CAN COMMUNICATION SYSTEM (for RHD), Diagnostic DTC:U1002

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

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
U1002 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 line or connector

  • Open or short in sub bus 1 branch line or connector

  • Main body ECU (multiplex network body ECU)

  • Luggage closer motor assembly*1

  • Front multiplex network door ECU RH

  • Multiplex tilt and telescopic ECU

  • Position control ECU assembly RH*2

  • Power seat switch assembly*3

  • Position control ECU assembly LH*4

  • Front multiplex network door ECU LH

  • Open or short in No. 4 junction connector

  • Open or short in No. 5 junction connector

  • Open or short in No. 6 junction connector

  • Open or short in No. 10 junction connector

WIRING DIAGRAM

A01FF0AE01
A01FDD0E01

INSPECTION PROCEDURE

Note


  • 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, 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.

  • 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.

  • 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 notice before proceeding with work Click here.

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

  • 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 at least 20 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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. A01FHUQE18
      Text in Illustration
      *a

      Component with harness connected

      (No. 10 Junction Connector)
      *b Front view of DLC3

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition Resistance: Malfunction
      N135-3 (CANH) - N135-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      N135-3 (CANH) - N135-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      N135-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N135-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N135-3 (CANH) - N135-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      N135-2 (CANL) - N135-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU) Click here

    C

    CHECK FOR SHORT IN CAN BUS LINES (MAIN BODY ECU) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (NO. 4 JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Clear the DTCs.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG) check for DTCs.

      Result
      Result Proceed to
      U1002 is output from main body ECU (multiplex network body ECU) (GTS display / Main Body) A
      Other DTC is output B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

    A

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

  3. CHECK FOR OPEN IN CAN BUS LINES (MAIN BODY ECU)


    1. A01FGC5E02
      Text in Illustration
      *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
      N13-9 (CANP) - N13-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR) Click here

    OK

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

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


    1. A01FIKIE66
      Text in Illustration
      *a

      Rear view of wire harness connector

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

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

    2. Disconnect the wire harness connector from the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U54-20 (CANH) - U54-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-21 (CANH) - U54-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to Main body ECU [multiplex network body ECU] main bus line) B
      NG (to No. 5 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU)

    C

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

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

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


    1. A01FIKIE79
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 5 Junction Connector)
      *b to No. 4 Junction Connector
      *c to No. 6 Junction Connector

      Reconnect the wire harness connector from the No. 4 junction connector.

    2. Disconnect the wire harness connector from the No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N129-1 (CANH) - N129-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N129-3 (CANH) - N129-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 4 junction connector main bus line) B
      NG (to No. 6 junction connector main bus line) C

    B

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

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 6 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 5 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 6 JUNCTION CONNECTOR)


    1. A01FIKIE68
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 6 Junction Connector)
      *b to No. 5 Junction Connector
      *c to No. 10 Junction Connector

      Reconnect the wire harness connector from the No. 5 junction connector.

    2. Disconnect the wire harness connector from the No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N133-7 (CANH) - N133-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N133-10 (CANH) - N133-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 5 junction connector main bus line) B
      NG (to No. 10 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 10 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 6 JUNCTION CONNECTOR

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


    1. A01FDXIE36
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 10 Junction Connector)

      Reconnect the wire harness connector from the No. 6 junction connector.

    2. Disconnect the wire harness connector from the No. 10 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N135-3 (CANH) - N135-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 10 JUNCTION CONNECTOR - NO. 6 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 10 JUNCTION CONNECTOR

  8. CHECK FOR SHORT IN CAN BUS LINES (MAIN BODY ECU)


    1. A01FGC5E02
      Text in Illustration
      *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
      N13-9 (CANP) - N13-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR) Click here

    OK

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

  9. CHECK FOR SHORT IN CAN BUS LINES (NO. 4 JUNCTION CONNECTOR)


    1. A01FIKIE69
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)
      *b to Main Body ECU (Multiplex Network Body ECU)
      *c to No. 5 Junction Connector
      *d to Luggage Closer Motor Assembly

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

    2. Disconnect the wire harness connector from the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U54-20 (CANH) - U54-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-21 (CANH) - U54-10 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-22 (CANH) - U54-11 (CANL)* Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *: w/ Power Trunk Lid System

      Result
      Result Proceed to
      OK A
      NG (to Main body ECU [multiplex network body ECU] main bus line) B
      NG (to No. 5 junction connector main bus line) C
      NG (to Luggage closer motor assembly branch bus line) D

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - MAIN BODY ECU)

    C

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

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

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


    1. A01FIKIE80
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 5 Junction Connector)
      *b to No. 6 Junction Connector
      *c to Position Control ECU Assembly LH (for Luxury Seat Type)
      *d to No. 4 Junction Connector
      *e to Front Multiplex Network Door ECU LH

      Reconnect the wire harness connector from the No. 4 junction connector.

    2. Disconnect the wire harness connector from the No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N129-1 (CANH) - N129-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N129-2 (CANH) - N129-13 (CANL)* Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N129-3 (CANH) - N129-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N129-4 (CANH) - N129-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *: for Luxury Seat Type

      Result
      Result Proceed to
      OK A
      NG (to No. 4 junction connector main bus line) B
      NG (to No. 6 junction connector main bus line) C
      NG (to Front multiplex network door ECU LH branch bus line) D
      NG (to Power control ECU assembly LH branch bus line)

    B

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

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 6 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 5 JUNCTION CONNECTOR

  11. CHECK FOR SHORT IN CAN BUS LINES (NO. 6 JUNCTION CONNECTOR)


    1. A01FIKIE81
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 6 Junction Connector)
      *b to No. 5 Junction Connector
      *c to Multiplex Tilt and Telescopic ECU
      *d to Position Control ECU Assembly RH (except Standard Seat Type) or Power Seat Switch Assembly (for Standard Seat Type)
      *e to No. 10 Junction Connector
      *f to Front Multiplex Network Door ECU RH

      Reconnect the wire harness connector from the No. 5 junction connector.

    2. Disconnect the wire harness connector from the No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N133-7 (CANH) - N133-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N133-8 (CANH) - N133-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N133-9 (CANH) - N133-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N133-10 (CANH) - N133-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N133-11 (CANH) - N133-22 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Result
      Result Proceed to
      OK A
      NG (to No. 5 junction connector main bus line) B
      NG (to No. 10 junction connector main bus line) C
      NG (to Multiplex tilt and telescopic ECU branch bus line) D
      NG (to Power control ECU assembly RH [except Standard Seat Type] or power seat switch assembly [for Standard Seat Type] branch bus line)
      NG (to Front multiplex network door ECU RH branch bus line)

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 10 JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINES (ECUS) Click here

    A

    REPLACE NO. 6 JUNCTION CONNECTOR

  12. CHECK FOR SHORT IN CAN BUS LINES (NO. 10 JUNCTION CONNECTOR)


    1. A01FDXIE36
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 10 Junction Connector)

      Reconnect the wire harness connector from the No. 6 junction connector.

    2. Disconnect the wire harness connector from the No. 10 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N135-3 (CANH) - N135-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 10 JUNCTION CONNECTOR - NO. 6 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 10 JUNCTION CONNECTOR

  13. CHECK FOR SHORT IN CAN BUS LINES (ECUS)


    1. A01FDOPE02
      Text in Illustration
      *a

      Component with harness connected

      (No. 10 Junction Connector)

      Reconnect all wire harness connectors (No. 4 junction connector, No. 5 junction connector and No. 6 junction connector).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N135-3 (CANH) - N135-2 (CANL) 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 (between 54 and 69 Ω) when the connector is disconnected from the ECU (or sensor), repair or replace the short-circuited branch line or connector.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU

  14. CHECK FOR SHORT IN CAN BUS LINE (NO. 4 JUNCTION CONNECTOR)


    1. Disconnect the wire harness connector from the No. 4 junction connector.

      A01FE57E08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      		 *b Front view of DLC3
      *c to Main Body ECU (Multiplex Network Body ECU) *d to No. 5 Junction Connector
      *e to Luggage Closer Motor Assembly - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      U54-20 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Main body ECU (multiplex network body ECU)
      U54-9 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-21 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 5 junction connector
      U54-10 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-22 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Luggage closer motor assembly*
      U54-11 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-20 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Main body ECU (multiplex network body ECU)
      U54-9 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-21 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 5 junction connector
      U54-10 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-22 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Luggage closer motor assembly*
      U54-11 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *: w/ Power Trunk Lid System

      Result
      Result Proceed to
      OK A
      NG (to Main body ECU [multiplex network body ECU] main bus line) B
      NG (to No. 5 junction connector main bus line) C
      NG (to Luggage closer motor assembly branch bus line) D

      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.


    B

    CHECK FOR SHORT IN CAN BUS LINE (MAIN BODY ECU) Click here

    C

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

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  15. CHECK FOR SHORT IN CAN BUS LINE (MAIN BODY ECU)


    1. A01FI80E01
      Text in Illustration
      *a

      Rear view of wire harness connector

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

      Reconnect the wire harness connector from the No. 4 junction connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N13-9 (CANP) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N13-10 (CANN) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N13-9 (CANP) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      N13-10 (CANN) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      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.


    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (MAIN BODY ECU - NO. 4 JUNCTION CONNECTOR)

    OK

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

  16. CHECK FOR SHORT IN CAN BUS LINE (NO. 5 JUNCTION CONNECTOR)


    1. Reconnect the wire harness connector from the No. 4 junction connector.

      A01FE57E16
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 5 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 6 Junction Connector *d to Position Control ECU Assembly LH
      *e to No. 4 Junction Connector *f to Front Multiplex Network Door ECU LH

    2. Disconnect the wire harness connector from the No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      N129-1 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 6 junction connector
      N129-12 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N129-2 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Position control ECU assembly LH*
      N129-13 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N129-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 4 junction connector
      N129-14 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N129-4 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Front multiplex network body ECU LH
      N129-15 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N129-1 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 6 junction connector
      N129-12 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N129-2 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Position control ECU assembly LH*
      N129-13 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N129-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 4 junction connector
      N129-14 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N129-4 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Front multiplex network body ECU LH
      N129-15 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *: for Luxury Seat Type

      Result
      Result Proceed to
      OK A
      NG (to No. 4 junction connector main bus line) B
      NG (to No. 6 junction connector main bus line) C
      NG (to Power control ECU assembly LH branch bus line) D
      NG (to Front multiplex network door ECU LH branch bus line)

      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.


    B

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

    C

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

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 5 JUNCTION CONNECTOR

  17. CHECK FOR SHORT IN CAN BUS LINE (NO. 6 JUNCTION CONNECTOR)


    1. Reconnect the wire harness connector from the No. 5 junction connector.

      A01FE57E17
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 6 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 5 Junction Connector *d to Multiplex Tilt and Telescopic ECU
      *e to Position Control ECU Assembly RH (except Standard Seat Type) or Power Seat Switch Assembly (for Standard Seat Type) *f to No. 10 Junction Connector
      *g to Front Multiplex Network Door ECU RH - -

    2. Disconnect the wire harness connector from the No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      N133-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 5 junction connector
      N133-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N133-8 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Multiplex tilt and telescopic ECU
      N133-19 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N133-9 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Position control ECU assembly RH*1 or Power seat switch assembly*2
      N133-20 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N133-10 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 10 junction connector
      N133-21 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N133-11 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Front multiplex network door ECU RH
      N133-22 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N133-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 5 junction connector
      N133-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N133-8 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Multiplex tilt and telescopic ECU
      N133-19 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N133-9 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Position control ECU assembly RH*1 or Power seat switch assembly*2
      N133-20 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N133-10 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 10 junction connector
      N133-21 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N133-11 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Front multiplex network door ECU RH
      N133-22 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *1: except Standard Seat Type

      • *2: for Standard Seat Type

      Result
      Result Proceed to
      OK A
      NG (to No. 5 junction connector main bus line) B
      NG (to No. 10 junction connector main bus line) C
      NG (to Multiplex tilt and telescopic ECU branch bus line) D
      NG (to Power control ECU assembly RH [except Standard Seat Type] or power seat switch assembly [for Standard Seat Type] branch bus line)
      NG (to Front multiplex network door ECU RH branch bus line)

      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.


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    C

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

    D

    CHECK FOR SHORT IN CAN BUS LINE (ECUS) Click here

    A

    REPLACE NO. 6 JUNCTION CONNECTOR

  18. CHECK FOR SHORT IN CAN BUS LINE (NO. 10 JUNCTION CONNECTOR)


    1. A01FENVE11
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 10 Junction Connector)
      *b Front view of DLC3

      Reconnect the wire harness connector from the No. 6 junction connector.

    2. Disconnect the wire harness connector from the No. 10 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N135-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N135-2 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N135-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      N135-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      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.


    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 10 JUNCTION CONNECTOR - NO. 6 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 10 JUNCTION CONNECTOR

  19. CHECK FOR SHORT IN CAN BUS LINE (ECUS)


    1. A01FHUQE18
      Text in Illustration
      *a

      Component with harness connected

      (No. 10 Junction Connector)
      *b Front view of DLC3

      Reconnect all wire harness connectors (No. 4 junction connector, No. 5 junction connector and No. 6 junction connector).

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N135-3 (CANH) - N135-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N135-2 (CANL) - N135-1 (E) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N135-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      N135-2 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      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.

      • If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU