THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

The theft warning siren has an internal battery. If the vehicle auxiliary battery cable is disconnected or any of the communication lines are open, the theft warning siren detects this and sounds its siren.

Although the theft warning siren usually sounds by receiving a signal from the certification ECU, the theft warning siren can sound by its internal battery in case the vehicle auxiliary battery cable is disconnected.

The certification ECU sends an arming signal to the theft warning siren while transferring to the armed state, and it also sends a disarming signal to the siren while switching to the disarmed state. Also, the certification ECU can cause the theft warning siren to sound by sending an alarm signal during the alarm sounding state.

WIRING DIAGRAM

A000TSOE34
*a from Auxiliary Battery
*b CONT
*c Theft Warning Siren Assembly
*d Certification ECU

CAUTION / NOTICE / HINT

Note


  • If the certification ECU is replaced, refer to the Service Bulletin.

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SEQURITY HORN2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, perform the Active Test.

      Entry&Start
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn2 Theft warning siren OFF/ON -
      OK
      The theft warning siren assembly sounds and stops correctly when operated through the intelligent tester.

    OK

    REPLACE CERTIFICATION ECU

    NG

  2. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - BATTERY AND BODY GROUND)


    1. A000Y9RE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Theft Warning Siren Assembly)

      Disconnect the theft warning siren assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R84-5 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R84-2 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - CERTIFICATION ECU)


    1. Disconnect the R84 theft warning siren assembly connector.

    2. Disconnect the L16 certification ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R84-4 (CONT) - L16-7 (SSCL) Always Below 1 Ω
      R84-4 (CONT) or L16-7 (SSCL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK THEFT WARNING SIREN ASSEMBLY


    1. Temporarily replace the theft warning siren assembly with a new or normally functioning one Click here.

    2. Check the operation of the theft warning siren assembly function.

      OK
      Theft warning siren assembly function operates normally.

    OK

    END (THEFT WARNING SIREN ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU