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 (V2 bus).

  • V2 bus circuit

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

  • Power management control ECU main wire or connector

  • Headlight swivel ECU assembly (AFS ECU)*

  • Power management control ECU

  • CAN junction connector

WIRING DIAGRAM

A00DRHHE04

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)

    A00DTZ0E13
    Text in Illustration
    *1

    Component with harness connected

    (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
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line
      Higher than 69 Ω: Open in CAN main bus line
      D109-26 (CA2H) - D109-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-25 (CA2L) - D109-1 (AM22) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-26 (CA2H) - D109-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      D109-25 (CA2L) - D109-6 (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 AND 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)

    A00DPM3E01
    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 connector.


    NEXT

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


    1. A00DSOVE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D109 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
      D109-26 (CA2H) - D109-25 (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 - Power Management Control ECU)".


    1. A00DTLNE01
      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 - POWER MANAGEMENT CONTROL ECU)


    1. A00DTLNE02
      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 108 to 132 Ω
      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

  8. CONNECT CONNECTOR


    1. Reconnect the D95 CAN junction connector connector.


    NEXT

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


    1. A00DSU2E02
      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

  10. CONNECT CONNECTOR


    1. Reconnect the D93 CAN junction connector connector.


    NEXT

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


    1. A00DUBIE03
      Text in Illustration
      *1

      Rear view of wire harness connector

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

      Disconnect the D109 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
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 108 to 132 Ω
      D109-26 (CA2H) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-25 (CA2L) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-26 (CA2H) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D109-25 (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

  12. CHECK HARNESS AND 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. A00DU8TE51
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D109 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D109-5 (GND2) - Body ground Always Below 1 Ω
      D109-6 (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
      D109-1 (AM22) - Body ground Always 11 to 14 V
      D109-2 (AM21) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here