CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management1)

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 Lost communication with the gateway module (Power Management1).

  • V2 bus circuit

  • Headlight swivel ECU assembly (AFS ECU) branch wire or connector*1

  • Driving support ECU assembly branch wire or connector*2

  • Seat belt control ECU branch wire or connector*2

  • Power management control ECU main wire or connector

  • Headlight swivel ECU assembly (AFS ECU)*1

  • Driving support ECU assembly*2

  • Seat belt control ECU*2

  • Power management control ECU

  • CAN junction connector

WIRING DIAGRAM

A006WM9E02

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

    A006UO5E01
    Text in Illustration
    *1

    Component with harness connector

    (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      D75-26 (CA2H) - D75-25 (CA2L) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line
      Higher than 69 Ω: Open in CAN main bus line
      D75-26 (CA2H) - D75-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D75-25 (CA2L) - D75-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D75-26 (CA2H) - D75-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      D75-25 (CA2L) - D75-6 (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 (CAN JUNCTION CONNECTOR - HEADLIGHT SWIVEL ECU) Click here

    C

    CHECK HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND) Click here

    A

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

    A006UWRE01
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to CAN Junction Connector)

    1. Disconnect the D93 CAN junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D93-1 (CANH) - D93-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPAIR OR REPLACE CAN JUNCTION CONNECTOR

  4. CONNECT CONNECTOR


    1. Reconnect the D93 CAN junction connector.


    NEXT

  5. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A006V3VE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D75 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D75-26 (CA2H) - D75-25 (CA2L) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN JUNCTION CONNECTOR)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  6. CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - HEADLIGHT SWIVEL ECU)

    Note

    For vehicles without an adaptive front-lighting system, go to "Check for Short in CAN Bus Wires (CAN Junction Connector - Driving Support ECU)".


    1. A006VOGE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *2 Front view of DLC3

      Disconnect the D95 CAN junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D95-1 (CANH) - D95-2 (CANL) Ignition switch off 200 Ω or higher
      D95-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D95-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D95-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D95-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  7. CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - DRIVING SUPPORT ECU)

    Note

    For vehicles without a dynamic radar cruise control system, go to "Check for Short in CAN Bus Wires (CAN Junction Connector - Power Management Control ECU)".


    1. A006VOGE05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *2 Front view of DLC3

      Disconnect the D97 CAN junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D97-1 (CANH) - D97-2 (CANL) Ignition switch off 200 Ω or higher
      D97-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D97-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D97-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D97-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  8. CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - SEAT BELT CONTROL ECU)


    1. A006VOGE06
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *2 Front view of DLC3

      Disconnect the D96 CAN junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D96-1 (CANH) - D96-2 (CANL) Ignition switch off 200 Ω or higher
      D96-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D96-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D96-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D96-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  9. CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)


    1. A006VOGE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *2 Front view of DLC3

      Disconnect the D93 CAN junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D93-1 (CANH) - D93-2 (CANL) Ignition switch off 200 Ω or higher
      D93-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D93-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D93-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D93-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPAIR OR REPLACE CAN JUNCTION CONNECTOR

  10. CONNECT CONNECTOR


    1. Reconnect the D95 CAN junction connector connector.


    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRES (HEADLIGHT SWIVEL ECU)


    1. A006TP3E02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Headlight Swivel ECU Assembly)
      *2 Front view of DLC3

      Disconnect the A38 headlight swivel ECU assembly (AFS ECU) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A38-12 (CANH) - A38-13 (CANL) Ignition switch off 200 Ω or higher
      A38-12 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A38-13 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A38-12 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      A38-13 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE HEADLIGHT SWIVEL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

  12. CONNECT CONNECTOR


    1. Reconnect the D97 CAN junction connector connector.


    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU)


    1. A006VLHE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Driving Support ECU Assembly)
      *2 Front view of DLC3

      Disconnect the D14 driving support ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D14-39 (CA2H) - D14-17 (CA2L) Ignition switch off 200 Ω or higher
      D14-39 (CA2H) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D14-17 (CA2L) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D14-39 (CA2H) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D14-17 (CA2L) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE DRIVING SUPPORT ECU BRANCH WIRE OR CONNECTOR (CA2H, CA2L)

    A

    REPLACE DRIVING SUPPORT ECU ASSEMBLY Click here

  14. CONNECT CONNECTOR


    1. Reconnect the D96 CAN junction connector connector.


    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRES (SEAT BELT CONTROL ECU)


    1. Disconnect the A53*1 or D110*2 seat belt control ECU connector.


      • *1: for LHD

      • *2: for RHD

    2. A006WRIE01
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Rear view of wire harness connector

      (to Seat Belt Control ECU)
      *4 Front view of DLC3

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      A53-1 (CANH) - A53-2 (CANL) Ignition switch off 200 Ω or higher
      A53-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A53-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A53-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      A53-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      D110-1 (CANH) - D110-2 (CANL) Ignition switch off 200 Ω or higher
      D110-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D110-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D110-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D110-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE SETA BELT CONTROL ECU Click here

    C

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

    A

    REPLACE SEAT BELT CONTROL ECU Click here

  16. CONNECT CONNECTOR


    1. Reconnect the D93 CAN junction connector connector.


    NEXT

  17. CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)


    1. A006VI2E02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2 Front view of DLC3

      Disconnect the D75 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D75-26 (CA2H) - D75-25 (CA2L) Ignition switch off 200 Ω or higher
      D75-26 (CA2H) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D75-25 (CA2L) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D75-26 (CA2H) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D75-25 (CA2L) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - CAN JUNCTION CONNECTOR)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  18. CHECK HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY 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. A006UIJE04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D75 power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D75-5 (GND2) - Body ground Always Below 1 Ω
      D75-6 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D75-1 (AM22) - Body ground Always 11 to 14 V
      D75-2 (AM21) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here