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 Note
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)

  • Outer mirror control ECU assembly (for driver side)

    (w/ Seat Position Memory System)

  • Outer mirror control ECU assembly (for front passenger side)

    (w/ Seat Position Memory System)

  • Position control ECU and switch assembly LH

  • Position control ECU and switch assembly RH

  • Multiplex tilt and telescopic ECU

    (w/ Power Tilt and Power Telescopic System)

  • Headlight light control ECU sub-assembly LH

    (for Triple Beam Headlight)

  • Open or short in No. 5 CAN junction connector

    (for LHD)

  • Open or short in No. 6 CAN junction connector

    (for RHD)

  • Open or short in No. 10 CAN junction connector

    (for LHD)

  • Open or short in No. 16 CAN junction connector

    (for RHD)

  • Open or short in No. 1 CAN junction terminal

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

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

Figure 1. for LHD:

B0076I9E10

Figure 2. for RHD:

B0076I9E08

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

  • 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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK SUB BUS 1 Click here

    A

  2. CHECK SUB BUS 1


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

    2. B0077LEC21
      *1 DLC3
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or more: Open circuit in main bus lines
      O1-9 (CANP) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O1-10 (CANN) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O1-9 (CANP) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O1-10 (CANN) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Result
      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus lines) B
      NG (Short circuit between bus lines) C

      • NG (Short to ground)

      • NG (+B short)

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 5 CAN JUNCTION CONNECTOR) Click here

    A

  3. 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 the main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from the 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) Click here

  4. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00777GC28
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  5. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O101 No. 1 CAN junction terminal connector.

    3. B0075JKC39
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O101-3 (CANH) - O101-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  6. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 5 CAN JUNCTION CONNECTOR)


    1. Reconnect the O101 No. 1 CAN junction terminal connector.

    2. Disconnect the O106 No. 5 CAN junction connector.

    3. B0076YHC56
      *a

      Front view of wire harness connector

      (to No. 5 CAN Junction Connector)
      *b to No. 10 CAN Junction Connector
      *c to Main Body ECU (Multiplex Network Body ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O106-2 (CANH) - O106-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      O106-3 (CANH) - O106-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to No. 10 CAN junction connector) C

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

  7. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 10 CAN JUNCTION CONNECTOR)


    1. Reconnect the O106 No. 5 CAN junction connector.

    2. Disconnect the T32 No. 10 CAN junction connector.

    3. B0074FGC05
      *a

      Front view of wire harness connector

      (to No. 10 CAN Junction Connector)
      *b to No. 5 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T32-8 (CANH) - T32-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      T32-11 (CANH) - T32-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (Line to No. 5 CAN junction connector) B
      NG (Line to No. 1 CAN junction terminal) C

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

  8. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00777GC29
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  9. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O101 No. 1 CAN junction terminal connector.

    3. B0075JKC40
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O101-3 (CANH) - O101-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  10. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 5 CAN JUNCTION CONNECTOR)


    1. Reconnect the O101 No. 1 CAN junction terminal connector.

    2. Disconnect the O106 No. 5 CAN junction connector.

    3. B0076YHC58
      *a

      Front view of wire harness connector

      (to No. 5 CAN Junction Connector)
      *b

      to Multiplex Tilt and Telescopic ECU

      (w/ Power Tilt and Power Telescopic System)
      *c to No. 10 CAN Junction Connector
      *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (w/ Seat Position Memory System)
      *f

      to Headlight Light Control ECU Sub-assembly LH

      (for Triple Beam Headlight)
      *g to Position Control ECU and Switch Assembly LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O106-1 (CANH) - O106-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*1
      O106-2 (CANH) - O106-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      O106-3 (CANH) - O106-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      O106-4 (CANH) - O106-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly (for driver side)*2
      O106-5 (CANH) - O106-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Headlight light control ECU sub-assembly LH*3
      O106-6 (CANH) - O106-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly LH

      • *1: w/ Power Tilt and Power Telescopic System

      • *2: w/ Seat Position Memory System

      • *3: for Triple Beam Headlight

      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 10 CAN junction connector) D

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

    GO TO STEP 25 Click here

    D

  11. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 10 CAN JUNCTION CONNECTOR)


    1. Reconnect the O106 No. 5 CAN junction connector.

    2. Disconnect the T32 No. 10 CAN junction connector.

    3. B0074FGC07
      *a

      Front view of wire harness connector

      (to No. 10 CAN Junction Connector)
      *b to No. 5 CAN Junction Connector
      *c to Position Control ECU and Switch Assembly RH
      *d

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (w/ Seat Position Memory System)
      *e to No. 1 CAN Junction Terminal

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T32-8 (CANH) - T32-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 5 CAN junction connector
      T32-9 (CANH) - T32-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly RH
      T32-10 (CANH) - T32-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly (for front passenger side)*
      T32-11 (CANH) - T32-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction terminal

      • *: w/ Seat Position Memory System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 5 CAN junction connector) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 1 CAN junction terminal) D

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    C

    GO TO STEP 25 Click here

    D

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

  12. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 5 CAN JUNCTION CONNECTOR)


    1. Disconnect the O106 No. 5 CAN junction connector.

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

      B0073LAC36
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 5 CAN Junction Connector)

      		 *b

      to Multiplex Tilt and Telescopic ECU

      (w/ Power Tilt and Power Telescopic System)
      *c to No. 10 CAN Junction Connector *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (w/ Seat Position Memory System)

      		 *f

      to Headlight Light Control ECU Sub-assembly LH

      (for Triple Beam Headlight)
      *g to Position Control ECU and Switch Assembly LH - -
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      O106-1 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Multiplex tilt and telescopic ECU*1
      O106-12 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-2 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 10 CAN junction connector
      O106-13 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-3 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Main body ECU (multiplex network body ECU)
      O106-14 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-4 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Outer mirror control ECU assembly (for driver side)*2
      O106-15 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-5 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Headlight light control ECU sub-assembly LH*3
      O106-16 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-6 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly LH
      O106-17 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O106-1 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Multiplex tilt and telescopic ECU*1
      O106-12 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O106-2 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 10 CAN junction connector
      O106-13 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O106-3 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Main body ECU (multiplex network body ECU)
      O106-14 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O106-4 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly (for driver side)*2
      O106-15 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O106-5 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Headlight light control ECU sub-assembly LH*3
      O106-16 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O106-6 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly LH
      O106-17 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      • *1: w/ Power Tilt and Power Telescopic System

      • *2: w/ Seat Position Memory System

      • *3: for Triple Beam Headlight

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 10 CAN junction connector) D

    A

    REPLACE NO. 5 CAN JUNCTION CONNECTOR

    C

    GO TO STEP 29 Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 10 CAN JUNCTION CONNECTOR) Click here

    B

  13. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00731CC13
      *1 DLC3
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O1-9 (CANP) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O1-10 (CANN) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O1-9 (CANP) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O1-10 (CANN) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - NO. 5 CAN JUNCTION CONNECTOR)

  14. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 10 CAN JUNCTION CONNECTOR)


    1. Disconnect the T32 No. 10 CAN junction connector.

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

      B0076WSC01
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 10 CAN Junction Connector)

      		 *b to No. 5 CAN Junction Connector
      *c to Position Control ECU and Switch Assembly RH *d

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (w/ Seat Position Memory System)
      *e to No. 1 CAN Junction Terminal - -
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      T32-8 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 5 CAN junction connector
      T32-19 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T32-9 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly RH
      T32-20 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T32-10 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Outer mirror control ECU assembly (for front passenger side)*
      T32-21 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T32-11 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 1 CAN junction terminal
      T32-22 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T32-8 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 5 CAN junction connector
      T32-19 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T32-9 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly RH
      T32-20 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T32-10 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly (for front passenger side)*
      T32-21 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T32-11 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 1 CAN junction terminal
      T32-22 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      • *: w/ Seat Position Memory System

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (Line to No. 5 CAN junction connector) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 1 CAN junction terminal) D

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR)

    C

    GO TO STEP 29 Click here

    D

    GO TO STEP 30 Click here

  15. CHECK SUB BUS 1


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

    2. B0077LEC21
      *1 DLC3
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or more: Open circuit in main bus lines
      O1-9 (CANP) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O1-10 (CANN) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O1-9 (CANP) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O1-10 (CANN) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Result
      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus lines) B
      NG (Short circuit between bus lines) C

      • NG (Short to ground)

      • NG (+B short)

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 6 CAN JUNCTION CONNECTOR) Click here

    A

  16. 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 the main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from the 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) Click here

  17. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00777GC28
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  18. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O101 No. 1 CAN junction terminal connector.

    3. B0075JKC39
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O101-3 (CANH) - O101-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  19. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 6 CAN JUNCTION CONNECTOR)


    1. Reconnect the O101 No. 1 CAN junction terminal connector.

    2. Disconnect the O107 No. 6 CAN junction connector.

    3. B0073AMC24
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)
      *b to No. 16 CAN Junction Connector
      *c to Main Body ECU (Multiplex Network Body ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O107-2 (CANH) - O107-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 16 CAN junction connector
      O107-3 (CANH) - O107-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to No. 16 CAN junction connector) C

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

  20. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 16 CAN JUNCTION CONNECTOR)


    1. Reconnect the O107 No. 6 CAN junction connector.

    2. Disconnect the T37 No. 16 CAN junction connector.

    3. B0074FGC10
      *a

      Front view of wire harness connector

      (to No. 16 CAN Junction Connector)
      *b to No. 6 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T37-8 (CANH) - T37-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 CAN junction connector
      T37-11 (CANH) - T37-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (Line to No. 6 CAN junction connector) B
      NG (Line to No. 1 CAN junction terminal) C

    A

    REPLACE NO. 16 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

  21. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00777GC29
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  22. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O101 No. 1 CAN junction terminal connector.

    3. B0075JKC40
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O101-3 (CANH) - O101-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  23. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 6 CAN JUNCTION CONNECTOR)


    1. Reconnect the O101 No. 1 CAN junction terminal connector.

    2. Disconnect the O107 No. 6 CAN junction connector.

    3. B0073AMC25
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)
      *b

      to Multiplex Tilt and Telescopic ECU

      (w/ Power Tilt and Power Telescopic System)
      *c to No. 16 CAN Junction Connector
      *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (w/ Seat Position Memory System)
      *f

      to Headlight Light Control ECU Sub-assembly LH

      (for Triple Beam Headlight)
      *g to Position Control ECU and Switch Assembly LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O107-1 (CANH) - O107-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU*1
      O107-2 (CANH) - O107-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 16 CAN junction connector
      O107-3 (CANH) - O107-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      O107-4 (CANH) - O107-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly (for front passenger side)*2
      O107-5 (CANH) - O107-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Headlight light control ECU sub-assembly LH*3
      O107-6 (CANH) - O107-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly LH

      • *1: w/ Power Tilt and Power Telescopic System

      • *2: w/ Seat Position Memory System

      • *3: for Triple Beam Headlight

      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 16 CAN junction connector) D

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

    GO TO STEP 25 Click here

    D

  24. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 16 CAN JUNCTION CONNECTOR)


    1. Reconnect the O107 No. 6 CAN junction connector.

    2. Disconnect the T37 No. 16 CAN junction connector.

    3. B0074FGC11
      *a

      Front view of wire harness connector

      (to No. 16 CAN Junction Connector)
      *b to No. 6 CAN Junction Connector
      *c to Position Control ECU and Switch Assembly RH
      *d

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (w/ Seat Position Memory System)
      *e to No. 1 CAN Junction Terminal

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T37-8 (CANH) - T37-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 6 CAN junction connector
      T37-9 (CANH) - T37-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly RH
      T37-10 (CANH) - T37-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Outer mirror control ECU assembly (for driver side)*
      T37-11 (CANH) - T37-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction terminal

      • *: w/ Seat Position Memory System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 6 CAN junction connector) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 1 CAN junction terminal) D

    A

    REPLACE NO. 16 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR)

    D

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

    C

  25. CHECK FOR SHORT IN SUB BUS 1 LINES (ECU OR SENSOR)


    1. Reconnect all wire harness connectors.

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

      Click here

    3. B0073GCC16
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O1-9 (CANP) - O1-10 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      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 does not become normal when the connector is disconnected from the ECU or sensor, check for a short in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Result
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  26. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 6 CAN JUNCTION CONNECTOR)


    1. Disconnect the O107 No. 6 CAN junction connector.

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

      B0073HQC11
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)

      		 *b

      to Multiplex Tilt and Telescopic ECU

      (w/ Power Tilt and Power Telescopic System)
      *c to No. 16 CAN Junction Connector *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (w/ Seat Position Memory System)

      		 *f

      to Headlight Light Control ECU Sub-assembly LH

      (for Triple Beam Headlight)
      *g to Position Control ECU and Switch Assembly LH - -
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      O107-1 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Multiplex tilt and telescopic ECU*1
      O107-12 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-2 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 16 CAN junction connector
      O107-13 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-3 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Main body ECU (multiplex network body ECU)
      O107-14 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-4 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Outer mirror control ECU assembly (for front passenger side)*2
      O107-15 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-5 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Headlight light control ECU sub-assembly LH*3
      O107-16 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-6 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly LH
      O107-17 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O107-1 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Multiplex tilt and telescopic ECU*1
      O107-12 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O107-2 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 16 CAN junction connector
      O107-13 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O107-3 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Main body ECU (multiplex network body ECU)
      O107-14 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O107-4 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly (for front passenger side)*2
      O107-15 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O107-5 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Headlight light control ECU sub-assembly LH*3
      O107-16 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      O107-6 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly LH
      O107-17 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      • *1: w/ Power Tilt and Power Telescopic System

      • *2: w/ Seat Position Memory System

      • *3: for Triple Beam Headlight

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (Line to main body ECU (multiplex network body ECU)) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 16 CAN junction connector) D

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    C

    GO TO STEP 29 Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 16 CAN JUNCTION CONNECTOR) Click here

    B

  27. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

    2. B00731CC13
      *1 DLC3
      *a

      Front view of wire harness connector

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O1-9 (CANP) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O1-10 (CANN) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O1-9 (CANP) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O1-10 (CANN) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - NO. 6 CAN JUNCTION CONNECTOR)

  28. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 16 CAN JUNCTION CONNECTOR)


    1. Disconnect the T37 No. 16 CAN junction connector.

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

      B0076WSC34
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 16 CAN Junction Connector)

      		 *b to No. 6 CAN Junction Connector
      *c to Position Control ECU and Switch Assembly RH *d

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (w/ Seat Position Memory System)
      *e to No. 1 CAN Junction Terminal - -
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      T37-8 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 6 CAN junction connector
      T37-19 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T37-9 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly RH
      T37-20 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T37-10 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Outer mirror control ECU assembly (for driver side)*
      T37-21 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T37-11 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 1 CAN junction terminal
      T37-22 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      T37-8 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 6 CAN junction connector
      T37-19 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T37-9 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly RH
      T37-20 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T37-10 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly (for driver side)*
      T37-21 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      T37-11 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 1 CAN junction terminal
      T37-22 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      • *: w/ Seat Position Memory System

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (Line to No. 6 CAN junction connector) B
      NG (Line to ECU or sensor) C
      NG (Line to No. 1 CAN junction terminal) D

    A

    REPLACE NO. 16 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 16 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL) Click here

    C

  29. CHECK FOR SHORT IN SUB BUS 1 LINE (ECU OR SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B or shorted to GND is connected.

      Click here

    3. B0077LEC22
      *1 DLC3
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O1-9 (CANP) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O1-10 (CANN) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O1-9 (CANP) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O1-10 (CANN) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      • 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.

      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to ground in the wire harness and repair or replace the wire harness or connector if necessary.

      • 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 does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Result
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  30. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL)


    1. Disconnect the O101 No. 1 CAN junction terminal connector.

    2. B00751QC20
      *1 DLC3
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      O101-3 (CANH) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      O101-2 (CANL) - O8-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      O101-3 (CANH) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      O101-2 (CANL) - O8-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION TERMINAL - NO. 16 CAN JUNCTION CONNECTOR)