terminal voltage is from 9.5 to 17.4 V with the stop light switch signal on, the brake pedal load sensing switch (brake pedal support assembly) signal off, and the master cylinder pressure exceeding 6 MPa (61.2 kgf/cm2 , 870 psi), the vehicle speed is 0 km/h (0 mph) for 5 seconds or more.
  • Brake pedal load sensing switch (brake pedal support assembly)
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)
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