THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the certification ECU (smart key ECU assembly) transmits a signal to cause the security horn assembly to sound.

WIRING DIAGRAM

A01CCGAE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Entry&Start / Active Test.

    5. Perform the Active Test according to the display on the tester.

      Entry&Start (Certification ECU (Smart Key ECU Assembly))
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn Security horn ON / OFF -
      OK
      The security horn assembly sounds and stops correctly when operated through the intelligent tester.

    NG

    INSPECT S/HORN RELAY Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. INSPECT S/HORN RELAY


    1. A01CBABE01
      Text in Illustration
      *a S/HORN Relay

      Remove the S/HORN relay from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Condition Specified Condition
      3 - 5

      10 kΩ or higher

      (when battery voltage is not applied between terminals 1 and 2)
      3 - 5

      Below 1 Ω

      (when battery voltage is applied between terminals 1 and 2)

    NG

    REPLACE S/HORN RELAY

    OK

  3. INSPECT SECURITY HORN ASSEMBLY


    1. A01CFXGE01
      Text in Illustration
      *a Security Horn Assembly

      Remove the security horn assembly Click here.

    2. Check the operation of the horn.

      Standard
      Measurement Condition Specified Condition
      Battery positive (+) → Terminal 1 Horn sounds
      Battery negative (-) → Horn body

    NG

    REPLACE SECURITY HORN ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (S/HORN RELAY - BATTERY)


    1. A01CF3PE01
      Text in Illustration
      *a No. 2 Engine Room Relay Block

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

      Standard Voltage
      Terminal Connection Condition Specified Condition
      Engine room relay block S/HORN relay terminal 5 - Body ground Always 11 to 14 V
      Engine room relay block S/HORN relay terminal 1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (S/HORN RELAY - SECURITY HORN ASSEMBLY)


    1. Disconnect the A37 security horn assembly connector.

    2. A01CF3PE01
      Text in Illustration
      *a No. 2 Engine Room Relay Block

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

      Standard Resistance
      Terminal Connection Condition Specified Condition
      Engine room relay block S/HORN relay terminal 3 - A37-1 Always Below 1 Ω
      Engine room relay block S/HORN relay terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (S/HORN RELAY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the G78 certification ECU (smart key ECU assembly) connector.

    2. A01CF3PE01
      Text in Illustration
      *a No. 2 Engine Room Relay Block

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

      Standard Resistance
      Terminal Connection Condition Specified Condition
      Engine room relay block S/HORN relay terminal 2 - G78-20 (SH-) Always Below 1 Ω
      Engine room relay block S/HORN relay terminal 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)