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Terminals Of Ecu

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK NETWORK GATEWAY ECU 
    Fig 1: Identifying Network Gateway ECU Connector Terminals
    G04022299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K66 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE REFERENCE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (K66-10) - GND (K66 24) G - W-B +B (BATT) power supply Always 10 to 14 V
      IG (K66-1) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V
      ACC (K66-2) - Body ground V - Body ground ACC power supply Engine switch on (ACC) 10 to 14 V
      SIL (K66-7) - Body ground O - Body ground Bus "+" line During transmission Pulse generation
      MPI1 (K66-4) - Body ground LG - Body ground MPX line Always 10 kΩ or higher
      MPI2 (K66-13) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPL1 (K66-5) - Body ground W - Body ground MPX line Always 10 kΩ or higher
      MPL2 (K66-14) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPD1 (K66-3) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPD2 (K66-12) - Body ground SB - Body ground MPX line Always 10 kΩ or higher
      GND (K66-24) - 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.

  2. CHECK ENGINE ROOM NO. 2 RELAY BLOCK (FRONT CONTROLLER) 
    Fig 2: Identifying Engine Room No. 2 Relay Block Connector Terminals
    G04022300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2E and 2F junction block connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE REFERENCE CHART

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      FMB3 (2E-4) - E (2F-1) G-R - W-B +B (FMB3) power supply Always 10 to 14 V
      MPX1 (2F-5) - E (2F-1) GR - W-B MPX line Always 10 kΩ or higher
      MPX2 (2F-6) - E (2F-1) GR-L - W-B MPX line Always 10 kΩ or higher
      E (2F-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.

  3. CHECK COWL SIDE JUNCTION BLOCK LH (COWL SIDE JUNCTION BLOCK ECU LH) 
    Fig 3: Identifying Cowl Side Junction Block Connector Terminals - LH
    G04022301Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the PA, PD and PL junction block connectors.
    2. Disconnect the D3 and D5 ECU connectors.
    3. Measure the resistance and voltage of the wire harness side connectors.
      VOLTAGE AND RESISTANCE REFERENCE CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      MPX-B (PL-1) - GND (PA-14) G-R - W-B +B (MPX-B) power supply Always 10 to 14 V
      MPX1 (V3-15) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (A39-6) - Body ground GR-L - Body ground MPX line Always 10 kΩ or higher
      GND (PA-14) - Body ground W-B - Body ground Ground Always Below 1 Ω
      SGND (PD-8) - 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 COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU) 
    Fig 4: Identifying Cowl Side Junction Block Connector Terminals - RH
    G04022302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DA, DD and DK junction block connectors.
    2. Disconnect the K68 ECU connector.
    3. Measure the resistance and voltage of the wire harness side connectors.
      TERMINAL NUMBER AND SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (DK-5) - GND2 (DD-7) G-R - W-B +B (MPX-B) power supply Always 10 to 14 V
      MPX1 (DA-26) - GND2 (DD-7) GR - W-B MPX line Always 10 kΩ or higher
      MPX2 (K68-21) - GND2 (DD-7) O - W-B MPX line Always 10 kΩ or higher
      GSW (DA-7) - GND2 (DD-7) B - W-B MPX line Always 10 kΩ or higher
      GND2 (DD-7) - 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 NO. 1JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK REAR ECU) 
    Fig 5: Identifying Junction Block Assembly Connector Terminals
    G04022303Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the LB, LC and LF junction block connectors.
    2. Measure the resistance and voltage of the wire harness side connectors.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      RP+B (LB-1) - Body ground B - Body ground +B (MPX-B) power supply Always 10 to 14 V
      MPX1 (LC-21) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (LC-31) - Body ground) GR - Body ground MPX line Always 10 kΩ or higher
      P-GND (LF-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      SG (LC-3) - 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.

  6. CHECK MULTIPLEX NETWORK DOOR ECU FRONT LH (DRIVER SIDE DOOR ECU) 
    Fig 6: Identifying Multiplex Network Door ECU Front Connector Terminals - LH
    G04022304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M3 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (M3-4) - Body ground LG - Body ground +B (CPUB) power supply Always 10 to 14 V
      BDR (M3-6) - Body ground L - Body ground +B (BDR) power supply Always 10 to 14 V
      MPX1 (M3-8) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPX2 (M3-9) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      GND (M3-1) - 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.

  7. CHECK MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT PASSENGER SIDE DOOR ECU) 
    Fig 7: Identifying Multiplex Network Door ECU Front Connector Terminals - RH
    G04022305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M4 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (M4-4) - Body ground LG - Body ground +B (CPUB) power supply Always 10 to 14 V
      BDR (M4-6) - Body ground L - Body ground +B (BDR) power supply Always 10 to 14 V
      MPX1 (M4-8) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (M4-9) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPX3 (M4-7) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      GND (M4-1) - 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.

  8. CHECK MULTIPLEX NETWORK DOOR ECU REAR LH (REAR DOOR LH) 
    Fig 8: Identifying Multiplex Network Door ECU Rear Connector Terminals - LH
    G04022306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P2 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (P2-4) - Body ground BR - Body ground +B (CPUB) power supply Always 10 to 14 V
      BDR (P2-6) - Body ground L - Body ground +B (BDR) power supply Always 10 to 14 V
      MPX1 (P2-8) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (P2-9) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPX3 (P2-7) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      GND (P2-1) - 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.

  9. CHECK MULTIPLEX NETWORK DOOR ECU REAR RH (REAR DOOR RH) 
    Fig 9: Identifying Multiplex Network Door ECU Rear Connector Terminals - RH
    G04022307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the O3 ECU connector.
    2. Measure the voltage the resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (O3-4) - Body ground G - Body ground +B (CPUB) power supply Always 10 to 14 V
      BDR (O3-6) - Body ground L - Body ground +B (BDR) power supply Always 10 to 14 V
      MPX1 (O3-8) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (O3-9) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPX3 (O3-7) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      GND (O3-1) - 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.

  10. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SIDE) 
    Fig 10: Identifying Position Control ECU And Switch Assembly Connector Terminals
    G04022308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the b7 and b8 ECU connectors.
    2. Measure the voltage and the resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (b7-5) - GND (b7-1) L - W-B +B (+B) power supply Always 10 to 14 V
      SYSB (b7-8) - Body ground G - Body ground +B (SYSB) power supply Always 10 to 14 V
      MPX1 (b7-1) - Body ground G-R - Body ground MPX line Always 10 kΩ or higher
      GND (b8-1) - 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.

  11. CHECK NO. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU) 
    Fig 11: Identifying Air Conditioning Amplifier Assembly Connector Terminals
    G04022309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K52 amplifier connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (K52-1) - GND (K52-20) L - Body ground +B power supply Always 10 to 14 V
      IG+ (K52-21) - Body ground W - W-B Engine switch signal (IG) Engine switch on (IG) 10 to 14 V
      MPX+ (K52-30) - Body ground SB - Body ground MPX line Always 10 kΩ or higher
      MPX- (K52-31) - Body ground G - Body ground MPX line Always 10 kΩ or higher
      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.

  12. CHECK AIRBAG SENSOR ASSEMBLY CENTER 
    Fig 12: Identifying Airbag Sensor Assembly Center Connector Terminals
    G04022310Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K44 sensor connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG2 (K44-21) - E1(A18-25) B - W-B Engine switch signal (IG) Engine switch on (IG) 10 to 14 V
      MPX1 (K44-13) - Body ground R - Body ground MPX line Always 10 kΩ or higher
      MPX2 (K44-22) - Body ground R - Body ground MPX line Always 10 kΩ or higher
      E1 (K44-25) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E2 (K44-26) - 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.

  13. CHECK COMBINATION METER ASSEMBLY (METER ECU) 
    Fig 13: Identifying Combination Meter Assembly Connector Terminals
    G04022311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K31 meter connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (K31-21) - Body ground B - Body ground +B (B) power supply Always 10 to 14 V
      B (K31-22) - Body ground L - Body ground +B (B) power supply Always 10 to 14 V
      MPX+ (k31-25) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      MPX- (K31-5) - Body ground SB - Body ground MPX line Always 10 kΩ or higher
      E2 (K31-40) - 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.

  14. CHECK SLIDING ROOF DRIVE GEAR SUBASSEMBLY (SLIDING ROOF CONTROL ECU) 
    Fig 14: Identifying Sliding Roof Drive Gear Subassembly Connector Terminals
    G04022312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the W7 driver gear connector.
    2. Measure the voltage and the resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (W7-5) - E (W7-7) L - W-B +B (B) power supply Always 10 to 14 V
      MPX1 (W7-10) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      E (W7-7) - 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.

  15. CHECK MULTIPLEX TILT AND TELESCOPIC ECU 
    Fig 15: Identifying Multiplex Tilt And Telescopic ECU Connector Terminals
    G04022313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K27 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ECUB (K27-9) - GND (K27-11) R - W-B +B (ECUB) power supply Always 11 to 14 V
      +B (K27-2) - GND (K27-11) L - W-B +B (+B) power supply Always 11 to 14 V
      MPX1 (K27-5) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      E (K27-11) - 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.

  16. CHECK COMBINATION SWITCH ASSEMBLY (WINDSHIELD WIPER SWITCH) 
    Fig 16: Identifying Combination Switch Assembly Connector Terminals
    G04022314Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K22 switch connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition
      B (K22-1) - E (K22-5) GR - W-B +B (B) power supply Always 10 to 14 V
      MPX1 (K22-6) - Body ground G - Body ground MPX line Always 10 kΩ or higher
      MPX2 (K22-7) - Body ground O - Body ground MPX line Always 10 kΩ or higher
      E (K22-5) - 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.

  17. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 
    Fig 17: Identifying Multiplex Network Master Switch Assembly Connector Terminals
    G04022315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R5 switch connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (R5-9) - E (R5-2) G - W-B +B (CPUB) power supply Always 10 to 14 V
      E (R5-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (R5-7) - E (R5-2) GR - W-B MPX line Always Below 1 Ω
      MPX2 (R5-8) - E (R5-2) P - W-B MPX line Always Below 1 Ω

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

  18. CHECK POWER SOURCE CONTROL ECU 
    Fig 18: Identifying Power Source Control ECU Connector Terminals
    G04022316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K73 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AM1 (K73-33) - GND2 (K73-6) O - W-B +B power supply Always 10 to 14 V
      AM2 (K73-12) - GND2 (K73-6) BR - W-B +B power supply Always 10 to 14 V
      MPX1 (K73-7) - Body ground LG - Body ground MPX line Always 10 kΩ or higher
      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.

  19. CHECK CERTIFICATION ECU 
    Fig 19: Identifying Certification ECU Connector Terminals
    G04022317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U28 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B1 (U28-1) - E (U28-17) G - W-B B power supply Always 10 to 14 V
      MPX1 (U28-31) - E (U28-17) GR - W-B MPX line Always 10 kΩ or higher
      MPX2 (U28-28) - E (U28-17) GR - W-B MPX line Always 10 kΩ or higher
      E (U28-17) - 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.

  20. CHECK TIRE PRESSURE WARNING ECU 
    Fig 20: Identifying Tire Pressure Warning ECU Connector Terminals
    G04022318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K45 ECU connector.
    2. Measure the resistance and voltage of the wire harness side connector.
      TERMINAL NUMBER AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (K45-1) - GND (K45-7) G - W-B Power supply Always 10 to 14 V
      MPX1 (K45-6) - GND (K45-7) GR - W-B MPX line Always 10 kΩ or higher
      MPX2 (K45-12) - GND (K45-7) GR - W-B MPX line Always 10 kΩ or higher
      GND (K45-7) - 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.

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