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HOMESERVICE MANUALSTOYOTA2009YARIS BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLBRAKE CONTROLANTI-LOCK BRAKE SYSTEM (FOR HATCHBACK)TERMINALS OF ECU
2009 Toyota Yaris Base, 4D Sedan, Automatic

Terminals Of Ecu

2009 Toyota Yaris Base, 4D Sedan, AutomaticSECTION Terminals Of Ecu
  1. TERMINALS OF ECU 
    Fig 1: Identifying ECU Connector Terminals
    G05401072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION

    Terminal No. (Symbol) Terminal Description
    1 (GND1) Skid control ECU ground
    4 (RL-) Rear wheel speed LH (-) signal input
    5 (RL+) Rear wheel speed LH (+) power supply output
    6 (FR-) Front wheel speed RH (-) signal input
    7 (FR+) Front wheel speed RH (+) power supply output
    12 (+BS) Solenoid relay power supply
    13 (GND2) Pump motor ground
    14 (CANL) CAN communication line L
    16 (RR-) Rear wheel speed RH (-) signal input
    17 (RR+) Rear wheel speed RH (+) power supply output
    18 (FL-) Front wheel speed LH (-) signal input
    19 (FL+) Front wheel speed LH (+) power supply output
    24 (+BM) Motor relay power supply
    25 (CANH) CAN communication line H
    28 (STP) Stop light switch input
    34 (IG1) ECU power supply
  2. TERMINAL INSPECTION 
    1. Disconnect the connector and measure the voltage or resistance on the wire harness side.
      Fig 2: Identifying A15 Skid Control ECU Connector Terminals
      G06131984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.

      Standard 

      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A15-1 (GND1) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω
      A15-12 (+BS) - Body ground W - Body ground Solenoid relay power supply Always 11 to 14 V
      A15-13 (GND2) - Body ground W-B - Body ground Pump motor ground Always Below 1 Ω
      A15-28 (STP) - Body ground G - Body ground Stop light switch input Stop light switch ON → OFF
      (Brake pedal depressed → released)      		 8 to 14 V
      → Below 1.5 V
      A15-24 (+BM) - Body ground B - Body ground Motor relay power supply Always 11 to 14 V
      A15-25 (CANH) - A15-14 (CANL) G - W CAN BUS Ignition switch off 54 to 69 Ω
      A15-34 (IG1) - Body ground B - Body ground ECU power supply Ignition switch ON 11 to 14 V
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.