CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) 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 "Bus Check".

  • "Center Airbag Sensor Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside airbag sensor assembly

  • Center airbag sensor assembly branch wire or connector

  • Center airbag sensor assembly

WIRING DIAGRAM

A01VM24E08
*a No. 2 Junction Connector
*b from IG2 Relay
*c Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


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

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.

  • After the ignition switch is turned off, check that the key reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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 WIRE (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)


    1. A01VI4ME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the F16 center airbag sensor assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F16-13 (CANH) - F16-22 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01VKASE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Center Airbag Sensor Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F16-21 (IG2) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-25 (E1) - Body ground Always Below 1 Ω
      F16-26 (E2) - Body ground Always Below 1 Ω

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)