CAN COMMUNICATION SYSTEM Sub Battery Module Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Sub Battery Module Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Sub Battery Module" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication stop history for "Sub Battery Module" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Sub Battery Module" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Sub Battery Module Communication Stop Mode" in "DTC Combination Table" are output.

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  • Sub-battery with control assembly branch wire or connector

  • Power source circuit of sub-battery with control assembly

  • Sub-battery with control assembly ground circuit

  • Sub-battery with control assembly

WIRING DIAGRAM

B004C29E06

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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

  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

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Tech Tips


  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (SUB-BATTERY WITH CONTROL ASSEMBLY BRANCH WIRE)


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

    2. B004AJVC05
      *a

      Front view of wire harness connector

      (to Sub-battery with Control Assembly)

      Disconnect the sub-battery with control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      b5-3 (CANH) - b5-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the sub-battery with control assembly connector.

      B004C5QC02
      *a

      Front view of wire harness connector

      (to Sub-battery with Control Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      m1-1 (-BAT) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    3. Reconnect the cable to the negative (-) auxiliary battery terminal.

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      b5-7 (B) - Body ground Power switch off 11 to 14 V
      b5-14 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      Result
      Result
      OK
      NG

    OK

    REPLACE SUB-BATTERY WITH CONTROL ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR