THEFT DETERRENT SYSTEM(w/ Entry and Start System), Diagnostic DTC:B276A

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

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B276A Terminal CSIF of theft warning tilt sensor (yaw rate sensor) has not received signal for 5 seconds or more

  • Theft warning tilt sensor (yaw rate sensor)

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

A01X2JPE22
*a from Battery
*b J/B-B NO.2
*c Theft Warning Tilt Sensor (Yaw Rate 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 the Service Bulletin.

  • When replacing the theft warning tilt sensor (yaw rate sensor), perform zero point calibration Click here.

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

  • w/ Door Control Battery:

    As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure Click here.

PROCEDURE


  1. CHECK THEFT WARNING TILT SENSOR (YAW RATE SENSOR) (CSIF)


    1. Using an oscilloscope, check the waveform.

      A01X977E01
      Text in Illustration
      *a

      Component with harness connected

      (Main body ECU [multiplex network body 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 E117-6 (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 theft warning tilt sensor (yaw rate 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 displays properly (HI is 6.5 V or higher and LO is below 1 V).

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    1. A01X4BJE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Theft Warning Tilt Sensor [Yaw Rate Sensor])

      Disconnect the theft warning tilt sensor (yaw rate sensor) connector.

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

      Standard Voltage
      Tester Connection Condition
      E50-5 (CSIF) - E50-1 (GND) Immediately after theft deterrent system 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

      Tech Tips

      With connector E50 of the theft warning tilt sensor (yaw rate sensor) disconnected, measure the voltage at CSIF when the theft deterrent system is set.


    B

    REPLACE THEFT WARNING TILT SENSOR (YAW RATE SENSOR) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEXNETWORK BODY ECU] - THEFT WARNING TILT SENSOR [YAW RATE SENSOR])


    1. Disconnect the E117 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the E50 theft warning tilt sensor (yaw rate sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E117-6 (GCS) - E50-5 (CSIF) Always Below 1 Ω
      E117-6 (GCS) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE MAIN BODY ECU (MULTIPLEXNETWORK BODY ECU) Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEXNETWORK BODY ECU) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR