THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

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

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

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

WIRING DIAGRAM

B0024CJE06

CAUTION / NOTICE / HINT

Note


  • If the theft warning siren assembly is replaced, refer to the Service Bulletin.

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

  • w/ Door Control Battery:

    As the door control battery is installed between the vehicle battery and body ECU, first perform the inspections to confirm that there are no malfunctions in the power source circuit for the body ECU before performing this troubleshooting procedure.

    Click here

  • w/ Automatic Light Control System:

    If the body ECU has been replaced, it is necessary to initialize the body ECU.

    Click here

PROCEDURE


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


    1. B0025C8C08
      *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
      N16-3 (+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
      N16-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - BODY ECU)


    1. Disconnect the N16 theft warning siren assembly connector.

    2. Disconnect the G28 body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N16-2 (CONT) - G28-11 (SSCL) Always Below 1 Ω
      N16-2 (CONT) - Body ground Always 10 kΩ or higher
      G28-11 (SSCL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK THEFT WARNING SIREN ASSEMBLY


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

      Tech Tips

      Refer to the Service Bulletin.

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

      OK
      Theft warning siren assembly function operates normally.
      Result
      Proceed to
      OK
      NG (for LHD)
      NG (for RHD)

    OK

    END (THEFT WARNING SIREN ASSEMBLY WAS DEFECTIVE)

    NG (for LHD)

    REPLACE BODY ECU Click here

    NG (for RHD)

    REPLACE BODY ECU Click here