THEFT DETERRENT SYSTEM(w/ Entry and Start System) Security Horn Circuit

DESCRIPTION

When the theft deterrent system is operating, the certification ECU (smart key ECU assembly) outputs a signal continuously at 0.4 second intervals, causing the security horn to sound.

WIRING DIAGRAM

A01XAOUE01
*a from Battery
*b SECURITY
*c Certification ECU (Smart Key ECU Assembly)
*d Security Horn

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".

      Entry&Start
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn Security horn ON/OFF -
      OK
      Security horn operates normally.

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  2. INSPECT FUSE (SECURITY)


    1. Remove the SECURITY fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      SECURITY fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT SECURITY RELAY


    1. A01X7GPE24

      Remove the security 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

    NG

    REPLACE SECURITY RELAY

    OK

  4. INSPECT SECURITY HORN ASSEMBLY


    1. A01XBPNE01

      Remove the security horn Click 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

    NG

    REPLACE SECURITY HORN ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] AND SECURITY HORN)

    A01XADDE02
    *1 Front view of wire harness connector: (to Engine Room Relay Block)
    *2 Front view of wire harness connector: (to Certification ECU [Smart Key ECU Assembly])
    *3 Front view of wire harness connector: (to Security Horn)
    *4 Security Relay

    1. Remove the SECURITY relay from the engine room relay block.

    2. Disconnect the E30 ECU connector.

    3. Disconnect the A19 horn connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay block security relay terminal 1 - E30-20 (SH-) Always Below 1 Ω
      Relay block security relay terminal 3 - A19-1 Always Below 1 Ω
      E30-20 (SH-) Body ground Always 10 kΩ or higher
      A19-1 - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay block security relay terminal 2 - Body ground Always 11 to 14 V
      Relay block security relay terminal 5 - Body ground Always 11 to 14 V

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR