THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

The theft warning siren has an internal auxiliary 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 main body ECU (multiplex network body ECU), the theft warning siren can sound by its internal auxiliary battery in case the vehicle auxiliary battery cable is disconnected.

The main body ECU (multiplex network body 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 main body ECU (multiplex network body ECU) can cause the theft warning siren to sound by sending an alarm signal during the alarm sounding state.

WIRING DIAGRAM

A01FR8KE07

INSPECTION PROCEDURE

Note


  • If the main body ECU (multiplex network body 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 GTS (SEQURITY HORN2)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, perform the Active Test.

      Main Body (Main Body ECU [Multiplex Network Body ECU])
      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 GTS.

    NG

    CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - AUXILIARY BATTERY AND BODY GROUND) Click here

    OK

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

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


    1. A01FRBSE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Theft Warning Siren Assembly)

      Disconnect the T36 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
      T36-5 (+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
      T36-2 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])


    1. Disconnect the T36 theft warning siren assembly connector.

    2. Disconnect the N13 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T36-4 (CONT) - N13-18 (SSCL) Always Below 1 Ω
      T36-4 (CONT) - 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.

    NG

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

    OK

    END (THEFT WARNING SIREN ASSEMBLY WAS DEFECTIVE)