TELEMATICS SYSTEM, Diagnostic DTC:B15C4

DTC Code DTC Name
B15C4 SRS Communication Error

DESCRIPTION

If the telephone transceiver assembly detects an error in communication between itself and the airbag ECU assembly as a result of a self check, this DTC will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B15C4 SRS Communication Error The telephone transceiver assembly detects an error in signals from the airbag ECU assembly when engine switch is on (IG).

  • Telephone transceiver assembly

  • Airbag ECU assembly

  • Harness or connector

  • Airbag system

WIRING DIAGRAM

B000YSYE37
*1 Airbag ECU Assembly
*2 Telephone Transceiver Assembly

CAUTION / NOTICE / HINT

Note


  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Registration for Telematics System.

    Click here

  • This vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

    Click here

  • After turning the engine 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

  • When replacing the telephone transceiver assembly, make sure to replace it with a new one.

PROCEDURE


  1. CHECK FOR DTC (AIRBAG SYSTEM)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG) and wait for 20 seconds.

    4. Turn the GTS on.

    5. Check if airbag system DTCs are output.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO AIRBAG SYSTEM Click here

    A

  2. CHECK TELEPHONE TRANSCEIVER ASSEMBLY


    1. B000XO0C31
      *a

      Component with harness connected

      (Telephone Transceiver Assembly)
      *b Waveform

      Check the output waveform.


      1. Remove the telephone transceiver assembly with the connector(s) still connected.

        Click here

      2. Connect an oscilloscope to terminal P48-24 (GSW) - Body ground.

      3. Turn the engine switch on (IG).

      4. Check the signal waveform according to thecondition(s) in the table below.

        Reference Waveform
        Item Condition
        Tester connection P48-24 (GSW) - Body ground
        Tool setting 5.0 V/DIV., 20 ms/DIV.
        Vehicle condition Engine switch on (IG)
        OK
        Waveform is as shown in the illustration.

        Tech Tips

        The oscilloscope waveform shown in the illustration is an example for reference only.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (TELEPHONE TRANSCEIVER ASSEMBLY - AIRBAG ECU ASSEMBLY) Click here

    OK

  3. REPLACE TELEPHONE TRANSCEIVER ASSEMBLY


    1. Replace the telephone transceiver assembly with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM REGISTRATION Click here

  4. CHECK HARNESS AND CONNECTOR (TELEPHONE TRANSCEIVER ASSEMBLY - AIRBAG ECU ASSEMBLY)


    1. Disconnect the P48 telephone transceiver assembly connector.

    2. Disconnect the P6 airbag ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P48-24 (GSW) - P6-23 (GSW3) Always Below 1 Ω
      P48-24 (GSW) or P6-23 (GSW3) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR