THEFT DETERRENT SYSTEM Intrusion Sensor Circuit

DESCRIPTION

If no warnings operate or the system can be set even though the conditions to set the system are not met, the main body ECU (multiplex network body ECU) cannot perform recognition due to a cutoff of the ON signal from the courtesy light switch from the doors or hood or some other problem.

If the theft deterrent system operates when it should not operate, it may be due to a false detection by the intrusion sensor (theft warning ultrasonic sensor) or due to the ON signal being input when there is a short circuit in the courtesy light switch of the doors or hood or some other problem which would cause this to happen.

Tech Tips

In the following situations, the intrusion sensor (theft warning ultrasonic sensor) may operate and cause the theft deterrent system to operate even when the sensor is normal.


  • The driver locks the doors and walks away from the vehicle while other people, pets, etc. are in the vehicle.

  • There are things which move easily inside the vehicle, such as things hanging inside the vehicle or clothing hanging from the coat hooks.

  • A window is open.

  • The vehicle is parked in a place with a lot of vibration or noise such as a parking garage.

  • The vehicle is being washed using a high-pressure spray gun or an automatic car wash.

  • The vehicle is continuously being struck or is vibrating due to hail or lightning.

  • The vehicle is continuously being subjected to impacts or is vibrating when snow or ice is being removed from the vehicle.

  • A frost prevention sheet which has an aluminum film is moved by wind, etc.

WIRING DIAGRAM

A005PZME03
*a from Battery
*b ECU-DCC NO. 2
*c Intrusion Sensor (Theft Warning Ultrasonic Sensor)
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

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

PROCEDURE


  1. READ VALUE USING GTS (INTRUSION SENSOR, INTRUSION SENSOR SOUND DETECT)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.

      Tech Tips

      When performing the above inspection, have the electrical key transmitter sub-assembly in the vehicle exterior detection area to perform certification (this prevents the alarm from sounding).

      Note

      Make sure that all windows are closed.

    6. Make a metal-on-metal striking sound (such as by shaking keys) near the intrusion sensor (theft warning ultrasonic sensor) and check the Data List.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Intrusion Sensor Sound Detect Sound detection status of the intrusion sensor (theft warning ultrasonic sensor)*1 ON or OFF

      ON: Sound detected

      OFF: Sound not detected

      		 Only displays "ON" on the Data List once. When checking again, disconnect and reconnect the GTS.

      Body Electrical > Main Body > Data List
      Tester Display
      Intrusion Sensor Sound Detect

      Note

      *1: Perform the intrusion sensor (theft warning ultrasonic sensor) operation inspection with the GTS disconnected.

      Click here

    7. From inside the vehicle, put your hand in front of the intrusion sensor (theft warning ultrasonic sensor) and move it back and forth a distance of 0.7 to 1 m (2.30 to 3.28 ft.) and check the Data List.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Intrusion Sensor Detection status of the intrusion sensor (theft warning ultrasonic sensor) ON or OFF

      ON: Intrusion detected

      OFF: Intrusion not detected

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Intrusion Sensor
      OK
      The GTS display changes correctly in response to the detection condition of the intrusion sensor (theft warning ultrasonic sensor).
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Using an oscilloscope, check the waveform.

      A005OOIC04
      *a

      Component with harness connected

      (Intrusion Sensor (Theft Warning Ultrasonic Sensor))

      		 *b IOUT Initial Signal
      *c IOUT Initial Response *d Approximately 1.0 Second
      *e Initial Diagnosis *f Approximately 1.0 to 1.6 Seconds
      *g Approximately 0.05 Seconds *h Approximately 5.5 Seconds
      *i Disarmed State *j Arming Preparation State
      Measurement Condition
      Item Content
      Tester Connection R10-2 (IOUT) - Body ground
      Tool Setting 2 V/DIV., 100 ms./DIV.
      Condition Theft deterrent system is set (system changes from disarmed state to arming preparation state)

      Tech Tips


      • If the intrusion sensor (theft warning ultrasonic sensor) is normal, an initial response is output in response to the HI input from the main body ECU (multiplex network body ECU).

      • If the waveform output remains LO, there may be a problem with the main body ECU (multiplex network body ECU), as there is no input from the main body ECU (multiplex network body ECU).

      OK
      The waveform is output properly (HI is 6.5 V or higher and LO is below 1 V).
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR))


    1. Disconnect the F16 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the R10 intrusion sensor (theft warning ultrasonic sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-12 (ISIF) - R10-2 (IOUT) Always Below 1 Ω
      F16-12 (ISIF) or R10-2 (IOUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR