THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

The theft warning siren sounds if either of the following condition is met:


WIRING DIAGRAM

A0050BFE48
*a from Auxiliary Battery
*b CONT
*c Theft Warning Siren Assembly
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch to on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Main Body / Active Test.

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

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Test Part Control Range Diagnostic Note
      Security Horn2 Theft warning siren ON / OFF -
      OK
      The theft warning siren assembly sounds and stops correctly when operated using the intelligent tester.

    OK

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

    NG

  2. CHECK THEFT WARNING SIREN ASSEMBLY


    1. A004WWWE01
      Text in Illustration
      *a

      Component with harness connected

      (Theft Warning Siren Assembly)

      Remove the theft warning siren assembly with harness connected Click here.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q24-5 (+B) - Body ground Power switch off 11 to 14 V
      Q24-2 (GND) - Body ground Always Below 1 V
      Q24-4 (CONT) - Body ground When switched from armed state or arming preparation state to disarmed state (1) or disarmed state (2) (*1) Wave pattern (1) shown in chart below
      When switched from arming preparation state to armed state (*2) Wave pattern (2) shown in chart below
      Normal condition (Except (*1) and (*2)) 11 to 14 V

    3. Wave pattern

      A004X9OE09

    NG

    REPLACE THEFT WARNING SIREN ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - THEFT WARNING SIREN - BODY GROUND)


    1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the Q24 theft warning siren assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H17-18 (SSCL) - Q24-4 (CONT) Always Below 1 Ω
      H17-18 (SSCL) - Body ground Always 10 kΩ or higher
      Q24-2 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR