CAN COMMUNICATION SYSTEM Center Airbag Sensor Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Center Airbag Sensor Communication Stop Mode

Either condition is met:


  • "Airbag" is not displayed on the "CAN Bus Check" screen of the GTS Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Center Airbag Sensor Communication Stop Mode" in "DTC Combination Table" Click here


  • Air bag ECU assembly branch line or connector

  • Power source circuit of air bag ECU assembly

  • Air bag ECU assembly ground circuit

  • Air bag ECU assembly

WIRING DIAGRAM

A004JV9E07
A004JV9E08

CAUTION / NOTICE / HINT

Note


  • 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 negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • 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 Click here.

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

  • DTC check procedure: Turn the ignition switch to ON and wait at least 60 seconds.

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

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 LINES (AIR BAG ECU ASSEMBLY BRANCH LINE)


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

    2. A004JAAE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Bag ECU Assembly)

      Disconnect the D27 air bag ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D27-13 (CANH) - D27-22 (CANL) Cable disconnected from negative (-) battery terminal 57 to 63 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (AIR BAG ECU ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A004KBSE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Bag ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D27-25 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
      D27-26 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. A004H8BE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Bag ECU Assembly)

      Connect the cable to the negative (-) battery terminal.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D27-21 (IG) - Body ground Ignition switch ON 11 to 14 V

    OK

    REPLACE AIR BAG ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)