LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2004 >> RX 330 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 455 (Multiplex Communication System - Diagnostics) >> Terminals Of Ecu

Terminals Of Ecu

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT INSTRUMENT PANEL J/B ASSY (MULTIPLEX NETWORK BODY ECU) 
    Fig 1: Identifying Multiplex Network Body ECU Connector Terminals
    G03010023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B5 ECU, 1D, 1E, 1F, 1M and 1R J/B connectors.
    2. Check the voltage and resistance between each terminal of the wire harness side connectors.

      Standard: 

      MULTIPLEX NETWORK BODY ECU CONNECTOR TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (1D-10) - Body ground L-B - Body ground +B (ECUB) power supply Constant 10 to 14 V
      BECU (1F-1) - Body ground SB - Body ground +B (ECUB) power supply Constant 10 to 14 V
      MPX1 (1E-7) - Body ground BR - Body ground MPX line Constant 10 kΩ or higher
      MPX1 (1R-9) - Body ground LG - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (B5-21) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      GND1 (1F-10) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      GND2 (1M-9) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  2. CHECK INTEGRATION SWITCH (w/o LEXUS NAVIGATION SYSTEM) 
    Fig 2: Identifying Integration Switch Connector Terminals (W/O Lexus Navigation System)
    G03010024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C4 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (C4-1) - GND (C4-7) O - W-B +B (+B) power supply Constant 10 to 14 V
      MPX+ (C4-5) - Body ground L - Body ground MPX line Constant 10 kΩ or higher
      MPX- (C4-12) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      GND (C4-7) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  3. CHECK NETWORK GATEWAY ECU (w/LEXUS NAVIGATION SYSTEM) 
    Fig 3: Identifying Network Gateway ECU Connector Terminals (W/Lexus Navigation System)
    G03010025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the G3 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (G3-8) - GND (G3-14) O - W-B +B (BATT) power supply Constant 10 to 14 V
      MPD1 (G3-4) - Body ground L - Body ground MPX line Constant 10 kΩ or higher
      MPD2 (G3-11) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      CG (G3-7) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  4. CHECK ECM 
    1. Disconnect the E5, E6 and E7 ECM connectors.
      2. Fig 4: Disconnecting E5, E6 And E7 ECM Connectors
      G03010026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (E5-3) - E1 (E7-1) B - BR +B (BATT) power supply Constant 10 to 14 V
      IGSW (E5-9) - E1 (E7-1) G - BR Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      +B (E5-1) - E1 (E7-1) L-B - BR +B (+B) power supply Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      +B2 (E5-2) - E1 (E7-1) L-B - BR +B (+B2) power supply Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      MPX1 (E6-18) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (E6-29) - Body ground O - Body ground MPX line Constant 10 kΩ or higher
      E1 (E7-1) - Body ground BR - Body ground Ground Constant Below 1 Ω
      ME01 (E7-4) - Body ground W-B - Body grand Ground Constant Below 1 Ω

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

  5. CHECK TRANSPONDER KEY ECU ASSY 
    1. Disconnect the T9 ECU connector.
      2. Fig 5: Identifying Transponder Key ECU Assy Connector Terminals
      G03010027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (T9-1) - GND (T9-14) V - W-B +B (CPUB) power supply Constant 10 to 14 V
      MPX1 (T9-4) - Body ground O - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (T9-5) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      GND (T9-14) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  6. CHECK MULTIPLEX TILT & TELESCOPIC ECU 
    1. Disconnect the T4 ECU connector.
      2. Fig 6: Identifying Multiplex Tilt & Telescopic ECU Connector Terminals
      G03010028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (T4-2) - GND (T4-11) Y - W-B +B (+B) power supply Constant 10 to 14 V
      ECUB (T4-9) - GND (T4-11) SB - W-B +B (ECUB) power supply Constant 10 to 14 V
      MPX1 (T4-5) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (T4-14) -Body ground O - Body ground MPX line Constant 10 kΩ or higher
      GND (T4-11) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  7. CHECK A/C AMPLIFIER (A/C ECU) 
    Fig 7: Identifying A/C Amplifier Connector Terminals (A/C ECU)
    G03010029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A8 amplifier connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (A8-2) - GND (A8-6) SB - W-B +B (+B) power supply Constant 10 to 14 V
      MPX+ (A8-3) -Body ground BR - Body ground MPX line Constant 10 kΩ or higher
      MPX- (A8-4) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      GND (A8-6) - Body ground W-B - Body ground Ground Constant 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 ASSY (PASSENGER SIDE) 
    Fig 8: Identifying Outer Mirror Control ECU Assy Connector Terminals (Passenger Side)
    G03010030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R22 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (R22-7) - GND (R22-1) L-B - W-B +B (CPUB) power supply Constant 10 to 14 V
      BDR (R22-3) - GND (R22-1) G - W-B +B (BDR) power supply Constant 10 to 14 V
      MPX1 (R22-6) - Body ground L - Body ground MPX line Constant 10 kΩ or higher
      GND (R22-1) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  9. CHECK OUTER MIRROR CONTROL ECU ASSY (DRIVER SIDE) 
    Fig 9: Identifying Outer Mirror Control ECU Assy Connector Terminals (Driver Side)
    G03010031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R21 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (R21-7) - GND (R21-1) L-B - W-B +B (CPUB) power supply Constant 10 to 14 V
      BDR (R21-3) - GND (R21-1) G - W-B +B (BDR) power supply Constant 10 to 14 V
      MPX1 (R21-6) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      GND (R21-1) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  10. CHECK WINDSHIELD WIPER RELAY ASSY (WIPER ECU) 
    Fig 10: Identifying Windshield Wiper Relay Assy Connector Terminals (Wiper ECU)
    G03010032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A28 relay connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (A28-8) - E (A28-12) SB - W-B +B (+B) power supply Constant 10 to 14 V
      MPX1 (A28-1) - Body ground BR - Body ground MPX line Constant 10 kΩ or higher
      E (A28-12) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  11. CHECK POSITION CONTROL ECU & SWITCH (POWER SEAT ECU) 
    Fig 11: Identifying Position Control ECU & Switch Connector Terminals (Power Seat ECU)
    G03010033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P32 and P33 ECU connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (P33-5) - GND (P33-1) LG - W-B +B (+B) power supply Constant 10 to 14 V
      SYSB (P32-8) - GND (P33-1) GR - W-B +B (SYSB) power supply Constant 10 to 14 V
      IG (P32-4) - GND (P33-1) Y - W-B Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      MPX1 (P32-1) - Body ground W - Body ground MPX line Constant 10 kΩ or higher
      GND (P33-1) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  12. CHECK MULTIPLEX NETWORK DOOR ECU BACK (BACK DOOR ECU) 
    Fig 12: Identifying Multiplex Network Door ECU Back Connector Terminals (Back Door ECU)
    G03010034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P13 and P14 ECU connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (P14-2) - GND (P14-8) Y - W-B +B (+B) power supply Constant 10 to 14 V
      ECUB (P13-10) - GND (P14-8) BR - W-B +B (ECUB) power supply Constant 10 to 14 V
      IG (P13-9) - GND (P14-8) GR - W-B Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      MPX1 (P13-22) - Body ground SB - Body ground MPX line Constant 10 kΩ or higher
      GND (P14-8) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  13. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSY 
    Fig 13: Identifying Power Window Regulator Master Switch Assy Connector Terminals
    G03010035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P22 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BDR (P22-10) -GND (P22-2) G - W-B +B (BDR) power supply Constant 10 to 14 V
      CPUB (P22-9) - GND (P22-2) L-B - W-B +B (CPUB) power supply Constant 10 to 14 V
      MPX1 (P22-7) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (P22-8) - Body ground GR - Body ground MPX line Constant 10 kΩ or higher
      GND (P22-2) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  14. CHECK COMBINATION METER ASSY 
    Fig 14: Identifying Combination Meter Assy Connector Terminals
    G03010036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the C8 and C9 meter connectors.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (C8-15) - GND (C8-1) SB - W-B +B (B) power supply Constant 10 to 14 V
      ECUB (C8-16) - GND (C8-1) O - W-B +B (ECUB) power supply Constant 10 to 14 V
      MPX+ (C8-5) - Body ground Y - Body ground MPX line Constant 10 kΩ or higher
      MPX- (C9-4) - Body ground V - Body ground MPX line Constant 10 kΩ or higher
      GND (C8-1) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  15. CHECK AIRBAG SENSOR ASSY (AIRBAG ECU) 
    Fig 15: Identifying Airbag Sensor Assy Connector Terminals (Airbag ECU)
    G03010037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A20 sensor connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG2 (A20-5) - E1 (A20-27) B - W-B Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      MPX1 (A20-24) - Body ground BR - Body ground MPX line Constant 10 kΩ or higher
      MPX2 (A20-22) - Body ground BR - Body ground MPX line Constant 10 kΩ or higher
      E1 (A20-27) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      E2 (A20-28) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  16. CHECK SLIDING ROOF DRIVE GEAR ASSY (SLIDING ROOF ECU (STANDARD TYPE)) 
    Fig 16: Identifying Sliding Roof Drive Gear Assy Connector Terminals (Sliding Roof ECU (Standard Type))
    G03010038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M12 gear connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (M12-1) - E (M12-7) P - W-B +B (B) power supply Constant 10 to 14 V
      ECUB (M12-5) - E (M12-7) SB - W-B +B (ECUB) power supply Constant 10 to 14 V
      MPX1 (M12-10) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      E (M12-7) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  17. CHECK SLIDING ROOF DRIVE GEAR ASSY (SLIDING ROOF ECU (MULTI-PANEL MOON ROOF TYPE)) 
    Fig 17: Identifying Sliding Roof Drive Gear Assy Connector Terminals (Sliding Roof ECU (Multi-Panel Moon Roof Type))
    G03010039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M12 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (M12-4) - E (M12-8) P - W-B +B (B) power supply Constant 10 to 14 V
      ECUB (M12-10) - E (M12-8) SB - W-B +B (ECUB) power supply Constant 10 to 14 V
      MPX1 (M12-5) - Body ground R - Body ground MPX line Constant 10 kΩ or higher
      E (M12-8) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  18. CHECK RAIN SENSOR 
    Fig 18: Identifying Rain Sensor Connector Terminals
    G03010040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R7 sensor connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SIG (R7-1) - ES (R7-3) P - W-B +B (SIG) power supply Constant 10 to 14 V
      MPX1 (R7-2) - Body ground V - Body ground MPX line Constant 10 kΩ or higher
      ES (R7-3) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

  19. CHECK HEADLAMP SWIVEL ECU (AFS ECU) 
    Fig 19: Identifying Headlamp Swivel ECU Connector Terminals (AFS ECU)
    G03010041Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A14 ECU connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      VOLTAGE AND RESISTANCE CHECK SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IGS (A14-12) - E1 (A14-1) P - W-B Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      IG (A14-2) - E1 (A14-1) P - W-B Ignition switch Ignition Switch OFF --> ON 0 V --> 10 to 14 V
      MPX1 (A14-5) - Body ground W - Body ground MPX line Constant 10 kΩ or higher
      E1S (A14-11) - Body ground W-B - Body ground Ground Constant Below 1 Ω

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

scientia non olet · About LEMON Manuals