HORN SYSTEM, Diagnostic DTC:B2484

DTC Code DTC Name
B2484 Horn Circuit Transistor

DESCRIPTION

This DTC is output when one of the following occurs: 1) vehicle horn (high pitched or low pitched) is malfunctioning; 2) front light ECU (front controller) is malfunctioning; or 3) the wire harness between the front light ECU and vehicle horn is open or shorted.

DTC Code DTC Detection Condition Trouble Area
B2484 Horn system malfunction

  • High pitched horn

  • Low pitched horn

  • Front light ECU (Front controller)

  • Wire harness

WIRING DIAGRAM

A01GMRDE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HORN ASSEMBLY (OPERATION)


    1. Check if the horns sound normally.

      Result
      Result Proceed to
      One horn does not sound A
      Both horns do not sound B

      Tech Tips

      If both horns do not sound, there may be a malfunction in the front light ECU.


    B

    REPLACE FRONT LIGHT ECU

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (VEHICLE HORNS)


    1. Operate the intelligent tester according to the steps on the display and select "Active Test".


      1. Intelligent tester

        Body No.5
        Tester Display Test Part Control Range
        Horn Relay Vehicle horns ON / OFF
        OK
        Horn operates normally.

    NG

    INSPECT HORN ASSEMBLY Click here

    OK

    REPLACE FRONT LIGHT ECU

  3. INSPECT HORN ASSEMBLY

    A01GNCPE01

    1. Remove the horn for low pitched horn Click here or high pitched horn Click here.

    2. Check operation of the horn.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 1

      Battery negative (-) → Horn bracket

      		 Horn sounds

    NG

    REPLACE HORN ASSEMBLY

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT LIGHT ECU - HORN)

    A01GI34E03

    1. Disconnect the B14 ECU connector.

    2. Disconnect the B6*1 or B10*2 horn connector.

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

      Standard resistance
      for High pitched horn
      Tester Connection Condition Specified Condition
      B14-2 (HORH) - B6-1 Always Below 1 Ω
      B14-2 (HORH) or B6-1 - Body ground Always 10 kΩ or higher
      for Low pitched horn
      Tester Connection Condition Specified Condition
      B14-1 (HORL) - B10-1 Always Below 1 Ω
      B14-1 (HORL) or B10-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT LIGHT ECU