THEFT DETERRENT SYSTEM Tilt Sensor Circuit

DESCRIPTION

• The certification 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 certification ECU. The certification ECU checks whether the vehicle body is being tilted without authorization.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (TILT SENSOR)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the intelligent tester on.

   4. Enter the following menus: Body / Entry&Start / Data List.

   5. According to the display on the intelligent tester, read the Data List.

      Entry&Start

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Tilt sensor detection	Status of the tilt sensor detection / ON or OFF	ON: Tilt sensor detected OFF: Tilt sensor not detected	-

      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).

      OK
      The display on the intelligent tester changes according to the detection condition of the tilt sensor (yaw rate sensor).

   
   

   NG

   CHECK TILT SENSOR (YAW RATE SENSOR) (CSIF) Click here

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. CHECK TILT SENSOR (YAW RATE SENSOR) (CSIF)

   
   

   1. Using an oscilloscope, check the waveform.

      

      Text in Illustration

      *a	Component with harness connected (Certification 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

      Measurement Condition

      Tester Connection	Content
      Tester Connection	L16-21 (INCS) - 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) is normal, an initial response is output in response to the HI input from the certification ECU.

      • If the waveform output remains LO, there may be a problem with the certification ECU, as there is no input from the certification ECU.

      OK
      The waveform displays properly (HI is 6.5 V or higher and LO is below 1 V).

   
   

   NG

   REPLACE CERTIFICATION ECU

   OK

3. CHECK HARNESS AND CONNECTOR (TILT SENSOR [YAW RATE SENSOR] - CERTIFICATION ECU AND BODY GROUND)

   
   

   1. Disconnect the L71 tilt sensor (yaw rate sensor) connector.

   2. Disconnect the L16 certification ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition L71-5 (CSIF) - L16-21 (INCS) Always Below 1 Ω L71-1 (GND) - Body ground Always Below 1 Ω L71-5 (CSIF) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE TILT SENSOR (YAW RATE SENSOR) Click here