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CAN COMMUNICATION SYSTEM Check Bus 5 Line for Short to +B

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

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

Symptom Trouble Area
There is no resistance between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

  • Short to +B in CAN main bus line

  • Short to +B in CAN branch line

  • Central gateway ECU (network gateway ECU)

  • Headlight ECU sub-assembly LH

    (w/ Automatic Headlight Beam Level Control System)

  • Headlight ECU sub-assembly RH

    (w/ Automatic Headlight Beam Level Control System)

  • Outer mirror control ECU assembly (for driver side)

    (w/ Seat Position Memory System)

  • Outer mirror control ECU assembly (for front passenger side)

    (w/ Seat Position Memory System)

  • Position control ECU assembly RH

    (w/ Seat Position Memory System)

  • Multiplex tilt and telescopic ECU

    (w/ Power Tilt and Power Telescopic System)

  • Air conditioning amplifier assembly

  • Certification ECU (smart key ECU assembly)

    (w/ Smart Entry and Start System)

  • Main body ECU (multiplex network body ECU)

  • Combination meter assembly

  • Meter mirror sub-assembly

    (w/ Headup Display System)

  • No. 3 CAN junction connector

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 5 junction connector

    (for RHD)

  • No. 6 junction connector

    (for LHD)
B006ZV1E04
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WIRING DIAGRAM

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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.

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  • 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.

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

    DTC check procedure: Turn the ignition switch to ON 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.

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  • Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Service Bulletin.

Tip:

  • 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.

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PROCEDURE


  1. Click here

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


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

    2. Disconnect the K126 No. 3 CAN junction connector.

    3. B006YJMC89
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 3 CAN Junction Connector)

      		 *b to No. 1 Junction Connector
      *c

      to Certification ECU (Smart Key ECU Assembly)

      (w/ Smart Entry and Start System)

      		 *d to Combination Meter Assembly
      *e to Main Body ECU (Multiplex Network Body ECU) *f to Air Conditioning Amplifier Assembly
      *g

      to Headlight ECU Sub-assembly LH

      (w/ Automatic Headlight Beam Level Control System)

      		 *h

      to Meter Mirror Sub-assembly

      (w/ Headup Display System)
      *i

      to Multiplex Tilt and Telescopic ECU

      (w/ Power Tilt and Power Telescopic System)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      K126-3 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 1 junction connector
      K126-14 (CANL) - K68-16 (BAT)
      K126-4 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Certification ECU (smart key ECU assembly)*1
      K126-15 (CANL) - K68-16 (BAT)
      K126-5 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Combination meter assembly
      K126-16 (CANL) - K68-16 (BAT)
      K126-6 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Main body ECU (multiplex network body ECU)
      K126-17 (CANL) - K68-16 (BAT)
      K126-7 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Air conditioning amplifier assembly
      K126-18 (CANL) - K68-16 (BAT)
      K126-8 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Headlight ECU sub-assembly LH*2
      K126-19 (CANL) - K68-16 (BAT)
      K126-9 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Meter mirror sub-assembly*3
      K126-20 (CANL) - K68-16 (BAT)
      K126-10 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Multiplex tilt and telescopic ECU*4
      K126-21 (CANL) - K68-16 (BAT)

      • *1: w/ Smart Entry and Start System

      • *2: w/ Automatic Headlight Beam Level Control System

      • *3: w/ Headup Display System

      • *4: w/ Power Tilt and Power Telescopic System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 junction connector) B
      NG (Line to ECU or sensor) C

  2. Click here

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


    1. Disconnect the R94 No. 1 junction connector.

    2. B006ZW3C18
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 1 Junction Connector)

      		 *b

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (w/ Seat Position Memory System)
      *c to No. 3 CAN Junction Connector *d

      to No. 5 Junction Connector

      (for RHD)
      *e

      to No. 6 Junction Connector

      (for LHD)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R94-1 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Outer mirror control ECU assembly (for front passenger side)*1
      R94-12 (CANL) - K68-16 (BAT)
      R94-3 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 3 CAN junction connector
      R94-14 (CANL) - K68-16 (BAT)
      R94-4 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 5 junction connector*2
      R94-15 (CANL) - K68-16 (BAT)
      R94-4 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 6 junction connector*3
      R94-15 (CANL) - K68-16 (BAT)

      • *1: w/ Seat Position Memory System

      • *2: for RHD

      • *3: for LHD

      Result
      Result Proceed to
      OK A
      NG (Line to No. 3 CAN junction connector) B
      NG (Line to No. 5 junction connector (for RHD)) C
      NG (Line to No. 6 junction connector (for LHD)) D
      NG (Line to ECU or sensor) E

    • A

      REPLACE NO. 1 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 3 CAN JUNCTION CONNECTOR)

    • CClick here
    • DClick here
    • EClick here

      GO TO STEP 7

  3. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 5 JUNCTION CONNECTOR)


    1. Disconnect the R100 No. 5 junction connector.

    2. B006ZW3C21
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 5 Junction Connector)

      		 *b to No. 2 Junction Connector
      *c to No. 1 Junction Connector *d

      to Position Control ECU Assembly RH

      (w/ Seat Position Memory System)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R100-5 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 2 junction connector
      R100-16 (CANL) - K68-16 (BAT)
      R100-6 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 1 junction connector
      R100-17 (CANL) - K68-16 (BAT)
      R100-7 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Position control ECU assembly RH*
      R100-18 (CANL) - K68-16 (BAT)

      • *: w/ Seat Position Memory System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 junction connector) B
      NG (Line to No. 2 junction connector) C
      NG (Line to ECU or sensor) D

    • A

      REPLACE NO. 5 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    • CClick here

      GO TO STEP 5

    • DClick here

      GO TO STEP 7

  4. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 6 JUNCTION CONNECTOR)


    1. Disconnect the R101 No. 6 junction connector.

    2. B006ZW3C23
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 6 Junction Connector)

      		 *b to No. 2 Junction Connector
      *c to No. 1 Junction Connector - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R101-1 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 2 junction connector
      R101-12 (CANL) - K68-16 (BAT)
      R101-2 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 1 junction connector
      R101-13 (CANL) - K68-16 (BAT)
      Result
      Result Proceed to
      OK A
      NG (Line to No. 1 junction connector) B
      NG (Line to No. 2 junction connector) C

    • A

      REPLACE NO. 6 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    • CClick here
  5. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR)


    1. Disconnect the R97 No. 2 junction connector.

    2. B006ZW3C26
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 2 Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c

      to No. 5 Junction Connector

      (for RHD)

      		 *d

      to No. 6 Junction Connector

      (for LHD)
      *e

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (w/ Seat Position Memory System)

      		 *f

      to Headlight ECU Sub-assembly RH

      (w/ Automatic Headlight Beam Level Control System)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R97-1 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (network gateway ECU)
      R97-12 (CANL) - K68-16 (BAT)
      R97-2 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 5 junction connector*1
      R97-13 (CANL) - K68-16 (BAT)
      R97-2 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher No. 6 junction connector*2
      R97-13 (CANL) - K68-16 (BAT)
      R97-3 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Outer mirror control ECU assembly (for driver side)*3
      R97-14 (CANL) - K68-16 (BAT)
      R97-5 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Headlight ECU sub-assembly RH*4
      R97-16 (CANL) - K68-16 (BAT)

      • *1: for RHD

      • *2: for LHD

      • *3: w/ Seat Position Memory System

      • *4: w/ Automatic Headlight Beam Level Control System

      Result
      Result Proceed to
      OK A
      NG (Line to No. 5 junction connector (for RHD)) B
      NG (Line to No. 6 junction connector (for LHD)) C
      NG (Line to central gateway ECU (network gateway ECU)) D
      NG (Line to ECU or sensor) E

    • A

      REPLACE NO. 2 JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

    • C

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 6 JUNCTION CONNECTOR)

    • DClick here
    • EClick here
  6. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


    1. Disconnect the K76 central gateway ECU (network gateway ECU) connector.

    2. B006YJMC31
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 2 Junction Connector)

      		 *b to Central Gateway ECU (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R97-1 (CANH) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      R97-12 (CANL) - K68-16 (BAT)
      Result
      Result
      OK
      NG

    • OK

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • NG

      REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

  7. Click here

    CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR 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 bus line shorted to +B is connected.

      Click here

    3. B006YHYC17
      *1 DLC3 - -
      *a

      Component with harness connected

      (Central Gateway ECU (Network Gateway ECU))

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K76-15 (CA5H) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      K76-16 (CA5L) - K68-16 (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.

      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Result
      OK
      NG

    • OK

      REPLACE ECU OR SENSOR

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR