THEFT DETERRENT SYSTEM, Diagnostic DTC:B2485

DTC Code DTC Name
B2485 Security Horn Circuit Transistor

DESCRIPTION

This DTC is output when one of the following occurs: 1) security horn is malfunctioning; 2) front controller is malfunctioning; or 3) the wire harness between the front controller and security horn is open or shorted.

DTC Code DTC Detection Condition Trouble Area
B2485 Security horn system malfunction

  • Security horn

  • Front controller

  • Harness or connector

WIRING DIAGRAM

A01GY8TE03

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECURITY HORN)


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

      Body No. 5
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn Security horn ON / OFF -
      OK
      Security horn operates normally.

    NG

    INSPECT SECURITY HORN ASSEMBLY Click here

    OK

    REPLACE FRONT CONTROLLER

  2. INSPECT SECURITY HORN ASSEMBLY


    1. A01GWQUE01

      for LHD:


      1. Remove the security horn Click here.

      2. Apply battery voltage and check the operation of the horn.

        OK
        Measurement Condition Specified Condition

        Battery positive (+) → Terminal 1

        Battery negative (-) → Horn bracket

        		 Horn sounds
    2. A01GWANE01

      for RHD:


      1. Remove the security horn Click here.

      2. Apply battery voltage and check the operation of the horn.

        OK
        Measurement Condition Specified Condition

        Battery positive (+) → Terminal 1

        Battery negative (-) → Horn bracket

        		 Horn sounds

    NG

    REPLACE SECURITY HORN ASSEMBLY

    OK

  3. CHECK HARNESS AND CONNECTOR (FRONT CONTROLLER - SECURITY HORN)


    1. A01GY53E02

      Disconnect the A52 front controller connector.

    2. Disconnect the A29 horn connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A52-4 (SH-) - A29-1 Always Below 1 Ω
      A52-4 (SH-) or A29-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT CONTROLLER