THEFT DETERRENT SYSTEM Tilt Sensor Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) operates the tilt sensor (yaw rate sensor) via the CSIF communication line. The tilt sensor (yaw rate sensor) sends information regarding changes in the vehicle tilt angle to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) checks whether the vehicle body is being tilted without authorization.

WIRING DIAGRAM

A01QT8HE01
*a from Battery
*b ECU-B NO.1
*c Tilt Sensor (Yaw Rate Sensor 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.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE


  1. READ VALUE USING GTS (TILT SENSOR)


    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. According to the display on the GTS, read the Data List.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Tilt Sensor Status of the tilt sensor detection ON or OFF

      ON: Tilt sensor detected

      OFF: Tilt sensor not detected

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Tilt Sensor

      Note

      After setting the theft deterrent system, wait 30 seconds or more (until the vehicle is in the armed state), tilt the vehicle and confirm the Data List (jack up the vehicle so that the tires are in the air).

      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) (w/ Entry and Start System).

      OK
      The display on the GTS changes according to the detection condition of the tilt sensor (yaw rate sensor assembly).
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK WAVEFORM (TILT SENSOR [YAW RATE SENSOR ASSEMBLY]) (CSIF)


    1. Using an oscilloscope, check the waveform.

      A01QSN9C05
      *a

      Component with harness connected

      (Main Body ECU [Multiplex Network Body ECU])

      		 *b CSIF Initial Signal
      *c CSIF 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
      *k HI *l LO
      Measurement Condition
      Tester Connection Content
      Tester Connection G79-6 (GCS) - 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 tilt sensor (yaw rate sensor assembly) 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
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (TILT SENSOR [YAW RATE SENSOR ASSEMBLY] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)


    1. Disconnect the N16 yaw rate sensor assembly connector.

    2. Disconnect the G79 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
      N16-5 (CSIF) - G79-6 (GCS) Always Below 1 Ω
      N16-1 (GND) - Body ground Always Below 1 Ω
      N16-5 (CSIF) - Body ground Always 10 kΩ or higher
      G79-6 (GCS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TILT SENSOR (YAW RATE SENSOR ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR