CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (MS Bus)

DESCRIPTION

If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).

DTC Code DTC Detection Condition Trouble Area
U1002 (CAN MS BUS) Lost communication with the gateway module (MS bus).

  • MS bus circuit

  • Main body ECU (instrument panel junction block assembly) main wire or connector

  • Multiplex tilt and telescopic ECU main wire or connector

  • Position control ECU assembly branch wire or connector*

  • Main body ECU (instrument panel junction block assembly)

  • Multiplex tilt and telescopic ECU

  • Position control ECU assembly*

  • No. 5 junction connector

WIRING DIAGRAM

A006T2OE02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

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

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  2. CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)


    1. A006WPRE01
      Text in Illustration
      *1

      Component with harness connected

      (Multiplex Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      D45-5 (CANP) - D45-14 (CANN) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line
      Ignition switch off Higher than 69 Ω: Open in CAN main bus line
      D45-5 (CANP) - D45-2 (+B) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D45-14 (CANN) - D45-2 (+B) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D45-5 (CANP) - D45-11 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      D45-14 (CANN) - D45-11 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to

      NG

      - Open in CAN main bus line

      		 A

      NG

      - Short in line

      - +B short

      - Ground short

      		 B
      OK C

    B

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - POSITION CONTROL ECU) Click here

    C

    CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR - POSITION CONTROL ECU) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 5 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)


    1. A006WW0E11
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Rear view of wire harness connector

      (to No. 5 Junction Connector)

      Disconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      G42-2 (CANH) - G42-13 (CANL) Ignition switch off 108 to 132 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      H21-2 (CANH) - H21-13 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 5 JUNCTION CONNECTOR - MAIN BODY ECU)

    A006WW0E04
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 5 Junction Connector)
    *2 for LHD
    *3 for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      G42-3 (CANH) - G42-14 (CANL) Ignition switch off 108 to 132 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      H21-3 (CANH) - H21-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPAIR OR REPLACE NO. 5 JUNCTION CONNECTOR

  5. CONNECT CONNECTOR


    1. Reconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD


    NEXT

  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MULTIPLEX TILT AND TELESCOPIC ECU - NO. 5 JUNCTION CONNECTOR)


    1. A006VA0E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)

      Disconnect the D45 multiplex tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D45-5 (CANP) - D45-14 (CANN) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MULTIPLEX TILT AND TELESCOPIC ECU (MULTIPLEX TILT AND TELESCOPIC ECU - NO. 5 JUNCTION CONNECTOR)

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  7. CONNECT CONNECTOR


    1. Reconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD


    NEXT

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU - NO. 5 JUNCTION CONNECTOR)

    A006VU7E01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the D80 main body ECU (instrument panel junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D80-3 (CANP) - D80-2 (CANN) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 5 JUNCTION CONNECTOR)

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - POSITION CONTROL ECU)

    Note

    For vehicles without a seat position memory system, go to "Check for Short in CAN Bus Wires (No. 5 Junction Connector - Multiplex Tilt and Telescopic ECU)".


    1. A006SQSE01
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Rear view of wire harness connector

      (to No. 5 Junction Connector)
      *4 Front view of DLC3

      Disconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      G42-1 (CANH) - G42-12 (CANL) Ignition switch off 200 Ω or higher
      G42-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-12 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      G42-12 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      H21-1 (CANH) - H21-12 (CANL) Ignition switch off 200 Ω or higher
      H21-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-12 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      H21-12 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - MULTIPLEX TILT AND TELESCOPIC ECU)

    A006SQSE04
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 5 Junction Connector)
    *2 Front view of DLC3
    *3 for LHD
    *4 for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      G42-2 (CANH) - G42-13 (CANL) Ignition switch off 108 to 132 Ω
      G42-2 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-13 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-2 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      G42-13 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      H21-2 (CANH) - H21-13 (CANL) Ignition switch off 108 to 132 Ω
      H21-2 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-13 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-2 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      H21-13 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR - MAIN BODY ECU)

    A006SQSE05
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 5 Junction Connector)
    *2 Front view of DLC3
    *3 for LHD
    *4 for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      G42-3 (CANH) - G42-14 (CANL) Ignition switch off 108 to 132 Ω
      G42-3 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-14 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      G42-3 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      G42-14 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      H21-3 (CANH) - H21-14 (CANL) Ignition switch off 108 to 132 Ω
      H21-3 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-14 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      H21-3 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      H21-14 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPAIR OR REPLACE NO. 5 JUNCTION CONNECTOR

  12. CONNECT CONNECTOR


    1. Reconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD


    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRES (POSITION CONTROL ECU)

    A006UT2E02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU Assembly)
    *4 Front view of DLC3

    1. Disconnect the O26*1 or O16*2 position control ECU assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      O26-40 (CANH) - O26-39 (CANL) Ignition switch off 200 Ω or higher
      O26-40 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      O26-39 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      O26-40 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      O26-39 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      O16-40 (CANH) - O16-39 (CANL) Ignition switch off 200 Ω or higher
      O16-40 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      O16-39 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      O16-40 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      O16-39 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE POSITION CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

  14. CONNECT CONNECTOR


    1. Reconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD


    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRES (MULTIPLEX TILT AND TELESCOPIC ECU)

    A006TCPE01
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to Multiplex Tilt and Telescopic ECU)
    *2 Front view of DLC3

    1. Disconnect the D45 multiplex tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D45-5 (CANP) - D45-14 (CANN) Ignition switch off 200 Ω or higher
      D45-5 (CANP) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D45-14 (CANN) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D45-5 (CANP) - D8-16 (BAT) Ignition switch off 200 Ω or higher
      D45-14 (CANN) - D8-16 (BAT) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE MULTIPLEX TILT AND TELESCOPIC ECU MAIN WIRE OR CONNECTOR (CANP, CANN)

    OK

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Click here

  16. CONNECT CONNECTOR


    1. Reconnect the G42*1 or H21*2 No. 5 junction connector connector.


      • *1: for LHD

      • *2: for RHD


    NEXT

  17. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)

    A006TDIE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU)
    *2 Front view of DLC3

    1. Disconnect the D80 main body ECU (instrument panel junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D80-3 (CANP) - D80-2 (CANN) Ignition switch off 200 Ω or higher
      D80-3 (CANP) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D80-2 (CANN) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D80-3 (CANP) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D80-2 (CANN) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE MAIN BODY ECU MAIN WIRE OR CONNECTOR (CANP, CANN)

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  18. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR - POSITION CONTROL ECU)

    A006VDYE01
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU Assembly)

    Note

    For vehicles without a seat position memory system, go to "Check Harness or Connector (Main Body ECU - Battery and Body Ground)".


    1. Disconnect the O26*1 or O16*2 position control ECU assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      O26-40 (CANH) - O26-39 (CANL) Ignition switch off 54 to 69 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      O16-40 (CANH) - O16-39 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POSITION CONTROL ECU (NO. 5 JUNCTION CONNECTOR - POSITION CONTROL ECU)

    OK

  19. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the D80, DB, DE, DF and DG main body ECU (instrument panel junction block assembly) connectors.

      A006VEVE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D80-4 (GND2) - Body ground Always Below 1 Ω
      DE-17 (GND1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DB-30 (BECU) - Body ground Always 11 to 14 V
      DG-1 (IG) - Body ground Always 11 to 14 V
      DF-5 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)