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

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

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
U1002 Network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 2*1 or sub bus 18*2.

  • Open or short in sub bus 2*1 or sub bus 18*2 main line or connector

  • Open or short in sub bus 2*1 or sub bus 18*2 branch line or connector

  • Network gateway ECU

  • Absorber control ECU*3

  • Clearance warning ECU assembly*4

  • Driving support ECU assembly*5

  • Seat belt control ECU*6

  • Blind spot monitor sensor RH*7

  • Open or short in No. 1 junction connector

  • Open or short in No. 2 junction connector

  • Open or short in No. 3 junction connector

  • Open or short in No. 4 junction connector

  • Open or short in No. 8 junction connector

WIRING DIAGRAM

A01FHQHE02
A01FF81E01

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.

  • 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 2*1 OR SUB BUS 18*2


    • *1: w/o Dynamic Rear Steering System

    • *2: w/ Dynamic Rear Steering System


    1. A01FGUOE02
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

      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
      N82-13 (CA2H) - N82-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      N82-13 (CA2H) - N82-12 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      N82-13 (CA2H) - N82-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N82-12 (CA2L) - N82-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      N82-13 (CA2H) - N82-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      N82-12 (CA2L) - N82-4 (GND) 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 (NETWORK GATEWAY ECU) Click here

    C

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

    D

    CHECK FOR SHORT IN CAN BUS LINE (NO. 1 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 network gateway ECU (GTS display / Gateway CAN*1 or Multi Bus Monitor 1*2) A
      Other DTC is output B

      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

    A

    REPLACE NETWORK GATEWAY ECU Click here

  3. CHECK FOR OPEN IN CAN BUS LINES (NETWORK GATEWAY ECU)


    1. A01FE5KE09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N82-13 (CA2H) - N82-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR) Click here

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR)


    1. A01FIKIE83
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b to Network Gateway ECU
      *c to No. 2 Junction Connector

      Reconnect the network gateway ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N132-7 (CANH) - N132-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-9 (CANH) - N132-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to Network gateway ECU main bus line) B
      NG (to No. 2 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)


    1. A01FIKIE84
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b to No. 3 Junction Connector
      *c to No. 1 Junction Connector

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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N134-8 (CANH) - N134-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-10 (CANH) - N134-21 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 3 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR)


    1. A01FIKIE85
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *b to No. 2 Junction Connector
      *c to No. 4 Junction Connector

      Reconnect the wire harness connector from the No. 2 junction connector.

    2. Disconnect the wire harness connector from the No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T46-7 (CANH) - T46-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      T46-8 (CANH) - T46-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

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

    A

    REPLACE NO. 3 JUNCTION CONNECTOR

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


    1. A01FIKIE55
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)
      *b to No. 3 Junction Connector
      *c to No. 8 Junction Connector

      Reconnect the wire harness connector from the No. 3 junction 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
      U54-2 (CANH) - U54-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-3 (CANH) - U54-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 3 junction connector main bus line) B
      NG (to No. 8 junction connector main bus line) C

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    C

    CHECK FOR OPEN IN CAN BUS LINES (NO. 8 JUNCTION CONNECTOR) Click here

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  8. CHECK FOR OPEN IN CAN BUS LINES (NO. 8 JUNCTION CONNECTOR)


    1. A01FDXIE46
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 8 Junction Connector)

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

    2. Disconnect the wire harness connector from the No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U55-3 (CANH) - U55-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 8 JUNCTION CONNECTOR

  9. CHECK FOR SHORT IN CAN BUS LINES (NETWORK GATEWAY ECU)


    1. A01FE5KE09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N82-13 (CA2H) - N82-12 (CA2L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (NO. 1 JUNCTION CONNECTOR) Click here

    OK

    REPLACE NETWORK GATEWAY ECU Click here

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


    1. A01FIKIE86
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b to Network Gateway ECU
      *c to No. 2 Junction Connector
      *d to Clearance Warning ECU Assembly

      Reconnect the network gateway ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N132-7 (CANH) - N132-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-9 (CANH) - N132-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N132-10 (CANH) - N132-21 (CANL)* Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *: w/ LEXUS Parking Assist-sensor System

      Result
      Result Proceed to
      OK A
      NG (to Network gateway ECU main bus line) B
      NG (to No. 2 junction connector main bus line) C
      NG (to Clearance warning ECU assembly branch bus line [w/ LEXUS Parking Assist-sensor System]) D

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  11. CHECK FOR SHORT IN CAN BUS LINES (NO. 2 JUNCTION CONNECTOR)


    1. A01FIKIE87
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b to No. 3 Junction Connector
      *c to Absorber Control ECU
      *d to No. 1 Junction Connector
      *e to Driving Support ECU Assembly

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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N134-8 (CANH) - N134-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-9 (CANH) - N134-20 (CANL)*1 Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N134-10 (CANH) - N134-21 (CANL)*2 Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N134-11 (CANH) - N134-22 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *1: w/ Adaptive Variable Suspension System

      • *2: w/ Dynamic Radar Cruise Control System

      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 3 junction connector main bus line) C
      NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System]) D
      NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control System])

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  12. CHECK FOR SHORT IN CAN BUS LINES (NO. 3 JUNCTION CONNECTOR)


    1. A01FIKIE88
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *b to No. 2 Junction Connector
      *c to No. 4 Junction Connector
      *d to Blind Spot Monitor Sensor RH

      Reconnect the wire harness connector from the No. 2 junction connector.

    2. Disconnect the wire harness connector from the No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T46-7 (CANH) - T46-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      T46-8 (CANH) - T46-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      T46-10 (CANH) - T46-21 (CANL)* Cable disconnected from negative (-) battery terminal 200 Ω or higher

      • *: w/ Blind Spot Monitor System

      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C
      NG (to Blind spot monitor sensor RH branch bus line [w/ Blind Spot Monitor System]) D

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

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

    D

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

    A

    REPLACE NO. 3 JUNCTION CONNECTOR

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


    1. A01FITFE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)
      *b to Seat Belt Control ECU
      *c to No. 3 Junction Connector
      *d to No. 8 Junction Connector

      Reconnect the wire harness connector from the No. 3 junction 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
      U54-1 (CANH) - U54-12 (CANL)* Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U54-2 (CANH) - U54-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      U54-3 (CANH) - U54-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      • *: w/ Pre-crash Safety System

      Result
      Result Proceed to
      OK A
      NG (to No. 3 junction connector main bus line) B
      NG (to No. 8 junction connector main bus line) C
      NG (to Seat belt control ECU branch bus line [w/ Pre-crash Safety System]) D

    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINES (NO. 8 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  14. CHECK FOR SHORT IN CAN BUS LINES (NO. 8 JUNCTION CONNECTOR)


    1. A01FDXIE46
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 8 Junction Connector)

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

    2. Disconnect the wire harness connector from the No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U55-3 (CANH) - U55-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 8 JUNCTION CONNECTOR

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


    1. A01FGUOE03
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

      Reconnect all wire harness connectors (No. 1 junction connector, No. 2 junction connector, No. 3 junction connector and No. 4 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
      N82-13 (CA2H) - N82-12 (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 short-circuited branch line or connector.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU

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


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

      A01FE57E19
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      		 *b Front view of DLC3
      *c to Network Gateway ECU *d to No. 2 Junction Connector
      *e to Clearance Warning ECU Assembly - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      N132-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Network gateway ECU
      N132-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-9 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 2 junction connector
      N132-20 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-10 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Clearance warning ECU assembly*
      N132-21 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N132-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Network gateway ECU
      N132-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-9 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 2 junction connector
      N132-20 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N132-10 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Clearance warning ECU assembly*2
      N132-21 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *: w/ LEXUS Parking Assist-sensor System

      Result
      Result Proceed to
      OK A
      NG (to Network gateway ECU main bus line) B
      NG (to No. 2 junction connector main bus line) C
      NG (to Clearance warning ECU assembly branch bus line [w/ LEXUS Parking Assist-sensor System]) 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*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    B

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

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 1 JUNCTION CONNECTOR

  17. CHECK FOR SHORT IN CAN BUS LINE (NETWORK GATEWAY ECU)


    1. A01FGSYE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway ECU)
      *b Front view of DLC3

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

    2. Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N82-13 (CA2H) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N82-12 (CA2L) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N82-13 (CA2H) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      N82-12 (CA2L) - 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 2*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 JUNCTION CONNECTOR)

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  18. CHECK FOR SHORT IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR)


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

      A01FE57E20
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 3 Junction Connector *d to Absorber Control ECU
      *e to No. 1 Junction Connector *f to Driving Support ECU Assembly

    2. Disconnect the wire harness connector from the No. 2 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
      N134-8 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 3 junction connector
      N134-19 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-9 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Absorber control ECU*1
      N134-20 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-10 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 1 junction connector
      N134-21 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-11 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Driving support ECU assembly*2
      N134-22 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      N134-8 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 3 junction connector
      N134-19 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-9 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Absorber control ECU*1
      N134-20 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-10 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 1 junction connector
      N134-21 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      N134-11 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Driving support ECU assembly*2
      N134-22 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *1: w/ Adaptive Variable Suspension System

      • *2: w/ Dynamic Radar Cruise Control System

      Result
      Result Proceed to
      OK A
      NG (to No. 1 junction connector main bus line) B
      NG (to No. 3 junction connector main bus line) C
      NG (to Absorber control ECU branch bus line [w/ Adaptive Variable Suspension System]) D
      NG (to Driving support ECU assembly branch bus line [w/ Dynamic Radar Cruise Control 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 2*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 2 JUNCTION CONNECTOR

  19. CHECK FOR SHORT IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR)


    1. Reconnect the wire harness connector from the No. 2 junction connector.

      A01FE57E21
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      		 *b Front view of DLC3
      *c to No. 2 Junction Connector *d to No. 4 Junction Connector
      *e to Blind Spot Monitor Sensor RH - -

    2. Disconnect the wire harness connector from the No. 3 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
      T46-7 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 2 junction connector
      T46-18 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      T46-8 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 4 junction connector
      T46-19 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      T46-10 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Blind spot monitor sensor RH*
      T46-21 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      T46-7 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 2 junction connector
      T46-18 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      T46-8 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 4 junction connector
      T46-19 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      T46-10 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Blind spot monitor sensor RH*
      T46-21 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *: w/ Blind Spot Monitor System

      Result
      Result Proceed to
      OK A
      NG (to No. 2 junction connector main bus line) B
      NG (to No. 4 junction connector main bus line) C
      NG (to Blind spot monitor sensor RH branch bus line [w/ Blind Spot Monitor System]) 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*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    C

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

    D

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

    A

    REPLACE NO. 3 JUNCTION CONNECTOR

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


    1. Reconnect the wire harness connector from the No. 3 junction connector.

      A01FE57E39
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

      		 *b Front view of DLC3
      *c to Seat Belt Control ECU *d to No. 3 Junction Connector
      *e to No. 8 Junction 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 Purpose Connected to
      U54-1 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short Seat belt control ECU*
      U54-12 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-2 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 3 junction connector
      U54-13 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANH ground short No. 8 junction connector
      U54-14 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Inspection for CANL ground short
      U54-1 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short Seat belt control ECU*
      U54-12 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-2 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 3 junction connector
      U54-13 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short
      U54-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANH +B short No. 8 junction connector
      U54-14 (CANL) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Inspection for CANL +B short

      • *: w/ Pre-crash Safety System

      Result
      Result Proceed to
      OK A
      NG (to No. 3 junction connector main bus line) B
      NG (to No. 8 junction connector main bus line) C
      NG (to Seat belt control ECU branch bus line [w/ Pre-crash Safety System]) 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*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    B

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN CAN BUS LINE (NO. 8 JUNCTION CONNECTOR) Click here

    D

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

    A

    REPLACE NO. 4 JUNCTION CONNECTOR

  21. CHECK FOR SHORT IN CAN BUS LINE (NO. 8 JUNCTION CONNECTOR)


    1. A01FIVUE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 8 Junction Connector)
      *b Front view of DLC3

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

    2. Disconnect the wire harness connector from the No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U55-3 (CANH) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U55-2 (CANL) - N20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      U55-3 (CANH) - N20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      U55-2 (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 2*1 or Sub Bus 18*2 inspection.


      • *1: w/o Dynamic Rear Steering System

      • *2: w/ Dynamic Rear Steering System


    NG

    REPAIR OR REPLACE CAN MAIN WIRE BUS LINE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 8 JUNCTION CONNECTOR

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


    1. A01FGUOE02
      Text in Illustration
      *a

      Component with harness connected

      (Network Gateway ECU)

      Reconnect all wire harness connectors (No. 1 junction connector, No. 2 junction connector, No. 3 junction connector and No. 4 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
      N82-13 (CA2H) - N82-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N82-12 (CA2L) - N82-4 (GND) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      N82-13 (CA2H) - N82-2 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      N82-12 (CA2L) - N82-2 (BATT) 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 2*1 or Sub Bus 18*2 inspection.

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


        • *1: w/o Dynamic Rear Steering System

        • *2: w/ Dynamic Rear Steering System


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU