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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. FRONT POWER SEAT SWITCH (MEMORY SEAT ECU AND SWITCH) 
    Fig 1: Identifying Front Power Seat Switch ECM Connector
    G04337622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P27 and P28 connectors.
    2. Check the voltage or resistance of each terminal of the wire harness side connectors.

      Standard: 

      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (P28-4) - GND (P27-1) O - W-B Ignition switch Ignition switch OFF --> ON Below 1 V --> 10 to 14 V
      SYSB (P28-8) - GND (P27-1) W - W-B Power source Always 10 to 14 V
      GND (P27-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      +B (P27-5) - GND (P27-1) 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. Reconnect the P27 and P28 ECU connectors.
    4. Check the voltage of each terminal of the connectors.

      Standard: 

      CONNECTOR TERMINAL VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SI (P28-1) - GND (P27-1) G-Y - W-B Communication signal Memory switch ON and ignition switch ON Pulse generation
      SW1 (P28-2) - GND (P27-1) P - W-B Seat memory switch signal (Switch 1) Seat memory switch 1 is free --> pushed 10 to 14 V --> Below 1 V
      DCTY (P28-3) - GND (P27-1) Y - W-B Driver side door courtesy lamp switch signal Driver side door is open --> closed Below 1 V --> 10 to 14 V
      MMRY (P28-5) - GND (P27-1) LG - W-B Seat memory switch signal (Set) Seat memory switch SET is free --> pushed 10 to 14 V --> Below 1 V
      SW2 (P28-6) - GND (P27-1) V - W-B Seat memory switch signal (Switch 2) Seat memory switch 2 is free --> pushed 10 to 14 V --> Below 1 V
      P (P28-7) - GND (P27-1) GR - W-B Park/neutral position switch signal Ignition switch ON and shift lever P position --> other than P position 10 to 14 V --> Below 1 V
      SLD+ (P27-2) - GND (P27-1) L - W-B Sliding motor signal (Forward) Seat moving forward using sliding switch --> Others 10 to 14 V --> Below 1 V
      SLD- (P27-3) - GND (P27-1) Y - W-B Sliding motor signal (Rearward) Seat moving rearward using sliding switch --> Others 10 to 14 V --> Below 1 V
      FRV- (P27-4) - GND (P27-1) G - W-B Front vertical motor signal (Downward) Seat cushion front portion lowering using front vertical switch --> Others 10 to 14 V --> Below 1 V
      FRV+ (P27-6) - GND (P27-1) B - W-B Front vertical motor signal (Upward) Seat cushion front portion raising using front vertical switch --> Others 10 to 14 V --> Below 1 V
      LFT+ (P27-7) - GND (P27-1) V - W-B Lifter motor signal (Upward) Seat raising using lifter switch --> Others 10 to 14 V --> Below 1 V
      RCL+ (P27-8) - GND (P27-1) P - W-B Reclining motor signal (Forward) Seatback moving forward using reclining switch --> Others 10 to 14 V --> Below 1 V
      LFT- (P27-9) - GND (P27-1) W - W-B Lifter motor signal (Downward) Seat lowering using lifter switch --> Others 10 to 14 V --> Below 1 V
      RCL- (P27-10) - GND (P27-1) BR - W-B Reclining motor signal (Rearward) Seatback moving rearward using reclining switch --> Others 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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