THEFT DETERRENT SYSTEM Tilt Sensor Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) communicates with the tilt sensor (yaw rate and acceleration sensor) via the CSIF communication line. The tilt sensor (yaw rate and acceleration 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.

Tech Tips

In the following situations, the tilt sensor (yaw rate and acceleration sensor) may operate and cause the theft deterrent system to operate even when the sensor is normal.


  • The vehicle is transported by a ferry, trailer or train.

  • The vehicle is parked in a multi-story parking facility.

  • The vehicle is washed by a conveyor type car washing machine.

  • A tire blows out.

  • The vehicle is jacked up for a tire or wheel change.

  • An earthquake occurs or the road subsides.

  • Goods such as skis or snowboards are loaded or unloaded.

WIRING DIAGRAM

B003YQNE02
*a from Auxiliary Battery
*b MPX-B NO. 2
*c Tilt Sensor (Yaw Rate and Acceleration Sensor)
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

  • When replacing the tilt sensor (yaw rate and acceleration sensor), perform zero point calibration.

    Click here

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

PROCEDURE


  1. READ VALUE USING GTS (TILT SENSOR)


    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 / Data List.

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

      Note

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

      Click here


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Tilt Sensor Detection status of the tilt sensor (yaw rate and acceleration sensor) ON or OFF

      ON: Change in pitch angle detected

      OFF: Change in pitch angle not detected

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Tilt Sensor
      OK
      The GTS display changes correctly in response to the detection condition of the tilt sensor (yaw rate and acceleration sensor).
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK TILT SENSOR (YAW RATE AND ACCELERATION SENSOR)


    1. Using an oscilloscope, check the waveform.

      B003XOOC04
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

      		 *b CSIF Initial Signal
      *c CSIF 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 K1-6 (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 and acceleration 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 (TILT SENSOR (YAW RATE AND ACCELERATION SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the K85 tilt sensor (yaw rate and acceleration sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K1-6 (GCS) - K85-5 (CSIF) Always Below 1 Ω
      K1-6 (GCS) - Body ground Always 10 kΩ or higher
      K85-5 (CSIF) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TILT SENSOR (YAW RATE AND ACCELERATION SENSOR) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR