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Ecu Connector Terminal Identification

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GATEWAY ECU 
    1. Disconnect the E23 ECU connector.
      Fig 1: Identifying Gateway ECU Connector Terminals
      G05007066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BATT (E23-10) - Body ground B - Body ground Power supply (Back-up) Always 10 to 14 V
      IG (E23-1) - Body ground W - Body ground Power supply (IG) Ignition switch: OFF → ON (IG) Below 1 V → 10 to 14 V
      ACC (E23-2) - Body ground R - Body ground Power supply (ACC) Ignition switch: OFF → ON (ACC) Below 1 V → 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (E23-24) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPD1 (E23-3) - Body ground G - Body ground MPX line Always 10 kΩ or higher
      MPD2 (E23-12) - Body ground P - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  2. CHECK RAIN SENSOR 
    1. Disconnect the N3 ECU connector.
      Fig 2: Identifying Rain Sensor Connector Terminals
      G05408779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SIG (N3-1) - Body ground V - Body ground Power supply (IG) Ignition switch: OFF → ON (IG) Below 1 V → 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ES (N3-3) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX (N3-2) - Body ground L - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  3. CHECK BODY ECU 
    1. Disconnect the II, IA, IE, IF, IM, IR and D6 ECU connectors.
      Fig 3: Identifying Body ECU Connector Terminals
      G05408780Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (II-9) - Body ground LG-Body ground (1)
      G - Body ground (2)      		 Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      ACC (II-3) - Body ground R-Body ground (1)
      O - Body ground (2)      		 Power supply (ACC) Ignition switch: off → on (ACC) Below 1 V → 10 to 14 V
      BATB (IA-1) - Body ground B - Body ground Power supply (Back-up) Always 10 to 14 V
      GSW (IE-8) G Airbag sensor communication signal Airbag sensor communication circuit -
      (1) w/ Smart Key System
      (2) w/o Smart Key System

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GSW (IE-8) G Airbag sensor communication signal Airbag sensor communication circuit -
      GND1 (IF-10) - Body ground W-B - Body ground Ground Always Below 1 Ω
      GND2 (IM-9) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (IR-9) - Body ground B - Body ground MPX line Always 10 kΩ or higher
      MPX2 (D6-21) - Body ground BR - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  4. CHECK A/C ECU 
    1. Disconnect the D37 ECU connector.
      Fig 4: Identifying A/C ECU Connector Terminals
      G05007069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (D37-21) - Body ground G - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      B (D37-1) - Body ground SB - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (D37-20) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX+ (D37-30) - Body ground LG - Body ground (1)
      B - Body ground (2)      		 MPX line Always 10 kΩ or higher
      MPX- (D37-31) - Body ground L - Body ground MPX line Always 10 kΩ or higher
      (1) w/ Smart Key System
      (2) w/o Smart Key System

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  5. CHECK POWER SOURCE CONTROL ECU 
    1. Disconnect the D44 ECU connector.
      Fig 5: Identifying Power Source Control ECU Connector Terminals
      G05007070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ACCD (D44-11) - Body ground R - Body ground Power supply (ACC) Ignition switch: off → on (ACC) Below 1 V → 10 to 14 V
      AM1 (D44-33) - Body ground W - Body ground Power supply (Back-up) Always 10 to 14 V
      AM2 (D44-12) - Body ground L - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND2 (D44-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (D44-7) - Body ground B - Body ground MPX line Always 10 kΩ or higher
      MPX2 (D44-24) - Body ground LG - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  6. CHECK CERTIFICATION ECU 
    1. Disconnect the D39 ECU connectors.
      Fig 6: Identifying Certification ECU Connector Terminals
      G05007071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (D39-18) - Body ground Y - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      ACC (D39-19) - Body ground SB - Body ground Power supply (ACC) Ignition switch: off → on (ACC) Below 1 V → 10 to 14 V
      +B1 (D39-1) - Body ground R - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E (D39-17) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (D39-27) - Body ground R - Body ground MPX line Always 10 kΩ or higher
      MPX2 (D39-28) - Body ground B - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  7. CHECK COMBINATION SWITCH ECU 
    1. Disconnect the D13 ECU connector.
      Fig 7: Identifying Combination Switch ECU Connector Terminals
      G05007072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (D13-2) - Body ground L - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      B (D13-1) - Body ground W - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      E (D13-5) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (D13-6) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      MPX2 (D13-7) - Body ground R-Body ground (1)
      B - Body ground (2)      		 MPX line Always 10 kΩ or higher
      (1) w/ Smart Key System
      (2) w/o Smart Key System

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  8. CHECK POWER SEAT ECU 
    1. Disconnect the P13 and P14 ECU connectors.
      Fig 8: Identifying Power Seat ECU Connector Terminals
      G05408785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (P13-4) - Body ground Y - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      +B (P14-5) - Body ground LG - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (P14-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (P13-1) - Body ground O - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  9. CHECK MEMORY MIRROR ECU (LH) 
    1. Disconnect the H1 ECU connector.
      Fig 9: Identifying Memory Mirror ECU Connector Terminals (LH)
      G05408786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SIG (H1-3) - Body ground GR - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      CPUB (H1-4) - Body ground W - Body ground Power supply (Back-up) Always 10 to 14 V
      BDR (H1-6) - Body ground W - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (H1-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (H1-8) - Body ground BR - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  10. CHECK MEMORY MIRROR ECU (RH) 
    1. Disconnect the G1 ECU connector.
      Fig 10: Identifying Memory Mirror ECU Connector Terminals (RH)
      G05408787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SIG (G1-3) - Body ground GR - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      CPUB (G1-4) - Body ground W - Body ground Power supply (Back-up) Always 10 to 14 V
      BDR (G1-6) - Body ground V - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (G1-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX1 (G1-8) - Body ground B - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  11. CHECK FRONT CONTROLLER 
    1. Disconnect the 1E, 1H and 1G ECU connectors.
      Fig 11: Identifying Front Controller Connector Terminals
      G05007076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      1E-2 - Body ground Y - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      1H-4 - Body ground LG - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      1G-7 - Body ground Y - Body ground MPX line Always 10 kΩ or higher
      1G-8 - Body ground B - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  12. CHECK COMBINATION METER ECU 
    1. Disconnect the E2 ECU connectors.
      Fig 12: Identifying Combination Meter ECU Connector Terminals
      G05007077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage between the specified terminals on the wire harness side connector.

      Voltage: 

      VOLTAGE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (E2-13) - Body ground R - Body ground Power supply (IG) Ignition switch: off → on (IG) Below 1 V → 10 to 14 V
      B (E2-2) - Body ground B - Body ground Power supply (Back-up) Always 10 to 14 V

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

    3. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ES (E2-10) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MPX- (E2-4) - Body ground P - Body ground MPX line Always 10 kΩ or higher
      MPX+ (E2-16) - Body ground LG - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  13. CHECK OPTION CONNECTOR 
    1. Disconnect the D16 ECU connector.
      Fig 13: Identifying Option Connector Terminals
      G05007078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the specified terminals on the wire harness side connector.

      Resistance: 

      RESISTANCE SPECIFICATION

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      MPX+ (D16-1) - Body ground W - Body ground MPX line Always 10 kΩ or higher

      If the values do not conform to the conditions specified, there may be a malfunction on the wire harness side.

  14. AIRBAG SENSOR ASSEMBLY 
    Fig 14: Identifying Airbag Sensor Connector Terminals
    G05408791Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION AND SPECIFIED CONDITION

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    GSW (D23-18) G Airbag sensor communication signal Airbag sensor communication circuit -
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