CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

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

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U1002 The network gateway ECU does not receive signals from all ECUs that have been memorized as those connected to sub bus 2.

  • Open or short in sub bus 2 main lines or connector

  • Short in sub bus 2 branch lines or connector

  • Network gateway ECU

  • Rear television camera assembly*1

  • Blind spot monitor sensor RH*2

  • Open or short in CAN No. 6 junction connector

  • Open or short in CAN No. 7 junction connector

  • Open or short in CAN No. 8 junction connector

  • Open or short in CAN No. 9 junction connector

Tech Tips

This diagnosis procedure is for when DTC U1002 is output by the network gateway ECU (GTS display: Gateway).

WIRING DIAGRAM

A01EWJUE01

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the ignition 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 ignition 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.

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

  • DTC check procedure: Turn the ignition switch to ON, turn the blind spot monitor main switch on, wait at least 20 seconds and then drive the vehicle at a speed of 5 km/h (3 mph) or more for 6.2 seconds or more.

  • 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 ignition 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 2


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

    2. A01EX16E21
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I187-13 (CA2H) - I187-12 (CA2L) 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
      I187-13 (CA2H) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I187-12 (CA2L) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I187-13 (CA2H) - I187-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I187-12 (CA2L) - I187-2 (BATT) 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 (Ground short)

      • NG (+B short)

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU) Click here

    A

  2. RECONFIRM DTC OUTPUT


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

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Clear the DTCs.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON.

    8. Turn the GTS on.

    9. Enter the following menus: Body Electrical / Gateway / Trouble Codes.

      Result
      Result Proceed to

      DTC U1002 is output from network gateway ECU.

      (GTS display: Gateway)

      		 A

      DTC U1002 is not output from network gateway ECU.

      (GTS display: Gateway)

      		 B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

    REPLACE NETWORK GATEWAY ECU Click here

  3. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU)


    1. A01ET3VE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the I187 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I187-13 (CA2H) - I187-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 7 J/C) Click here

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  4. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 7 J/C)


    1. Reconnect the I187 network gateway ECU connector.

    2. A01ETY5E64
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *b to CAN No. 8 Junction Connector
      *c to CAN No. 6 Junction Connector

      Disconnect the O44 CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O44-8 (CANH) - O44-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 8 junction connector
      O44-11 (CANH) - O44-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 6 junction connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main bus lines) B
      NG (to CAN No. 6 junction connector main bus lines) C

    B

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 8 J/C) Click here

    C

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 6 J/C) Click here

    A

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 8 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. A01ETY5E62
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *b to CAN No. 9 Junction Connector
      *c to CAN No. 7 Junction Connector

      Disconnect the T21 CAN No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T21-9 (CANH) - T21-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 9 junction connector
      T21-11 (CANH) - T21-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 7 junction connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 9 junction connector main bus lines) B
      NG (to CAN No. 7 junction connector main bus lines) C

    B

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 9 J/C) Click here

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    A

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 9 J/C)


    1. Reconnect the T21 CAN No. 8 junction connector.

    2. A01EU9PE62
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 9 Junction Connector)

      Disconnect the T22 CAN No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T22-3 (CANH) - T22-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 8 J/C - CAN NO. 9 J/C)

    OK

    REPLACE CAN NO. 9 JUNCTION CONNECTOR

  7. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (CAN NO. 6 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. A01EXKLE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *b to CAN No. 7 Junction Connector
      *c to Network Gateway ECU

      Disconnect the I189 and I190 wire harness connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I190-1 (CANH) - I190-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 7 junction connector
      I189-1 (CANH) - I189-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Network gateway ECU
      Wiring Color
      Code

      Color

      CANH Side

      Color

      CANL Side

      		 Connected to
      I190 V LG CAN No. 7 junction connector
      I189 B LG Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main bus lines) B
      NG (to network gateway ECU main bus lines) C

      Note


      • Before disconnecting the connectors, make a note of where they are connected.

      • Reconnect each connector to its original position.


    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 6 J/C - NETWORK GATEWAY ECU)

    A

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  8. CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU)


    1. A01ET3VE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the I187 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I187-13 (CA2H) - I187-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 7 J/C) Click here

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  9. CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 7 J/C)


    1. Reconnect the I187 network gateway ECU connector.

    2. A01ETY5E63
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *b to CAN No. 8 Junction Connector
      *c

      to Blind Spot Monitor Sensor RH

      (w/ Blind Spot Monitor System)
      *d to CAN No. 6 Junction Connector

      Disconnect the O44 CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      O44-8 (CANH) - O44-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 8 junction connector
      O44-9 (CANH) - O44-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Blind spot monitor sensor RH*
      O44-11 (CANH) - O44-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 6 junction connector

      • *: w/ Blind Spot Monitor System

      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main bus lines) B
      NG (to CAN No. 6 junction connector main bus lines) C
      NG (to blind spot monitor sensor RH branch lines) D

    B

    CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 8 J/C) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 6 J/C) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR) Click here

    A

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

  10. CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 8 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. A01ETY5E65
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *b to CAN No. 9 Junction Connector
      *c

      to Rear Television Camera Assembly

      (for Radio and Display Type (w/ Parking Assist Monitor System without Parallel Parking Assist Function))
      *d to CAN No. 7 Junction Connector

      Disconnect the T21 CAN No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      T21-9 (CANH) - T21-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 9 junction connector
      T21-10 (CANH) - T21-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Rear television camera assembly*
      T21-11 (CANH) - T21-22 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 7 junction connector

      • *: for Radio and Display Type (w/ Parking Assist Monitor System without Parallel Parking Assist Function)

      Result
      Result Proceed to
      OK A
      NG (to CAN No. 9 junction connector main bus lines) B
      NG (to rear television camera assembly branch lines) C
      NG (to CAN No. 7 junction connector main bus lines) D

    B

    CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 9 J/C) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR) Click here

    D

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    A

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

  11. CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 9 J/C)


    1. Reconnect the T21 CAN No. 8 junction connector.

    2. A01EU9PE64
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 9 Junction Connector)

      Disconnect the T22 CAN No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T22-3 (CANH) - T22-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 8 J/C - CAN NO. 9 J/C)

    OK

    REPLACE CAN NO. 9 JUNCTION CONNECTOR

  12. CHECK FOR SHORT IN SUB BUS 2 LINES (CAN NO. 6 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. A01EXKLE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *b to CAN No. 7 Junction Connector
      *c to Network Gateway ECU

      Disconnect the I189 and I190 wire harness connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      I190-1 (CANH) - I190-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN No. 7 junction connector
      I189-1 (CANH) - I189-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Network gateway ECU
      Wiring Color
      Code

      Color

      CANH Side

      Color

      CANL Side

      		 Connected to
      I190 V LG CAN No. 7 junction connector
      I189 B LG Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main bus lines) B
      NG (to network gateway ECU main bus lines) C

      Note


      • Before disconnecting the connectors, make a note of where they are connected.

      • Reconnect each connector to its original position.


    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN NO. 6 J/C - NETWORK GATEWAY ECU)

    A

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  13. CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU)


    1. A01ET3VE60
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the I187 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I187-13 (CA2H) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I187-12 (CA2L) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I187-13 (CA2H) - I187-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I187-12 (CA2L) - I187-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

    NG

    CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 7 J/C) Click here

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  14. CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 7 J/C)


    1. Reconnect the I187 network gateway ECU connector.

    2. Disconnect the O44 CAN No. 7 junction connector.

      A01EVDCE19

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      O44-8 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 CAN No. 8 junction connector
      O44-19 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      O44-9 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 Blind spot monitor sensor RH*
      O44-20 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      O44-11 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 CAN No. 6 junction connector
      O44-22 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      O44-8 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 CAN No. 8 junction connector
      O44-19 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      O44-9 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 Blind spot monitor sensor RH*
      O44-20 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      O44-11 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 CAN No. 6 junction connector
      O44-22 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      • *: w/ Blind Spot Monitor System

      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)

      		 *b to CAN No. 8 Junction Connector
      *c

      to Blind Spot Monitor Sensor RH

      (w/ Blind Spot Monitor System)

      		 *d to CAN No. 6 Junction Connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main bus line) B
      NG (to CAN No. 6 junction connector main bus line) C
      NG (to blind spot monitor sensor RH branch 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.


    B

    CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 8 J/C) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 6 J/C) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR) Click here

    A

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

  15. CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 8 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. Disconnect the T21 CAN No. 8 junction connector.

      A01EVDCE20

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      T21-9 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 CAN No. 9 junction connector
      T21-20 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      T21-10 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 Rear television camera assembly*
      T21-21 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      T21-11 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 CAN No. 7 junction connector
      T21-22 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      T21-9 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 CAN No. 9 junction connector
      T21-20 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      T21-10 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 Rear television camera assembly*
      T21-21 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      T21-11 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 CAN No. 7 junction connector
      T21-22 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      • *: for Radio and Display Type (w/ Parking Assist Monitor System without Parallel Parking Assist Function)

      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)

      		 *b to CAN No. 9 Junction Connector
      *c

      to Rear Television Camera Assembly

      (for Radio and Display Type (w/ Parking Assist Monitor System without Parallel Parking Assist Function))

      		 *d to CAN No. 7 Junction Connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 9 junction connector main bus line) B
      NG (to rear television camera assembly branch line) C
      NG (to CAN No. 7 junction connector main 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.


    B

    CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 9 J/C) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR) Click here

    D

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    A

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

  16. CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 9 J/C)


    1. Reconnect the T21 CAN No. 8 junction connector.

    2. A01EZ1CE21
      Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to CAN No. 9 Junction Connector)

      Disconnect the T22 CAN No. 9 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      T22-3 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      T22-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      T22-3 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      T22-2 (CANL) - I39-16 (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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 8 J/C - CAN NO. 9 J/C)

    OK

    REPLACE CAN NO. 9 JUNCTION CONNECTOR

  17. CHECK FOR SHORT IN SUB BUS 2 LINE (CAN NO. 6 J/C)


    1. Reconnect the O44 CAN No. 7 junction connector.

    2. Disconnect the I189 and I190 wire harness connectors.

      A01ET0YE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      I190-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 CAN No. 7 junction connector
      I190-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I189-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short

      		 Network gateway ECU
      I189-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I190-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 CAN No. 7 junction connector
      I190-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      I189-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short

      		 Network gateway ECU
      I189-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *1 DLC3 - -
      *a

      Rear view of wire harness connector

      (to CAN No. 6 Junction Connector)

      		 *b to CAN No. 7 Junction Connector
      *c to Network Gateway ECU - -
      Wiring Color
      Code

      Color

      CANH Side

      Color

      CANL Side

      		 Connected to
      I190 V LG CAN No. 7 junction connector
      I189 B LG Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main bus line) B
      NG (to network gateway ECU main bus line) C

      Note


      • Before disconnecting the connectors, make a note of where they are connected.

      • Reconnect each connector to its original position.

      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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.


    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 6 J/C)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 6 J/C - NETWORK GATEWAY ECU)

    A

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  18. CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. A01EX16E24
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

      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
      I187-13 (CA2H) - I187-12 (CA2L) 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 shortcircuited branch line or connector.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  19. CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    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 Click here.

    3. A01EX16E25
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I187-13 (CA2H) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I187-12 (CA2L) - I187-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I187-13 (CA2H) - I187-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I187-12 (CA2L) - I187-2 (BATT) 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 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR