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Terminals Of Ecu

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY ECU) 
    Fig 1: Identifying Instrument Panel Junction Block Assembly Connector Terminals (Front Side)
    G05267203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Identifying Instrument Panel Junction Block Assembly Connector Terminals (Back Side)
    G05267204Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the IB, IE and IH J/B connectors.
    2. Disconnect the B3 and B5 ECU connectors.
    3. Check the voltage and resistance of each terminal of the wire harness side connectors.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    BECU (IB-4) - Body ground W-R - Body ground Always 10 to 14 V
    BDR1 (IE-9) - Body ground G-W - Body ground
    GND1 (IH-2) - Body ground W-B - Body ground Always Below 1 Ω
    GND2 (IH-2) - Body ground W-B - Body ground Always Below 1 Ω
    MPX1 (B3-24) - Body ground B - Body ground Always 10 kΩ or higher
    MPX2 (B3-23) - Body ground B - Body ground Always 10 kΩ or higher
    MPX3 (B5-26) - Body ground B - Body ground Always 10 kΩ or higher

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

  2. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DRIVER DOOR ECU) 
    Fig 3: Identifying D18 Switch Connector Terminals
    G05267205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D18 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    E (D18-2) - Body ground W-B - Body ground Always Below 1 Ω
    CPUB (D18-9) - E (D18-2) L - W-B Always 10 to 14 V
    BDR1 (D18-10) - E (D18-2) B-W - W-B Always 10 to 14 V
    MPX1 (D18-7) - Body ground B - Body ground Always 10 kΩ or higher
    MPX2 (D18-8) - Body ground L - Body ground Always 10 kΩ or higher

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

  3. CHECK MULTIPLEX TILT AND TELESCOPIC ECU (TILT AND TELESCOPIC ECU) 
    Fig 4: Identifying T6 ECU Connector Terminals
    G05267206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T6 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    GND (T6-11) - Body ground W-B - Body ground Always Below 1 Ω
    +B (T6-2) - GND (T6-11) G-B - W-B Always 10 to 14 V
    ECUB (T6-9) - GND (T6-11) W-R - W-B Always 10 to 14 V
    MPX1 (T6-5) - Body ground W - Body ground Always 10 kΩ or higher
    MPX2 (T6-14) - Body ground B - Body ground Always 10 kΩ or higher

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

  4. CHECK MULTIPLEX NETWORK BODY ECU NO. 2 (BODY NO. 2 ECU) 
    Fig 5: Identifying S27 & S28 ECU Connector Terminals
    G05267207Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the S27 and S28 ECU connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    GND (S27-25) - Body ground W-B - Body ground Always Below 1 Ω
    SG (S27-24) - GND (S27-25) W-B - W-B Always Below 1 Ω
    SIG (S27-3) - GND (S27-25) B-R - W-B Always Below 1 Ω
    BECU (S27-4) - GND (S27-25) W-R - W-B Always 10 to 14 V
    MPX+ (S28-2) - Body ground L - Body ground Always 10 kΩ or higher
    MPX- (S28-6) - Body ground B - Body ground Always 10 kΩ or higher

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

  5. CHECK WINDSHIELD WIPER ECU (WIPER ECU) 
    Fig 6: Identifying W4 & W5 ECU Connector Terminals
    G05267208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the W4 and W5 ECU connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connectors.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    GND (W4-12) - Body ground W-B - Body ground Always Below 1 Ω
    WIG (W5-10) - Body ground L - Body ground Always Below 1 Ω
    +B (W4-8) - GND (W4-12) W-R - W-B Always 10 to 14 V
    MPX1 (W4-1) - Body ground R-Y - Body ground Always 10 kΩ or higher
    MPX2 (W4-2) - Body ground B - Body ground Always 10 kΩ or higher

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

  6. CHECK THEFT DETERRENT ECU 
    Fig 7: Identifying T5 ECU Connector Terminals
    G05267209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the T5 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    E (T5-29) - Body ground W-B Body ground Always Below 1 Ω
    +B1 (T5-2) - E (T5-29) W-R - W-B Always 10 to 14 V
    +B2 (T5-3) - E (T5-29) P - W-B Always 10 to 14 V
    MPX1 (T5-31) - Body ground B - Body ground Always 10 kΩ or higher

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

  7. CHECK POWER SEAT ECU 
    Fig 8: Identifying P19 & P20 ECU Connector Terminals
    G05267210Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P19 and P20 ECU connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connectors.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    GND (P19-1) - Body ground W-B - Body ground Always Below 1 Ω
    +B (P19-5) - GND (P19-1) LG - W-B Always 10 to 14 V
    SYSB (P20-8) - GND (P19-1) GR - W-B Always 10 to 14 V
    MPX1 (P20-1) - Body ground W - Body ground Always 10 kΩ or higher

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

  8. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (MIRROR ECU) 
    Fig 9: Identifying R10 ECU Connector Terminals
    G05267211Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R10 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    GND (R10-14) - Body ground W-B - Body ground Always Below 1 Ω
    +B (R10-1) - GND (R10-14) W-R - W-B Always 10 to 14 V
    MPX1 (R10-13) - Body ground W - Body ground Always 10 kΩ or higher
    MPX2 (R10-25) - Body ground B - Body ground Always 10 kΩ or higher

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

  9. CHECK RAIN SENSOR 
    Fig 10: Identifying R13 ECU Connector Terminals
    G05267212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R13 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    ES (R13-3) - Body ground W-B - Body ground Always Below 1 Ω
    SIG (R13-1) - ES (R13-3) B-W - W-B Always 10 to 14 V
    MPX (R13-12) - Body ground R-Y Body ground Always 10 kΩ or higher

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

  10. CHECK MAYDAY ECU 
    Fig 11: Identifying M15 ECU Connector Terminals
    G05267213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M15 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.
    VOLTAGE AND RESISTANCE SPECIFICATION

    Symbols (Terminal No.) Wiring Color Condition Specified Condition
    +B (M15-1) - Body ground G - Body ground Always 10 to 14 V
    E (M15-12) - Body ground W-B - Body ground Always Below 1 Ω
    MPX1 (M15-23) - Body ground P-L - Body ground Always 10 kΩ or higher

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

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