THEFT DETERRENT SYSTEM, Diagnostic DTC:B2769

DESCRIPTION

The tilt sensor (yaw rate and acceleration sensor) conducts self-diagnosis immediately after power is supplied to the sensor (when the theft deterrent system is set).

If a malfunction is detected in the CSIF line, the main body ECU (multiplex network body ECU) stores this DTC.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   CHECK HARNESS AND CONNECTOR (BATTERY - TILT SENSOR (YAW RATE AND ACCELERATION SENSOR) - BODY GROUND)

   
   
   1. 

      *a	Front view of wire harness connector (to Tilt Sensor (Yaw Rate and Acceleration Sensor))

      Disconnect the O81 tilt sensor (yaw rate and acceleration sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition O81-6 (+B) - Body ground Always 11 to 14 V

      Standard Resistance
      Tester Connection Condition Specified Condition O81-1 (GND) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

2. Click here

   CHECK TILT SENSOR (YAW RATE AND ACCELERATION SENSOR)

   
   

   1. Reconnect the O81 tilt sensor (yaw rate and acceleration sensor) connector.

   2. 

      *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

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content Tester Connection O1-6 (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)

      Tip:
      

      • 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
      Result Proceed to OK (There is an initial response) A NG (There is no initial response and the waveform output remains HI) B NG (Waveform output remains LO) C

   
   
   • A

     USE SIMULATION METHOD TO CHECKClick here

   • B

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

   • CClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (TILT SENSOR (YAW RATE AND ACCELERATION SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

   
   

   1. Disconnect the O1 main body ECU (multiplex network body ECU) connector.

   2. Disconnect the O81 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 O1-6 (GCS) - O81-5 (CSIF) Always Below 1 Ω O1-6 (GCS) or O81-5 (CSIF) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   
   • OK

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

   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR