CAN COMMUNICATION SYSTEM Certification ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptoms Trouble Area
Certification ECU Communication Stop Mode

Either condition is met:


  • "Entry & Start / Wireless Tuner" is not displayed on "Bus Check".

  • "Certification ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside certification ECU

  • Certification ECU branch wire or connector

  • Certification ECU

For vehicles w/ Entry and Start System.

WIRING DIAGRAM

A003CYOE01

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 or 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 the 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 OPEN IN CAN BUS WIRE (CERTIFICATION ECU BRANCH WIRE)

    A003B6FE01
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to Certification ECU)

    1. Disconnect the D54 certification ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D54-9 (CANH) - D54-10 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION 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. A003B6FE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Certification ECU)

      Disconnect the D54 certification ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D54-15 (E) - 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
      D54-1 (+B) - Body ground Always 11 to 14 V
      D54-16 (IG) - Body ground Ignition switch ON 11 to 14 V
      D54-17 (CUTB) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU