CAN COMMUNICATION SYSTEM Center Airbag Sensor Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Center Airbag Sensor Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the GTS.

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

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

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  • Airbag sensor assembly main line or connector

  • Power source circuit of airbag sensor assembly

  • Airbag sensor assembly ground circuit

  • Airbag sensor assembly

WIRING DIAGRAM

B006IBWE09
*1 No. 2 CAN Junction Connector
*2 from IG2-NO. 2 Relay
*3 Airbag Sensor 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 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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  • 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 at least approximately 61 seconds. Turn the cruise control main switch on, turn the lane departure alert main switch on and then drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds 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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  • Inspect the fuses for circuits related to this system before performing the following procedure.

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 LINES (AIRBAG SENSOR ASSEMBLY MAIN LINE)


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

    2. Disconnect the I59 airbag sensor assembly connector.

    3. B006HEWC07
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I59-13 (CANH) - I59-22 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (AIRBAG SENSOR ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B006HEWC08
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I59-25 (E1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      I59-26 (E2) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I59-21 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)