THEFT DETERRENT SYSTEM, Diagnostic DTC:B2764

DTC Code DTC Name
B2764 Short to GND in Intrusion Sensor Signal Circuit

DESCRIPTION

The theft warning ultrasonic 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 ISIF line, the main body ECU (multiplex network body ECU) stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2764 Short to GND in Intrusion Sensor Signal Circuit

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

  1. ISIF line circuit is shorted to ground

  2. Reception of signals other than normal/trouble signal

  • Map light assembly

  • Theft warning ultrasonic sensor

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

B0058C2E11

CAUTION / NOTICE / HINT

Note


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

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

  • 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.*

    *: w/ Door Control Battery

    Click here

PROCEDURE


  1. CHECK WAVEFORM (THEFT WARNING ULTRASONIC SENSOR) (IOUT)


    1. Using an oscilloscope, check the waveform.

      B00573AC02
      *a

      Component with harness connected

      (Map Light Assembly)

      		 *b IOUT Initial Signal
      *c IOUT 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 T6-6 (IOUT) - 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 ultrasonic 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).
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK VOLTAGE (THEFT WARNING ULTRASONIC SENSOR) (IOUT)


    1. B005ASKC04
      *a

      Front view of wire harness connector

      (to Map Light Assembly)

      Disconnect the map light assembly connector.

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

      Standard Voltage
      Tester Connection Condition
      T6-6 (IOUT) - T6-19 (GND) Immediately after theft deterrent system set
      Result
      Result Proceed to
      IOUT voltage is below 1 V when theft deterrent system is set A
      IOUT voltage is 6.5 V or higher when theft deterrent system is set B

      Tech Tips

      With connector T6 of the map light assembly disconnected, measure the voltage at IOUT when the theft deterrent system is set.


    B

    INSPECT MAP LIGHT ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MAP LIGHT ASSEMBLY)


    1. Disconnect the I47 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the T6 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I47-12 (ISIF) - T6-6 (IOUT) Always Below 1 Ω
      I47-12 (ISIF) - Body ground Always 10 kΩ or higher
      T6-6 (IOUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK (for LHD)
      OK (for RHD)
      NG

    OK (for LHD)

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

    OK (for RHD)

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT MAP LIGHT ASSEMBLY


    1. Remove the map light assembly.

      Click here

    2. B00588SE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 (GND) -B-19 (GND) Always Below 1 Ω
      A-2 (IOUT) -B-6 (IOUT) Always Below 1 Ω
      A-4 (+B2) - B-2 (+B2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE THEFT WARNING ULTRASONIC SENSOR Click here

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here