TELEMATICS SYSTEM(for G-BOOK), Diagnostic DTC:B15C4

DTC Code DTC Name
B15C4 Airbag Signal Malfunction/Not Input

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
B15C4 Airbag Signal Malfunction/Not Input Airbag signal problem

  • Airbag system

  • Harness or connector

  • Airbag ECU assembly

  • Telephone transceiver assembly

WIRING DIAGRAM

B004B6WE12
*1 Airbag ECU Assembly
*2 Telephone Transceiver Assembly

CAUTION / NOTICE / HINT

Note


  • 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.

    Click here

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for G-BOOK.

    Click here

  • 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.

    Click here

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

PROCEDURE


  1. CHECK DTC OUTPUT (AIRBAG SYSTEM)


    1. Check for DTCs and check that no DTCs are output.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      No DTCs are output. A
      DTCs for airbag system are output. B

    B

    GO TO AIRBAG SYSTEM Click here

    A

  2. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    2. Recheck for DTCs and check if the same DTC is output again.

      Click here


      Body Electrical > Navigation System > Trouble Codes
      Result
      Result Proceed to
      B15C4 is not output. A
      B15C4 is output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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


    1. Disconnect the P134 telephone transceiver assembly connector.

    2. Disconnect the P6 airbag ECU assembly connector.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P134-24 (GSW) - P6-23 (GSW3) Always Below 1 Ω
      P134-24 (GSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AIRBAG ECU ASSEMBLY


    1. B004B2WC46
      *a

      Front view of wire harness connector

      (to Telephone Transceiver Assembly)

      Disconnect the telephone transceiver assembly connector.

    2. B004BXQE04

      Check the input waveform.


      1. Check the signal waveform according to the condition(s) in the table below. (Check the waveform from the back of the wire harness connector of the telephone transceiver assembly while the airbag ECU assembly connectors are connected.)

        Item Condition
        Tester Connection P134-24 (GSW) - Body ground
        Tool Setting 5.0 V/DIV., 20 ms./DIV.
        Vehicle Condition Power switch on (IG)
        OK
        The waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY Click here

    NG

  5. REPLACE AIRBAG ECU ASSEMBLY


    1. Replace the airbag ECU assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Navigation System > Clear DTCs

    2. Recheck for DTCs and check if the same DTC is output again.

      Click here


      Body Electrical > Navigation System > Trouble Codes
      Result
      Result Proceed to
      B15C4 is not output. A
      B15C4 is output. B

    A

    END (AIRBAG ECU ASSEMBLY IS DEFECTIVE)

    B

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY Click here