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Terminals Of Ecu

WARNING: This page is about a different car, the 2009 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GATEWAY ECU 
    1. Disconnect the gateway ECU connector.
      Fig 1: Identifying Multiplex Network Gateway ECU Connector Terminals
      GTY119296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J76-1 (IG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      J76-1 (IG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      J76-2 (ACC) - Body ground BE - Body ground Power source (ACC) Engine switch off Below 1 V
      J76-2 (ACC) - Body ground BE - Body ground Power source (ACC) Engine switch on (IG) 11 to 14 V
      J76-3 (MPD1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J76-4 (MPI1) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      J76-10 (BATT) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V
      J76-12 (MPD2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J76-13 (MPI2) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      J76-24 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω

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

  2. CHECK MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 
    1. Disconnect the main body ECU LH (cowl side junction block LH) connectors.
      Fig 2: Identifying Cowl Side Junction Block LH Connectors
      GTY114653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      A30-17 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      LD-3 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      LD-8 (SGND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      LD-9 (SGND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      LD-18 (MPXB) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V
      LJ-23 (BKUP) - Body ground Y - Body ground Power source (+B) Always 11 to 14 V
      Q3-15 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  3. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 
    1. Disconnect the main body ECU RH (cowl side junction block RH) connectors.
      Fig 3: Identifying Cowl Side Junction Block RH Connectors
      GTY143669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J75-21 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      RA-4 (GND2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RA-5 (GND2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RA-15 (ALTB) - Body ground SB - Body ground Power source (+B) Always 11 to 14 V
      RA-20 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      RD-7 (GND2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RD-11 (GND2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RD-17 (GND1) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      RJ-21 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      RK-5 (BECU) - Body ground G-R - Body ground Power source (+B) Always 11 to 14 V
      RM-1 (IG) - Body ground B-W - Body ground Power source (IG) Engine switch off Below 1 V
      RM-1 (IG) - Body ground B-W - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      RN-1 (BATB) - Body ground R - Body ground Power source (+B) Always 11 to 14 V

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

  4. CHECK MULTIPLEX TILT AND TELESCOPIC ECU 
    1. Disconnect the multiplex tilt and telescopic ECU connector.
      Fig 4: Identifying Tilt & Telescopic ECU Connector Terminals
      GTY119298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J28-2 (+B) - Body ground SB - Body ground Power source (+B) Always 11 to 14 V
      J28-5 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J28-8 (IG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      J28-8 (IG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      J28-9 (ECUB) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V
      J28-11 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω

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

  5. CHECK MULTIPLEX NETWORK MASTER SWITCH 
    1. Disconnect the multiplex network master switch connector.
      Fig 5: Identifying Multiplex Network Master Switch Connector Terminals
      GTY140057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M18-12 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      M18-3 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      M18-2 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      M18-15 (CPUB) - Body ground G - Body ground Power source (+B) Always 11 to 14 V
      M18-18 (SIG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      M18-18 (SIG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V

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

  6. CHECK OUTER MIRROR CONTROL ECU LH 
    1. Disconnect the outer mirror control ECU LH connector.
      Fig 6: Identifying Outer Mirror Control ECU LH Connector Terminals
      GTY119299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      M10-1 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      M10-3 (SIG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      M10-3 (SIG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      M10-4 (CPUB) - Body ground G - Body ground Power source (+B) Always 11 to 14 V
      M10-6 (BDR) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      M10-8 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  7. CHECK FRONT POWER SEAT SWITCH RH (POSITION CONTROL ECU) 
    1. Disconnect the front power seat switch RH (position control ECU) connectors.
      Fig 7: Identifying Power Seat Control ECU RH Connector Terminals
      GTY143766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      T6-1 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      T6-5 (+B) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      T7-1 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      T7-4 (IG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      T7-4 (IG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      T7-8 (SYSB) - Body ground P - Body ground Power source (+B) Always 11 to 14 V

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

  8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Disconnect the front certification ECU (smart key ECU assembly) connector.
      Fig 8: Identifying Certification ECU Connector Terminals
      GTY131756Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      P33-1 (+B1) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      P33-17 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      P33-18 (IG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      P33-18 (IG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      P33-19 (ACC) - Body ground BE - Body ground Power source (ACC) Engine switch off Below 1 V
      P33-19 (ACC) - Body ground BE - Body ground Power source (ACC) Engine switch on (IG) 11 to 14 V
      P33-27 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      P33-28 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  9. CHECK FRONT CONTROLLER (ENGINE ROOM RELAY BLOCK NO. 2) 
    1. Disconnect the front controller (engine room relay block No. 2) connectors.
      Fig 9: Identifying Front Controller ECU Connector Terminals
      GTY130642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      2E-3 (FMIG) - Body ground B-Y - Body ground Power source (IG) Engine switch off Below 1 V
      2E-3 (FMIG) - Body ground B-Y - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      2E-4 (FMBB) - Body ground G-R - Body ground Power source (+B) Always 11 to 14 V
      2F-1 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      2F-6 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      2F-5 (MPX1) - Body ground L - Body ground MPX line Always 10 kΩ or higher

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

  10. CHECK OUTER MIRROR CONTROL ECU RH 
    1. Disconnect the outer mirror control ECU RH connector.
      Fig 10: Identifying Outer Mirror Control ECU RH Connector Terminals
      GTY119303Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      L10-1 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      L10-3 (SIG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      L10-3 (SIG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      L10-4 (CPUB) - Body ground G - Body ground Power source (+B) Always 11 to 14 V
      L10-6 (BDR) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      L10-8 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  11. CHECK FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU) 
    1. Disconnect the front power seat switch LH (position control ECU) connectors.
      Fig 11: Identifying Front Power Seat Position Control ECU LH Connector Terminals
      GTY119302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      U6-1 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      U6-5 (+B) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      U7-1 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      U7-4 (IG) - Body ground Y - Body ground Power source (IG) Engine switch off Below 1 V
      U7-4 (IG) - Body ground Y - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      U7-8 (SYSB) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V

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

  12. CHECK SLIDING ROOF CONTROL ECU 
    1. Disconnect the sliding roof control ECU connector.
      Fig 12: Identifying Sliding Roof Control ECU Connector Terminals
      GTY119304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      R6-5 (B) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      R6-6 (IG) - Body ground V - Body ground Power source (IG) Engine switch off Below 1 V
      R6-6 (IG) - Body ground V - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      R6-7 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      R6-10 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  13. CHECK RAIN SENSOR 
    1. Disconnect the rain sensor connector.
      Fig 13: Identifying Rain Sensor Connector Terminals
      GTY119305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      R7-1 (SIG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      R7-1 (SIG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      R7-2 (MPX) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  14. CHECK POWER SOURCE CONTROL ECU 
    1. Disconnect the power source control ECU connector.
      Fig 14: Identifying Power Source Control ECU Connector Terminals
      GTY142746Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J55-6 (GND2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      J55-7 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J55-12 (AM2) - Body ground BE - Body ground Power source (+B) Always 11 to 14 V
      J55-24 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J55-33 (AM1) - Body ground BE - Body ground Power source (+B) Always 11 to 14 V

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

  15. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Disconnect the windshield wiper switch assembly connector.
      Fig 15: Identifying Windshield Wiper Switch Assembly Connector Terminals
      GTY136938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J26-1 (B) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V
      J26-2 (IG) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      J26-2 (IG) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      J26-5 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      J26-6 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      J26-7 (MPX2) - Body ground GR - Body ground MPX line Always 10 kΩ or higher

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

  16. CHECK COMBINATION METER ECU 
    1. Disconnect the combination meter ECU connector.
      Fig 16: Identifying Combination Meter ECU Connector Terminals
      GTY119306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J34-1 (E2) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      J34-6 (MPX+) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      J34-12 (IG+) - Body ground BE - Body ground Power source (IG) Engine switch off Below 1 V
      J34-12 (IG+) - Body ground BE - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      J34-13 (ES) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      J34-18 (MPX-) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      J34-23 (B) - Body ground L - Body ground Power source (+B) Always 11 to 14 V
      J34-24 (B) - Body ground LG - Body ground Power source (+B) Always 11 to 14 V

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

  17. CHECK CLEARANCE WARNING ECU 
    1. Disconnect the clearance warning ECU connector.
      Fig 17: Identifying Clearance Warning ECU Connector Terminals
      GTY119307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      Q37-8 (IG) - Body ground Y - Body ground Power source (IG) Engine switch off Below 1 V
      Q37-8 (IG) - Body ground Y - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      Q37-26 (M+) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      Q37-27 (E) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω

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

  18. CHECK AFS ECU 
    1. Disconnect the AFS ECU connector.
      Fig 18: Identifying AFS ECU Connector Terminals
      GTY123123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      A27-1 (E1) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      A27-2 (IG) - Body ground B-O - Body ground Power source (IG) Engine switch off Below 1 V
      A27-2 (IG) - Body ground B-O - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      A27-5 (MPX1) - Body ground BR-R - Body ground MPX line Always 10 kΩ or higher
      A27-6 (MPX2) - Body ground BR - Body ground MPX line Always 10 kΩ or higher

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

  19. CHECK AIR CONDITIONING ECU 
    1. Disconnect the air conditioning ECU connector.
      Fig 19: Identifying Air Conditioning ECU Connector Terminals
      GTY141191Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J58-1 (B) - Body ground Y - Body ground Power source (+B) Always 11 to 14 V
      J58-20 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      J58-21 (IG+) - Body ground B - Body ground Power source (IG) Engine switch off Below 1 V
      J58-21 (IG+) - Body ground B - Body ground Power source (IG) Engine switch on (IG) 11 to 14 V
      J58-30 (MPX+) - Body ground BR - Body ground MPX line Always 10 kΩ or higher
      J58-31 (MPX-) - Body ground BR - Body ground MPX line Always 10 kΩ or higher

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

  20. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER 
    1. Disconnect the tire pressure warning ECU and receiver connector.
      Fig 20: Identifying Tire Pressure Warning ECU & Receiver Connector Terminals
      GTY144370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J49-1 (IG) - Body ground B - Body ground IG power source Engine switch on (IG) 11 to 14 V
      J49-2 (MPX2) - Body ground BR - Body ground MPX line Engine switch on (IG) 10 kΩ or higher
      J49-3 (MPX1) - Body ground BR - Body ground MPX line Engine switch on (IG) 10 kΩ or higher
      J49-6 (GND) - Body ground W-B - Body ground Tire pressure warning ECU and receiver ground Always Below 1 Ω

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

  21. CHECK OVERHEAD JUNCTION BLOCK 
    1. Disconnect the overhead junction block connector.
      Fig 21: Identifying Overhead Junction Block Connector Terminals
      GTY128987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      R5-1 (+B1) - Body ground L - Body ground Power source (IG) Always 11 to 14 V
      R5-18 (GND3) - Body ground W-B - Body ground Ground Always Below 1 Ω
      R5-36 (MPX) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      R5-37 (MPX1) - Body ground GR - Body ground MPX line Always 10 kΩ or higher
      R5-38 (MPX2) Body ground GR - Body ground MPX line Always 10 kΩ or higher
      R5-39 (GND) - 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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