CAN COMMUNICATION SYSTEM > Center Airbag Sensor Communication Stop Mode

for Preparation Click here


DESCRIPTION


Detection Item
Symptom
Trouble Area
Center Airbag Sensor Communication Stop Mode
Either condition is met:
  1. "Airbag" is not displayed on the CAN Bus Check screen of the GTS (Click here)
  2. Communication system DTCs (DTCs that start with U) that correspond to "Center Airbag Sensor Communication Stop Mode" in "DTC Combination Table" are output (Click here)
  1. Airbag sensor assembly branch line or connector
  2. Power source circuit of airbag sensor assembly
  3. Airbag sensor assembly ground circuit
  4. Airbag sensor assembly

WIRING DIAGRAM


C270071E03


C270072E03


INSPECTION PROCEDURE

NOTICE:
  1. 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 or any 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.
  2. 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).
  3. 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).
  4. After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
  5. DTC check procedure: Turn the ignition switch to ON, wait at least 10 seconds, and then drive the vehicle at a speed of 6 km/h (4 mph) or more for at least 3 seconds. Check that the warning light remains off after turning off following the initial light check.
  6. 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).

HINT:
  1. 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.
  2. 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.
1.CHECK FOR OPEN IN CAN BUS LINES (AIRBAG SENSOR ASSEMBLY BRANCH LINE)
  1. Disconnect the cable from the negative (-) battery terminal.



    C188243E95
  1. Disconnect the I47 airbag sensor assembly connector.

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

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    I47-13 (CANH) - I47-22 (CANL)
    Cable disconnected from negative (-) battery terminal
    54 to 69 Ω
    Text in Illustration 
    *a
    Front view of wire harness connector
    (to Airbag Sensor Assembly)


NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (AIRBAG SENSOR ASSEMBLY)
OK


2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    C188243E96
  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    I47-25 (E1) - Body ground
    Cable disconnected from negative (-) battery terminal
    Below 1 Ω
    I47-26 (E2) - Body ground
    Cable disconnected from negative (-) battery terminal
    Below 1 Ω
  1. Connect the cable to the negative (-) battery terminal.

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

    Standard Voltage:
    Tester Connection
    Condition
    Specified Condition
    I47-21 (IG2) - Body ground
    Ignition switch ON
    11 to 14 V
    Text in Illustration 
    *a
    Front view of wire harness connector
    (to Airbag Sensor Assembly)

    Result:
    Result
    Proceed to
    OK (for TMC, TMMR Made)
    A
    OK (for TMMK Made)
    B
    NG
    C


C
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

B
REPLACE AIRBAG SENSOR ASSEMBLY (for TMMK Made) (Click here)
A

REPLACE AIRBAG SENSOR ASSEMBLY (for TMC, TMMR Made) (Click here)