CAN COMMUNICATION SYSTEM Check Bus 5 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

  • Short in CAN main bus wire

  • Short in CAN branch wire

  • Central gateway ECU (network gateway ECU)

  • Certification ECU (smart key ECU assembly)

  • Meter mirror Sub-assembly*1

  • Multiplex tilt and telescopic ECU

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

  • Headlight ECU sub-assembly LH

  • Front multiplex network door ECU LH

  • Position control ECU assembly

  • Front multiplex network door ECU RH

  • Rear power seat switch (rear multi operation panel)*2

  • No. 2 Position control ECU assembly

  • Headlight ECU sub-assembly RH

  • Combination meter assembly

  • No. 2 CAN junction connector

  • No. 10 CAN junction connector

  • No. 11 CAN junction connector
*1: w/ Headup Display System
*2: w/ Rear Multi Operation Panel System

WIRING DIAGRAM


  1. for LHD:

    B004Y10E01
    B004XOWE05

  2. for RHD:

    B004Y10E03
    B004XOWE06

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


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

    Click here

  • Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here

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

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

Tech Tips


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

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

PROCEDURE


  1. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 CAN JUNCTION CONNECTOR)


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

    2. Disconnect the L116 No. 11 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L116-1 (CANH) - L116-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 2 CAN junction connector
      L116-2 (CANH) - L116-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Front multiplex network door ECU LH
      L116-3 (CANH) - L116-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 10 CAN junction connector
      L116-4 (CANH) - L116-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • Position control ECU assembly*1

      • No. 2 Position control ECU assembly*2
      L116-5 (CANH) - L116-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Rear power seat switch (rear multi operation panel)*3
      L116-6 (CANH) - L116-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Headlight ECU sub-assembly RH
      *1: for LHD
      *2: for RHD
      *3: w/ Rear Multi Operation Panel System
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction connector CAN main wire) B
      NG (No. 10 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    C

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

    D

    GO TO STEP 8 Click here

    B

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


    1. Reconnect the L116 No. 11 CAN junction connector.

    2. Disconnect the G120 No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G120-11 (CANH) - G120-1 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      • Central gateway EUC (network gateway ECU)*1

      • Combination meter assembly*2
      G120-12 (CANH) - G120-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • Meter mirror Sub-assembly*3

      • Certification ECU (smart key ECU assembly)*2
      G120-13 (CANH) - G120-3 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • Certification ECU (smart key ECU assembly)*1

      • Meter mirror Sub-assembly*4
      G120-14 (CANH) - G120-4 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • Air conditioning amplifier assembly*1

      • Multiplex tilt and telescopic ECU*2
      G120-15 (CANH) - G120-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      G120-16 (CANH) - G120-6 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • Multiplex tilt and telescopic ECU*1

      • Air conditioning amplifier assembly*2
      G120-17 (CANH) - G120-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 11 CAN junction connector
      G120-18 (CANH) - G120-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Headlight ECU sub-assembly LH
      *1: for LHD
      *2: for RHD
      *3: for LHD with Headup Display System
      *4: for RHD with Headup Display System
      Result
      Result Proceed to
      OK A
      NG (Combination meter assembly CAN main wire) B
      NG (No. 11 CAN junction connector CAN main wire) C
      NG (Central gateway EUC [network gateway ECU] CAN main wire) D
      NG (Wire to ECU or sensor) E

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

    CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR) Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 2 CAN JUNCTION CONNECTOR) Click here

    E

    GO TO STEP 8 Click here

  3. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 CAN JUNCTION CONNECTOR)


    1. Reconnect the L116 No. 11 CAN junction connector.

    2. Disconnect the L115 No. 10 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L115-1 (CANH) - L115-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Front multiplex network door ECU RH
      L115-2 (CANH) - L115-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      • No. 2 Position control ECU assembly*1

      • Position control ECU assembly*2
      L115-3 (CANH) - L115-9 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

      • Central gateway EUC (network gateway ECU)*1

      • Combination meter assembly*2
      L115-4 (CANH) - L115-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 11 CAN junction connector
      *1: for LHD
      *2: for RHD
      Result
      Result Proceed to
      OK A
      NG (Central gateway EUC [network gateway ECU] CAN main wire) B
      NG (No. 11 CAN junction connector CAN main wire) C
      NG (Combination meter assembly CAN main wire) D
      NG (Wire to ECU or sensor) E

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

    CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 10 CAN JUNCTION CONNECTOR) Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - NO. 10 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 10 CAN JUNCTION CONNECTOR) Click here

    E

    CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR) Click here

  4. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the G120 No. 2 CAN junction connector.

    2. Disconnect the G34 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-29 (CANH) - G34-30 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)

  5. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 10 CAN JUNCTION CONNECTOR)


    1. Reconnect the L115 No. 10 CAN junction connector.

    2. Disconnect the G66 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G66-15 (CA5H) - G66-16 (CA5L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

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

  6. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 2 CAN JUNCTION CONNECTOR)


    1. Reconnect the L115 No. 10 CAN junction connector.

    2. Disconnect the G66 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G66-15 (CA5H) - G66-16 (CA5L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 2 CAN JUNCTION CONNECTOR)

  7. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY - NO. 10 CAN JUNCTION CONNECTOR)


    1. Reconnect the L115 No. 10 CAN junction connector.

    2. Disconnect the G34 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G34-29 (CANH) - G34-30 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 10 CAN JUNCTION CONNECTOR)

  8. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

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

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G66-15 (CA5H) - G66-16 (CA5L) Cable disconnected from negative (-) auxiliary 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.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR