THEFT DETERRENT SYSTEM Security Horn Circuit

DTC Code DTC Name
Security Horn Circuit

DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the security horn assembly to sound.

WIRING DIAGRAM

B184350E06

INSPECTION PROCEDURE

Note:

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

      Click here

      Body Electrical > Main Body > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Security Horn

      Security Horn

      ON/OFF

      -

      OK

      Security horn operates normally.

      Result

      Result

      OK

      NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

  2. INSPECT S-HORN RELAY

    1. E145692N09

      Remove the S-HORN relay from the engine room relay block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage is not applied to terminals 1 and 2

      10 kΩ or higher

      3 - 5

      Battery voltage is applied to terminals 1 and 2

      Below 1 Ω

    Result

    Result

    OK

    NG
    NG

    REPLACE S-HORN RELAY

    OK

  3. INSPECT SECURITY HORN ASSEMBLY

    1. Remove the security horn.

      Click hereClick here

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

      OK

      Measurement Condition

      Specified Condition

      Battery positive (+) → Terminal 1

      Battery negative (-) → Horn bracket

      Horn sounds

      Result

      Result

      OK

      NG
    NG

    REPLACE SECURITY HORN ASSEMBLY

    Click hereClick here

    OK

  4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - MAIN BODY ECU, SECURITY HORN AND BATTERY)

    1. Remove the S-HORN relay from the engine room relay block.

    2. Remove the main body ECU.

      Click hereClick here

    3. Disconnect the A23 horn connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Relay block S-HORN relay terminal 1 - A-17 (SH)

      Always

      Below 1 Ω

      Relay block S-HORN relay terminal 3 - A23-1

      Always

      Below 1 Ω

      A-17 (SH) - Body ground

      Always

      10 kΩ or higher

      A23-1 - Body ground

      Always

      10 kΩ or higher

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      Relay block S-HORN relay terminal 2 - Body ground

      Always

      11 to 14 V

      Relay block S-HORN relay terminal 5 - Body ground

      Always

      11 to 14 V

    Result

    Result

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click hereClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR