CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Main Body ECU)

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U1002 Lost Communication with Gateway Module (Main Body ECU) The main body ECU (multiplex network body ECU) cannot receive signals from all ECUs that have been memorized as those connected to sub bus 1.

  • Open or short in sub bus 1 main lines or connector

  • Short in sub bus 1 branch lines or connector

  • Main body ECU (multiplex network body ECU)

  • Front power seat switch (for Driver Side)

    (w/ Memory)

  • Multiplex tilt and telescopic ECU (for Power Tilt and Power Telescopic Steering Column)

  • Multiplex network door ECU

    (w/ Power Back Door System)

  • Outer mirror control ECU assembly LH (w/ Memory)

  • Outer mirror control ECU assembly RH (w/ Memory)

  • Open or short in No. 4 CAN junction connector

  • Open or short in No. 5 CAN junction connector

  • Open or short in No. 7 CAN junction connector

  • Open or short in No. 2 CAN junction terminal

 Main body ECU (multiplex network body ECU)

Tech Tips

This diagnostic procedure is for when DTC U1002 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

B00579IE02
B0057UNE08

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

Tech Tips


  • Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK SUB BUS 1


    1. Disconnect the cable from the negative (-) battery terminal.

    2. B005B7AC01
      *a

      Component with harness connected

      (Main Body ECU [Multiplex Network Body ECU])
      *b Front view of DLC3

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I47-9 (CANP) - I47-10 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or higher: Open circuit in main bus lines
      I47-9 (CANP) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      I47-10 (CANN) - I7-4 (CG) Below 200 Ω: CANL ground short
      I47-9 (CANP) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      I47-10 (CANN) - I7-16 (BAT) Below 6 kΩ: CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus lines B
      Between Lines C

      • +B short

      • Ground short

      		 D

    B

    CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR) Click here

    C

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Reconnect the cable to the negative (-) battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.


      Body Electrical > Main Body > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG).

    8. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from main body ECU (multiplex network body ECU) (GTS display: Main Body) B

    A

    SYMPTOM SIMULATION Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

  3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)


    1. B005B6BC01
      *a

      Rear view of wire harness connector

      (to No. 5 CAN Junction Connector)
      *b to No. 7 CAN Junction Connector
      *c to No. 4 CAN Junction Connector

      Disconnect the No. 5 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I97-5 (CANH) - I97-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 7 CAN junction connector
      I97-6 (CANH) - I97-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 4 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (No. 4 CAN junction connector CAN main wire) B
      NG (No. 7 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTOR Click here

    B

  4. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 7 CAN JUNCTION CONNECTOR)


    1. B005B6BC02
      *a

      Rear view of wire harness connector

      (to No. 7 CAN Junction Connector)
      *b to No. 5 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal

      Disconnect the No. 7 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Y22-5 (CANH) - Y22-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      Y22-7 (CANH) - Y22-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal CAN main wire) B
      NG (No. 5 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 7 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    B

  6. CONNECT CONNECTOR


    1. Connect the Y22 No. 7 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  7. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)


    1. B0059W2C11
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the No. 2 CAN junction terminal connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y23-3 (CANH) - Y23-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

  8. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  9. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)


    1. B005B6BC03
      *a

      Rear view of wire harness connector

      (to No. 4 CAN Junction Connector)
      *b to Main Body ECU (Multiplex Network Body ECU)
      *c to No. 5 CAN Junction Connector

      Disconnect the No. 4 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I96-4 (CANH) - I96-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      I96-7 (CANH) - I96-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Main body ECU [multiplex network ECU] CAN main wire) B
      NG (No. 5 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    B

  10. CONNECT CONNECTOR


    1. Connect the I96 No. 4 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  11. CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)


    1. B0059LDC01
      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

      Disconnect the main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-9 (CANP) - I47-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)


    1. B005B6BC10
      *a

      Rear view of wire harness connector

      (to No. 5 CAN Junction Connector)
      *b to Multiplex Tilt and Telescopic ECU (for LHD with Power Tilt and Power Telescopic Steering Column)
      *c to No. 7 CAN Junction Connector
      *d to No. 4 CAN Junction Connector
      *e to Front Power Seat Switch (for Driver Side) (for LHD with Memory)
      *f to Outer Mirror Control ECU Assembly LH (w/ Memory)

      Disconnect the No. 5 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I97-4 (CANH) - I97-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*1
      I97-5 (CANH) - I97-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 7 CAN junction connector
      I97-6 (CANH) - I97-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 4 CAN junction connector
      I97-7 (CANH) - I97-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front power seat switch (for driver side)*2
      I97-8 (CANH) - I97-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly LH*3
      *1: for LHD with Power Tilt and Power Telescopic Steering Column
      *2: for LHD with Memory
      *3: w/ Memory
      Result
      Result Proceed to
      OK A
      NG (No. 7 CAN junction connector CAN main wire) B
      NG (No. 4 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTOR Click here

    D

    GO TO STEP 28 Click here

    B

  13. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  14. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 CAN JUNCTION CONNECTOR)


    1. B005B6BC11
      *a

      Rear view of wire harness connector

      (to No. 7 CAN Junction Connector)
      *b to No. 5 CAN Junction Connector
      *c to Multiplex Network Door ECU (w/ Power Back Door System)
      *d to No. 2 CAN Junction Terminal

      Disconnect the No. 7 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Y22-5 (CANH) - Y22-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      Y22-6 (CANH) - Y22-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex network door ECU*
      Y22-7 (CANH) - Y22-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      *: w/ Power Back Door System
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction terminal CAN main wire) B
      NG (No. 5 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 7 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    D

    GO TO STEP 28 Click here

    B

  15. CONNECT CONNECTOR


    1. Connect the Y22 No. 7 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)


    1. B0059W2C11
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the No. 2 CAN junction terminal connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y23-3 (CANH) - Y23-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR)

  17. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  18. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)


    1. B005B6BC12
      *a

      Rear view of wire harness connector

      (to No. 4 CAN Junction Connector)
      *b to Multiplex Tilt and Telescopic ECU (for RHD with Power Tilt and Power Telescopic Steering Column)
      *c to Main Body ECU (Multiplex Network Body ECU)
      *d to Outer Mirror Control ECU Assembly RH (w/ Memory)
      *e to Front Power Seat Switch (for Driver Side) (for RHD with Memory)
      *f to No. 5 CAN Junction Connector

      Disconnect the No. 4 CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I96-3 (CANH) - I96-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*1
      I96-4 (CANH) - I96-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      I96-5 (CANH) - I96-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly RH*2
      I96-6 (CANH) - I96-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front power seat switch (for driver side)*3
      I96-7 (CANH) - I96-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      *1: for RHD with Power Tilt and Power Telescopic Steering Column
      *2: w/ Memory
      *3: for RHD with Memory
      Result
      Result Proceed to
      OK A
      NG (Main body ECU [multiplex network ECU] CAN main wire) B
      NG (No. 5 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    D

    GO TO STEP 28 Click here

    B

  19. CONNECT CONNECTOR


    1. Connect the I96 No. 4 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  20. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)


    1. B0059LDC01
      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

      Disconnect the main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-9 (CANP) - I47-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

  21. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 5 CAN junction connector.

      B00582LC01
      *a

      Rear view of wire harness connector

      (to No. 5 CAN Junction Connector)

      		 *b Front view of DLC3
      *c to Multiplex Tilt and Telescopic ECU (for LHD with Power Tilt and Power Telescopic Steering Column) *d to No. 7 CAN Junction Connector
      *e to No. 4 CAN Junction Connector *f to Front Power Seat Switch (for Driver Side) (for LHD with Memory)
      *g to Outer Mirror Control ECU Assembly LH (w/ Memory) - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I97-4 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Multiplex Tilt and Telescopic ECU*1
      I97-15 (CANL) - I7-16 (BAT)
      I97-4 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I97-15 (CANL) - I7-4 (CG)
      I97-5 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 7 CAN junction connector
      I97-16 (CANL) - I7-16 (BAT)
      I97-5 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I97-16 (CANL) - I7-4 (CG)
      I97-6 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 4 CAN junction connector
      I97-17 (CANL) - I7-16 (BAT)
      I97-6 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I97-17 (CANL) - I7-4 (CG)
      I97-7 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Front power seat switch (for driver side)*2
      I97-18 (CANL) - I7-16 (BAT)
      I97-7 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I97-18 (CANL) - I7-4 (CG)
      I97-8 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Outer mirror control ECU assembly LH*3
      I97-19 (CANL) - I7-16 (BAT)
      I97-8 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I97-19 (CANL) - I7-4 (CG)
      *1: for LHD with Power Tilt and Power Telescopic Steering Column
      *2: for LHD with Memory
      *3: w/ Memory
      Result
      Result Proceed to
      OK A
      NG (No. 7 CAN junction connector CAN main wire) B
      NG (No. 4 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTOR Click here

    D

    GO TO STEP 28 Click here

    B

  22. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  23. CHECK FOR SHORT IN CAN BUS WIRES (NO. 7 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 7 CAN junction connector.

