CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) Check Bus 5 Line for Short to +B

DTC Code DTC Name
Check Bus 5 Line for Short to +B

DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminal 15 (CA5H) of the central gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU and terminal 16 (BAT) of the DLC3.

Detection Item

Trouble Area

No resistance exists between terminal 15 (CA5H) of the central gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU and terminal 16 (BAT) of the DLC3.

  • Short to +B in bus 5 CAN main wires

  • Short to +B in bus 5 CAN branch wires

  • Central gateway ECU

  • Forward recognition camera*1

  • Millimeter wave radar sensor assembly*1

  • Driving support ECU assembly*1

  • Clearance warning ECU assembly*2

  • Parking assist ECU*3

  • Blind spot monitor sensor LH*4

  • Television camera assembly*5

  • No. 9 CAN junction connector

  • No. 10 CAN junction connector

*1: w/ Pre-crash Safety System

*2: w/ TOYOTA Parking Assist-sensor System (for 8 Sensor Type)

*3: w/ Panoramic View Monitor System

*4: w/ Blind Spot Monitor System

*5: w/ Parking Assist Monitor System (for Camera built-in ECU)

WIRING DIAGRAM

C334605E02
C334606E02
C334607E02

CAUTION / NOTICE / HINT

Note:

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

    Click here

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

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

    Click hereClick here

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

    Click hereClick here

Tip:

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

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

PROCEDURE

  1. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 9 CAN JUNCTION CONNECTOR)

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

      C280369C18

      *a

      Front view of wire harness connector

      (to No. 9 CAN Junction Connector)

      *b

      Front view of DLC3

      *c

      to Forward Recognition Camera (w/ Pre-crash Safety System)

      *d

      to Millimeter Wave Radar Sensor Assembly (w/ Pre-crash Safety System)

      *e

      to Driving Support ECU Assembly (w/ Pre-crash Safety System)

      *f

      to Central Gateway ECU

      *g

      to No. 10 CAN Junction Connector

      *h

      to Clearance Warning ECU Assembly (w/ TOYOTA Parking Assist-sensor System [for 8 Sensor Type])

    2. Disconnect the No. 9 CAN junction connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connect to

      G174-1 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Forward recognition camera*1

      G174-11 (CANL) - G14-16 (BAT)

      G174-2 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Millimeter wave radar sensor assembly*1

      G174-12 (CANL) - G14-16 (BAT)

      G174-3 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Driving support ECU assembly*1

      G174-13 (CANL) - G14-16 (BAT)

      G174-4 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Central gateway ECU

      G174-14 (CANL) - G14-16 (BAT)

      G174-5 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      No. 10 CAN junction connector

      G174-15 (CANL) - G14-16 (BAT)

      G174-6 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Clearance warning ECU assembly*2

      G174-16 (CANL) - G14-16 (BAT)

      *1: w/ Pre-crash Safety System

      *2: w/ TOYOTA Parking Assist-sensor System (for 8 Sensor Type)

    Result

    Result

    Result

    Proceed to

    OK

    A

    NG (No. 10 CAN junction connector CAN main wire)

    B

    NG (Central gateway ECU CAN main wire)

    C

    NG (ECU or sensor CAN branch wires)

    D
    A

    REPLACE NO. 9 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTORClick here

    D

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECU, SENSOR)Click here

    B

  2. CONNECT CONNECTOR

    1. Reconnect the G174 No. 9 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 10 CAN JUNCTION CONNECTOR)

    1. Disconnect the No. 10 CAN junction connector.

      C280369C19

      *a

      Front view of wire harness connector

      (to No. 10 CAN Junction Connector)

      *b

      Front view of DLC3

      *c

      to Parking Assist ECU (w/ Panoramic View Monitor System)

      *d

      to Central Gateway ECU

      *e

      to No. 9 CAN Junction Connector

      *f

      to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)

      *g

      to Television Camera Assembly (w/ Parking Assist Monitor System [for Camera built-in ECU])

      -

      -

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connect to

      N36-1 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Parking assist ECU*1

      N36-11 (CANL) - G14-16 (BAT)

      N36-2 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Central gateway ECU

      N36-12 (CANL) - G14-16 (BAT)

      N36-3 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      No. 9 CAN junction connector

      N36-13 (CANL) - G14-16 (BAT)

      N36-4 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Blind spot monitor sensor LH*2

      N36-14 (CANL) - G14-16 (BAT)

      N36-5 (CANH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      Television camera assembly*3

      N36-15 (CANL) - G14-16 (BAT)

      *1: w/ Panoramic View Monitor System

      *2: w/ Blind Spot Monitor System

      *3: w/ Parking Assist Monitor System (for Camera built-in ECU)

    Result

    Result

    Result

    Proceed to

    OK

    A

    NG (No. 9 CAN junction connector CAN main wire)

    B

    NG (Central gateway ECU CAN main wire)

    C

    NG (ECU or sensor CAN branch wires)

    D
    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECU, SENSOR)Click here

    C

  4. CONNECT CONNECTOR

    1. Reconnect the N36 No. 10 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTRAL GATEWAY ECU)

    1. C338146C26

      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      *b

      Front view of DLC3

      Disconnect the central gateway ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-9 (CAXH) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      G170-24 (CAXL) - G14-16 (BAT)

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU

    Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 10 CAN JUNCTION CONNECTOR)

  6. CONNECT CONNECTOR

    1. Reconnect the G174 No. 9 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  7. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTRAL GATEWAY ECU)

    1. C338146C27

      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      *b

      Front view of DLC3

      Disconnect the central gateway ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-15 (CA5H) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      G170-16 (CA5L) - G14-16 (BAT)

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU

    Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 9 CAN JUNCTION CONNECTOR)

  8. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECU, SENSOR)

    1. C334464C41

      *a

      Component with harness connected

      (Central Gateway ECU)

      *b

      Front view of DLC3

      Reconnect the CAN junction connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-15 (CA5H) - G14-16 (BAT)

      Cable disconnected from negative (-) battery terminal

      6 kΩ or higher

      G170-16 (CA5L) - G14-16 (BAT)
      Tip:

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

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BRANCH WIRES OR CONNECTOR