CAN COMMUNICATION SYSTEM(for RHD) 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 "CAN Bus Check".

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

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  • Power source circuit of airbag ECU assembly

  • Airbag ECU assembly ground circuit

  • Airbag ECU assembly CAN branch wire or connector

  • Airbag ECU assembly

  • Instrument panel wire

WIRING DIAGRAM

A01XOLVE07
*1 No. 1 CAN Junction Connector
*2 A/BAG
*3 from IG2-MAIN Relay
*4 Airbag ECU Assembly

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 engine 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 engine 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 inspection procedure.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 20 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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  • The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS.

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Tech Tips


  • Operating the engine 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 (AIRBAG ECU ASSEMBLY BRANCH WIRE)


    1. B005AKUC05
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.

    2. Disconnect the airbag ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I58-13 (CANH) - I58-22 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (AIRBAG ECU ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01XO8PC06
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

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

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I58-21 (IG2) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I58-25 (E1) - Body ground Always Below 1 Ω
      I58-26 (E2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE