THEFT DETERRENT SYSTEM, Diagnostic DTC:B2769

DTC Code DTC Name
B2769 Tilt Sensor Signal Circuit Malfunction

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.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2769 Tilt Sensor Signal Circuit Malfunction

    After a normal/malfunction signal is output from the tilt sensor (yaw rate and acceleration sensor) as a result of self-diagnosis, the following malfunctions are detected:

  • Open in CSIF line circuit

  • Reception of signals other than normal/malfunction signal

  • Tilt sensor (Yaw rate and acceleration sensor)

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

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


    1. B003XPJC03
      *a

      Front view of wire harness connector

      (to Tilt Sensor (Yaw Rate and Acceleration Sensor))

      Disconnect the K85 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
      K85-6 (+B) - Body ground Power switch off 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      K85-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Reconnect the K85 tilt sensor (yaw rate and acceleration sensor) connector.

    2. 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
      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 CHECK Click here

    B

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

    C

  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 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR