CAN COMMUNICATION SYSTEM(for RHD) Power Back Door ECU Communication Stop Mode

DESCRIPTION

Detection Item Detection Item Trouble Area
Power Back Door ECU Communication Stop Mode

Either condition is met:


  • "Back Door" is not displayed on the "CAN Bus Check".

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Power Back Door ECU Communication Stop Mode" in "DTC Combination Table".

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  • Power source circuit of multiplex network door ECU

  • Multiplex network door ECU ground circuit

  • Multiplex network door ECU CAN branch wire or connector

  • Multiplex network door ECU

WIRING DIAGRAM

Figure 1. w/ Power Back Door System:

B003R50E08

Figure 2. w/o Power Back Door System:

B003R50E15

CAUTION / NOTICE / HINT

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, 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 battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

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

  • DTC check procedure: Turn the ignition switch ON and wait at least 2.2 seconds.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

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Tech Tips


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

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (MULTIPLEX NETWORK DOOR ECU CAN BRANCH WIRE)


    1. B003POJC23
      *A w/ Power Back Door System
      *B w/o Power Back Door System
      *a

      Rear view of wire harness connector

      (to Multiplex Network Door ECU)

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

    2. Disconnect the multiplex network door ECU connector.

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

      Standard Resistance
      w/ Power Back Door System:
      Tester Connection Condition Specified Condition
      V12-13 (CANP) - V12-14 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      w/o Power Back Door System:
      Tester Connection Condition Specified Condition
      V25-13 (CANP) - V25-14 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MULTIPLEX NETWORK DOOR ECU CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

    OK

  2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND)


    1. B003JXIC13
      *A w/ Power Back Door System
      *B w/o Power Back Door System
      *a

      Rear view of wire harness connector

      (to Multiplex Network Door ECU)

      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 multiplex network door ECU connector.

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

      Standard Voltage
      w/ Power Back Door System:
      Tester Connection Condition Specified Condition
      V12-1 (ECUB) - Body ground Always 11 to 14 V
      V13-8 (B) - Body ground Always 11 to 14 V
      V12-7 (IG) - Body ground Ignition switch ON 11 to 14 V
      w/o Power Back Door System:
      Tester Connection Condition Specified Condition
      V25-1 (ECUB) - Body ground Always 11 to 14 V
      V26-8 (B) - Body ground Always 11 to 14 V
      V25-7 (IG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      w/ Power Back Door System:
      Tester Connection Condition Specified Condition
      V13-7 (GND) - Body ground Always Below 1 Ω
      w/o Power Back Door System:
      Tester Connection Condition Specified Condition
      V26-7 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR