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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Except HV) - Diagnostics - Introduction (1 Of 2) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> Terminals Of Ecu [12/2019 - ] >> Terminals Of Ecu [12/2019 - ]

Terminals Of Ecu [12/2019 - ]

  1. TERMINAL INSPECTION 
    1. Disconnect the A39 connector and measure the voltage or resistance on the wire harness side.
      GTY920182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))      		 - -

      HINT: 

      Voltage cannot be measured with the connector connected to the skid control (brake actuator assembly) as the connector is watertight.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      A39-1 (GND1) - Body ground Skid control ECU (brake actuator assembly) ground 1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal Below 1 Ω
      A39-2 - - -
      A39-3 - - -
      A39-4 (RL-) Rear wheel speed LH (-) signal input - -
      A39-5 (RL+) Rear wheel speed LH (+) power supply output - -
      A39-6 (FR-) Front wheel speed RH (-) signal input - -
      A39-7 (FR+) Front wheel speed RH (+) power supply output - -
      A39-8 - - -
      A39-9 (CSW) - Body ground VSC OFF switch input VSC OFF switch is pushed → released Below 1 Ω → 10 kΩ or higher
      A39-10 - - -
      A39-11 (STP) - Body ground Stop light switch assembly input Stop light switch assembly on → off
      (brake pedal depressed → released)      		 8 to 14 V → Below 1.5 V
      A39-12 - - -
      A39-13 - - -
      A39-14 (+BS) - Body ground Solenoid relay power supply Always 11 to 14 V
      A39-15 - - -
      A39-16 - - -
      A39-17 - - -
      A39-18 (SP1) - Body ground Speed signal output for speedometer Ignition switch ON 11 to 14 V
      A39-19 (RR-) Rear wheel speed RH (-) signal input - -
      A39-20 (RR+) Rear wheel speed RH (+) power supply output - -
      A39-21 (FL-) Front wheel speed LH (-) signal input - -
      A39-22 (FL+) Front wheel speed LH (+) power supply output - -
      A39-23 - - -
      A39-24 - - -
      A39-25 - - -
      A39-26 - - -
      A39-27 (CANH) CAN communication line H - -
      A39-28 (FSW+) - Body ground Brake pedal load sensing switch (brake pedal support assembly) input Brake pedal depressed → released 950 to 1050 Ω → 203 to 223 Ω
      A39-29 - - -
      A39-30 (GND2) - Body ground Pump motor ground 1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal Below 1 Ω
      A39-31 - - -
      A39-32 (STPO) - Body ground Stop light control relay (stop light switch assembly) output Ignition switch ON 11 to 14 V
      A39-33 - - -
      A39-34 - - -
      A39-35 (PKB) - Body ground Brake hold switch (electric parking brake switch assembly) input Brake hold switch (electric parking brake switch assembly) is pushed → released Below 1 Ω → 10 kΩ or higher
      A39-36 - - -
      A39-37 (STP2) - Body ground Stop light signal input Brake pedal depressed → released 8 to 14 V → Below 1.5 V
      A39-38 - - -
      A39-39 - - -
      A39-40 - - -
      A39-41 - - -
      A39-42 - - -
      A39-43 (CANL) CAN communication line L - -
      A39-44 (HDCS) - Body ground*3 Downhill assist control switch input Downhill assist control switch is pushed → released Below 1 Ω → 10 kΩ or higher
      A39-45 (IG1) - Body ground ECU power supply input Ignition switch ON 10.5 to 16 V*1
      11 to 14 V*2
      A39-46 (BM) - Body ground Motor relay power supply Always 11 to 14 V

      *1: w/ Stop and Start System

      *2: w/o Stop and Start System

      *3: for AWD

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