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, engine hood or luggage compartment door, or some other problem.

  If the automatic alarm 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, engine hood or luggage compartment door, or some other problem which would cause this to happen.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

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

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   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.

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

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Intrusion Sensor Sound Detect*1, *2	Sound detection status of the intrusion sensor (theft warning ultrasonic sensor) / 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.

      
      

      • *1: w/o Door Ajar Warning Buzzer Function

      Note

      
      

      • *2: Perform the intrusion sensor operation inspection with the GTS disconnected Click here.

      • Make sure all the windows are closed

      Tech Tips

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

      OK
      The GTS display changes correctly in response to the detection condition of the intrusion sensor (theft warning ultrasonic sensor).

   7. From inside the vehicle, put your hand in front of the sensor and move it back and forth a distance of 0.3 m (0.984 ft.) and check the Data List.

      Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Intrusion Sensor	Status of the intrusion sensor detection (theft warning ultrasonic sensor) / ON or OFF	ON: Intrusion sensor detected OFF: Intrusion sensor not detected	-

      Tech Tips

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

      OK
      The GTS display changes correctly in response to the detection condition of the intrusion sensor (theft warning ultrasonic sensor).

   
   

   OK

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

   NG

2. CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) (IOUT)

   
   

   1. Using an oscilloscope, check the waveform.

      

      Text in Illustration

      *a	Component with harness connected (Map Light Assembly)	*b	IOUT Initial Signal
      *c	IOUT Initial Response	*d	Approximately 1.0 seconds
      *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

      Tester Connection	Content
      Tester Connection	R12-1 (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 displays properly (HI is 6.5 V or higher and LO is below 1 V).

      Result

      Result	Proceed to
      OK	A
      NG (for LHD)	B
      NG (for RHD)	C

   
   

   B

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

   C

   REPLACE MAIN BODY ECU [MULTIPLEXNETWORK BODY ECU] Click here

   A

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEXNETWORK BODY ECU] - MAP LIGHT ASSEMBLY)

   
   

   1. Disconnect the E117 main body ECU (multiplex network body ECU) connector.

   2. Disconnect the R12 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition E117-12 (ISIF) - R12-1 (IOUT) Always Below 1 Ω E117-12 (ISIF) - Body ground Always 10 kΩ or higher R12-1 (IOUT) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. INSPECT MAP LIGHT ASSEMBLY

   
   

   1. Remove the map light assembly Click here.

   2. Remove the intrusion sensor (theft warning ultrasonic sensor) from the map light assembly Click here.

   3. 

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

      Standard Resistance
      Tester Connection Condition Specified Condition A-1 (GND9) -B-16 (GND9) Always Below 1 Ω A-2 (IOUT) -C-1 (IOUT) Always Below 1 Ω A-4 (+B3) - B-27 (+B3) Always Below 1 Ω

   
   

   OK

   REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

   NG

   REPLACE MAP LIGHT ASSEMBLY Click here