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)

  • No. 1 headlight ECU sub-assembly RH

  • Front multiplex network door ECU RH

  • Position control ECU assembly RH

  • Spoiler control ECU assembly*1

  • Position control ECU assembly LH

  • Front multiplex network door ECU LH

  • No. 1 headlight ECU sub-assembly LH

  • Main body ECU (multiplex network body ECU)

  • Certification ECU (smart key ECU assembly)

  • Multiplex tilt and telescopic ECU

  • Air conditioning amplifier assembly

  • Meter mirror sub-assembly*2

  • Combination meter assembly

  • No. 1 CAN CAN junction connector

  • No. 10 CAN CAN junction connector

  • No. 11 CAN CAN junction connector
*1: w/ Active Rear Wing
*2: w/ Headup Display System

WIRING DIAGRAM


  1. for LHD

    B000XSJE01
    B000YMVE01
    B000UB9E02

  2. for RHD

    B000WOTE01
    B000WAAE01
    *a No. 1 Headlight ECU Sub-assembly RH
    *b Position Control ECU Assembly RH
    *c Front Multiplex Network Door ECU RH
    *d No. 10 CAN Junction Connector
    B000UB9E02

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 engine 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 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 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 engine 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.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system.

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 (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)


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

    2. B000U8GC05
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P25-29 (CANH) - P25-30 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    C

    CONNECT CONNECTOR Click here

    B

  2. CONNECT CONNECTOR


    1. Reconnect the P25 combination meter assembly connector.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. B000VFDC17
      *a

      Front view of wire harness connector

      (to Central Gateway ECU [Network Gateway ECU])

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P59-15 (CA5H) - P59-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

  4. CONNECT CONNECTOR


    1. Reconnect the P59 central gateway ECU (network gateway ECU) connector.

      Result
      Proceed to
      NEXT

    NEXT

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

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 10 CAN junction connectors.

      B000XBDC02
      *1 No. 10 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 10 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X82 P W Front multiplex network door ECU RH
      X83 G W Position control ECU assembly RH
      X84 LG W No. 1 headlight ECU sub-assembly RH
      X85 R W No. 11 CAN junction connector
      X86 V W Central gateway ECU (network gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X82-1 (CANH) - X82-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front multiplex network door ECU RH
      X83-1 (CANH) - X83-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU assembly RH
      X84-1 (CANH) - X84-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly RH
      X85-1 (CANH) - X85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector
      X86-1 (CANH) - X86-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      Result
      Result Proceed to
      OK A
      NG (Central gateway ECU [network gateway ECU] CAN main wire) B
      NG (No. 11 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

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

    D

    GO TO STEP 18 Click here

    C

  6. CONNECT CONNECTOR


    1. Reconnect the No. 10 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 11 CAN junction connectors.

      B000YMUC12
      *1 No. 11 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 11 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X88 R W No. 10 CAN junction connector
      X89 G W Position control ECU assembly LH
      X90 P W Front multiplex network door ECU LH
      X91 GR W Spoiler control ECU assembly*
      X93 V W No. 1 CAN junction connector
      X94 LG W No. 1 headlight ECU sub-assembly LH

      *: w/ Active Rear Wing

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X88-1 (CANH) - X88-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      X89-1 (CANH) - X89-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU assembly LH
      X90-1 (CANH) - X90-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front multiplex network door ECU LH
      X91-1 (CANH) - X91-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spoiler control ECU assembly*
      X93-1 (CANH) - X93-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      X94-1 (CANH) - X94-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly LH
      *: w/ Active Rear Wing
      Result
      Result Proceed to
      OK A
      NG (No. 10 CAN junction connector CAN main wire) B
      NG (No. 1 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

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

    D

    GO TO STEP 18 Click here

    C

  8. CONNECT CONNECTOR


    1. Reconnect the No. 11 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. B000UFYC22
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to No. 11 CAN Junction Connector
      *c to Air Conditioning Amplifier Assembly
      *d to Meter Mirror Sub-assembly (w/ Headup Display System)
      *e to Combination Meter Assembly
      *f to Certification ECU (Smart Key ECU Assembly)
      *g to Multiplex Tilt and Telescopic ECU
      *h to Main Body ECU (Multiplex Network Body ECU)

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P107-1 (CANH) - P107-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector
      P107-2 (CANH) - P107-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      P107-3 (CANH) - P107-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Meter mirror sub-assembly*
      P107-4 (CANH) - P107-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      P107-5 (CANH) - P107-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
      P107-6 (CANH) - P107-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU
      P107-7 (CANH) - P107-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      *: w/ Headup Display System
      Result
      Result Proceed to
      OK A
      NG (No. 11 CAN junction connector CAN main wire) B
      NG (Combination meter assembly CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

    D

    GO TO STEP 18 Click here

  10. CONNECT CONNECTOR


    1. Reconnect the P25 combination meter assembly connector.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 11 CAN JUNCTION CONNECTOR)


    1. B000VFDC17
      *a

      Front view of wire harness connector

      (to Central Gateway ECU [Network Gateway ECU])

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P59-15 (CA5H) - P59-16 (CA5L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

  12. CONNECT CONNECTOR


    1. Reconnect the P59 central gateway ECU (network gateway ECU) connector.

      Result
      Proceed to
      NEXT

    NEXT

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

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 11 CAN junction connectors.

      B000YMUC25
      *1 No. 11 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 11 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X88 R W No. 10 CAN junction connector
      X89 G W Position control ECU assembly LH
      X90 P W Front multiplex network door ECU LH
      X91 GR W Spoiler control ECU assembly*
      X92 V W Central gateway ECU (network gateway ECU)
      X94 LG W No. 1 headlight ECU sub-assembly LH

      *: w/ Active Rear Wing

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X88-1 (CANH) - X88-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      X89-1 (CANH) - X89-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU assembly LH
      X90-1 (CANH) - X90-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front multiplex network door ECU LH
      X91-1 (CANH) - X91-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spoiler control ECU assembly*
      X92-1 (CANH) - X92-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      X94-1 (CANH) - X94-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly LH
      *: w/ Active Rear Wing
      Result
      Result Proceed to
      OK A
      NG (Central gateway ECU [network gateway ECU] 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

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU])

    D

    GO TO STEP 18 Click here

    C

  14. CONNECT CONNECTOR


    1. Reconnect the No. 11 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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

    Tech Tips


    • Before disconnecting the connectors, make a note of where it is connected.

    • Reconnect the connector to its original position.


    1. Disconnect the No. 10 CAN junction connectors.

      B000XBDC03
      *1 No. 10 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 10 CAN Junction Connector)

      		 - -
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connect to
      X82 P W Front multiplex network door ECU RH
      X83 G W Position control ECU assembly RH
      X84 LG W No. 1 headlight ECU sub-assembly RH
      X85 R W No. 11 CAN junction connector
      X87 V W No. 1 CAN junction connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      X82-1 (CANH) - X82-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Front multiplex network door ECU RH
      X83-1 (CANH) - X83-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU assembly RH
      X84-1 (CANH) - X84-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher No. 1 headlight ECU sub-assembly RH
      X85-1 (CANH) - X85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector
      X87-1 (CANH) - X87-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (No. 11 CAN junction connector CAN main wire) B
      NG (No. 1 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 10 CAN JUNCTION CONNECTOR

    B

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

    D

    GO TO STEP 18 Click here

    C

  16. CONNECT CONNECTOR


    1. Reconnect the No. 10 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the No. 1 CAN junction connector.

    2. B000UFYC22
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to No. 10 CAN Junction Connector
      *c to Air Conditioning Amplifier Assembly
      *d to Meter Mirror Sub-assembly (w/ Headup Display System)
      *e to Combination Meter Assembly
      *f to Certification ECU (Smart Key ECU Assembly)
      *g to Multiplex Tilt and Telescopic ECU
      *h to Main Body ECU (Multiplex Network Body ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P107-1 (CANH) - P107-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 10 CAN junction connector
      P107-2 (CANH) - P107-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air conditioning amplifier assembly
      P107-3 (CANH) - P107-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Meter mirror sub-assembly*
      P107-4 (CANH) - P107-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      P107-5 (CANH) - P107-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (smart key ECU assembly)
      P107-6 (CANH) - P107-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU
      P107-7 (CANH) - P107-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Main body ECU (multiplex network body ECU)
      *: w/ Headup Display System
      Result
      Result Proceed to
      OK A
      NG (No. 10 CAN junction connector CAN main wire) B
      NG (Combination meter assembly CAN main wire) C
      NG (Wire to ECU or sensor) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 10 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

    D

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


    1. B000XJRC11
      *a

      Component with harness connected

      (Central Gateway ECU [Network Gateway ECU])

      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 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
      P59-15 (CA5H) - P59-16 (CA5L) 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.

      Result
      Result
      OK
      NG

    OK

    REPLACE ECU OR SENSOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR