2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

  1. CHECK ECM (2GR-FSE) 
    Fig 1: Identifying Terminals Of ECU
    G05300247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of each terminal of the connectors.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +BM (E8-5) - E1 (E7-7) P - BR Power supply Engine switch on (IG) 10 to 14 V
      BATT (A6-4) - E1 (E7-7) L - BR Power supply Always 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch on (IG) Below 1 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch off 10 to 14 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG) Rear defogger switch ON Below 1 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG) Rear defogger switch OFF 10 to 14 V
      ME01 (E8-4) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω.
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, the ECM may have a malfunction.

  2. CHECK ECM (3UZ-FE) 
    Fig 2: Identifying ECM (3UZ-FE) Connector
    G05285432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of each terminal of the connectors.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +BM (E8-5) - E1 (E7-7) P - BR Power supply Engine switch on (IG) 10 to 14 V
      BATT (A6-4) - E1 (E7-7) L - BR Power supply Always 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch on (IG) Below 1 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch off 10 to 14 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG) Rear defogger switch ON Below 1 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG) Rear defogger switch OFF 10 to 14 V
      ME01 (E8-4) - Body ground BR - Body ground Ground Always Below 1 Ω
      E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, the ECM may have a malfunction.

  3. CHECK A/C AMPLIFIER ASSEMBLY (A/C ECU) 
    Fig 3: Identifying A/C Amplifier Assembly (A/C ECU) Connector
    G05300249Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K52 amplifier connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (K52-21) - GND (K52-20) W - W-B Ignition power supply Engine switch on (IG) 10 to 14 V
      IG+ (K52-21) - GND (K52-20) W - W-B Ignition power supply Engine switch off Below 1 V
      B (K52-1) - GND (K52-20) L - W-B Battery power supply Always 10 to 14 V
      GND (K52-20) - 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. CHECK MULTI-DISPLAY 
    Fig 4: Identifying Multi-Display Connector
    G05300250Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K46 multi-display connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (K46-3) - GND1 (K46-10) B - W-B Ignition power supply Engine switch on (IG) 10 to 14 V
      IG (K46-3) - GND1 (K46-10) B - W-B Ignition power supply Engine switch off Below 1 V
      +B (K46-1) - GND1 (K46-10) O - W-B Battery power supply Always 10 to 14 V
      GND1 (K46-10) - 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.

  5. CHECK IGNITION CONTROL ECU ASSEMBLY 
    Fig 5: Identifying Ignition Control ECU Assembly Connector
    G05300251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K73 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AM1 (K73-33) - Body ground O - Body ground +B power supply Always 10 to 14 V
      GND2 (K73-6) - 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.

    3. Reconnect the K73 ECU connector.
    4. Measure the voltage of the connector.
      TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch on (ACC) Below 1 V
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch off 10 to 14 V

      If the result is not as specified, the ECU may have a malfunction.

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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.

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