      B00582LC02
      *a

      Rear view of wire harness connector

      (to No. 7 CAN Junction Connector)

      		 *b Front view of DLC3
      *c to No. 5 CAN Junction Connector *d to Multiplex Network Door ECU (w/ Power Back Door System)
      *e to No. 2 CAN Junction Terminal - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Y22-5 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 5 CAN junction connector
      Y22-16 (CANL) - I7-16 (BAT)
      Y22-5 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Y22-16 (CANL) - I7-4 (CG)
      Y22-6 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Multiplex network door ECU*
      Y22-17 (CANL) - I7-16 (BAT)
      Y22-6 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Y22-17 (CANL) - I7-4 (CG)
      Y22-7 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 2 CAN junction terminal
      Y22-18 (CANL) - I7-16 (BAT)
      Y22-7 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Y22-18 (CANL) - I7-4 (CG)
      *: w/ Power Back Door System
      Result
      Result Proceed to
      OK A
      NG (No. 5 CAN junction connector CAN main wire) B
      NG (Wire to ECU or sensor) C

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    C

    GO TO STEP 28 Click here

  24. CONNECT CONNECTOR


    1. Connect the I97 No. 5 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  25. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 4 CAN junction connector.

      B00582LC03
      *a

      Rear view of wire harness connector

      (to No. 4 CAN Junction Connector)

      		 *b Front view of DLC3
      *c to Multiplex Tilt and Telescopic ECU (for RHD with Power Tilt and Power Telescopic Steering Column) *d to Main Body ECU (Multiplex Network Body ECU)
      *e to Outer Mirror Control ECU Assembly RH (w/ Memory) *f to Front Power Seat Switch (for Driver Side) (for RHD with Memory)
      *g to No. 5 CAN Junction Connector - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I96-3 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Multiplex tilt and telescopic ECU*1
      I96-14 (CANL) - I7-16 (BAT)
      I96-3 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I96-14 (CANH) - I7-4 (CG)
      I96-4 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Main body ECU (multiplex network body ECU)
      I96-15 (CANL) - I7-16 (BAT)
      I96-4 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I96-15 (CANL) - I7-4 (CG)
      I96-5 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Outer mirror control ECU assembly RH*2
      I96-16 (CANL) - I7-16 (BAT)
      I96-5 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I96-16 (CANL) - I7-4 (CG)
      I96-6 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Front power seat switch (for driver side)*3
      I96-17 (CANL) - I7-16 (BAT)
      I96-6 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I96-17 (CANL) - I7-4 (CG)
      I96-7 (CANH) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 5 CAN junction connector
      I96-18 (CANL) - I7-16 (BAT)
      I96-7 (CANH) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I96-18 (CANL) - I7-4 (CG)
      *1: for RHD with Power Tilt and Power Telescopic Steering Column
      *2: w/ Memory
      *3: for RHD with Memory
      Result
      Result Proceed to
      OK A
      NG (No. 5 CAN junction connector CAN main wire) B
      NG (Main body ECU [multiplex network body ECU] CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    D

    CHECK SHORT IN CAN BUS WIRES Click here

    C

  26. CONNECT CONNECTOR


    1. Connect the I96 No. 4 CAN junction connector.

      Result
      Proceed to
      Next

    Next

  27. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)


    1. B005ACRC04
      *a

      Rear view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])
      *b Front view of DLC3

      Disconnect the main body ECU (multiplex network body ECU) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-9 (CANP) - I7-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      I47-10 (CANN) - I7-4 (CG)
      I47-9 (CANP) - I7-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher
      I47-10 (CANN) - I7-16 (BAT)
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 4 CAN JUNCTION CONNECTOR)

  28. CHECK SHORT IN CAN BUS WIRES


    1. Reconnect all wire harness connectors.

    2. B005B7AC01
      *a

      Component with harness connected

      (Main Body ECU [Multiplex Network Body ECU])
      *b Front view of DLC3

      Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line, +B or GND is connected.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-9 (CANP) - I47-10 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      I47-9 (CANP) - I7-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I47-10 (CANN) - I7-4 (CG)
      I47-9 (CANP) - I7-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      I47-10 (CANN) - I7-16 (BAT)

      Tech Tips


      • If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINES OR CONNECTOR