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Terminals Of Ecu

  1. POSITION CONTROL ECU & SWITCH ASSY (POWER SEAT CONTROL ECU) 
    Fig 1: Position Control ECU & Switch Terminals
    G02975744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the Q14 and Q15 connectors.
    2. Check the voltage of each terminal of the wire harness side connectors.

      Standard: 

      SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (Q14-4) - Q15-1 (GND) Y - W-B Ignition switch Ignition switch off --> on (IG) Below 1 V --> 10 to 14 V
      SYSB (Q14-8) - Q15-1 (GND) GR - W-B Power source Always 10 to 14 V
      +B (Q15-5) - Q15-1 (GND) LG - W-B Battery Always 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Check the resistance of each terminal of the wire harness side connectors.

      Standard: 

      SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (Q15-1) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    4. Reconnect the Q14 and Q15 ECU connectors.
    5. Check the voltage of each terminal of the connectors.

      Standard: 

      SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      MPX1 (Q14-1) - GND (Q15-1) O - W-B Multiplex communication signal circuit Ignition switch on (IG) Pulse generation
      SLD+ (Q15-2) - GND (Q15-1) L - W-B Sliding motor signal (Forward) Seat moving forward using sliding switch --> Other conditions 10 to 14 V --> Below 1 V
      SLD- (Q15-3) - GND (Q15-1) Y - W-B Sliding motor signal (Rearward) Seat moving rearward using sliding switch --> Other conditions 10 to 14 V --> Below 1 V
      FRV- (Q15-4) - GND (Q15-1) B - W-B Front vertical motor signal (Downward) Seat cushion front portion lowering using front vertical switch --> Other conditions 10 to 14 V --> Below 1 V
      FRV+ (Q15-6) - GND (Q15-1) G - W-B Front vertical motor signal (Upward) Seat cushion front portion rising using front vertical switch --> Other conditions 10 to 14 V --> Below 1 V
      LFT+ (Q15-7) - GND (Q15-1) W - W-B Lifter motor signal (Upward) Seat rising using lifter switch --> Other conditions 10 to 14 V --> Below 1 V
      RCL+ (Q15-8) - GND (Q15-1) P - W-B Reclining motor signal (Forward) Seatback moving forward using reclining switch --> Other conditions 10 to 14 V --> Below 1 V
      LFT- (Q15-9) - GND (Q15-1) V - W-B Lifter motor signal (Downward) Seat lowering using lifter switch --> Other conditions 10 to 14 V --> Below 1 V
      RCL- (Q15-10) - GND (Q15-1) BR - W-B Reclining motor signal (Rearward) Seatback moving rearward using reclining switch --> Other conditions 10 to 14 V --> Below 1 V

      If the result is not as specified, the front power seat switch may be malfunctioning.

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