THEFT DETERRENT SYSTEM, Diagnostic DTC:B276A

DTC Code DTC Name
B276A Short to GND in Tilt Sensor Signal Circuit

DESCRIPTION

The yawrate sensor (theft warning tilt sensor) conducts self-diagnosis immediately after power is supplied to the sensor (when the theft deterrent system is set).

If short to ground is detected in the GCS line, the main body ECU (multiplex network body ECU) stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
B276A Short to GND in Tilt Sensor Signal Circuit

    After normal/trouble signal is output from Yawrate sensor (theft warning tilt sensor) as result of self-diagnosis, following malfunctions are detected:

  1. GCS line circuit is shorted to ground

  2. Reception of signals other than normal/trouble signal

  • Yawrate sensor (theft warning tilt sensor)

  • Main body ECU (Multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

B000X5ME03
*a from Battery
*b MPX-B D NO.2
*c Main Body ECU (Multiplex Network Body ECU)
*d Yawrate Sensor (Theft Warning Tilt Sensor)

CAUTION / NOTICE / HINT

Note


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

  • When replacing the yawrate sensor (theft warning tilt sensor), perform zero point calibration.

    Click here

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

PROCEDURE


  1. CHECK WAVEFORM (YAWRATE SENSOR [THEFT WARNING TILT SENSOR]) (CSIF)


    1. Using an oscilloscope, check the waveform.

      B000WS7C01
      *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 P9-15 (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 yawrate sensor (theft warning tilt 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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK YAWRATE SENSOR (THEFT WARNING TILT SENSOR)


    1. B000XQDC02
      *a

      Front view of wire harness connector

      (to Yawrate Sensor [Theft Warning Tilt Sensor])

      Disconnect the yawrate sensor (theft warning tilt sensor) connector.

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

      Measurement Condition
      Item Content
      Tester Connection P35-5 (CSIF) - P35-1 (GND)
      Condition Immediately after theft deterrent system is set
      Result
      Result Proceed to
      CSIF voltage is below 1 V when theft deterrent system is set A
      CSIF voltage is 6.5 V or higher when theft deterrent system is set B

    B

    REPLACE YAWRATE SENSOR (THEFT WARNING TILT SENSOR) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - YAWRATE SENSOR [THEFT WARNING TILT SENSOR])


    1. Disconnect the P9 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the P35 yawrate sensor (theft warning tilt sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P9-15 (GCS) - P35-5 (CSIF) Always Below 1 Ω
      P9-15 (GCS) or P35-5 (CSIF) - Other terminals and 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