THEFT DETERRENT SYSTEM, Diagnostic DTC:B2764

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

DESCRIPTION

The intrusion sensor (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 a normal/malfunction signal is output from the intrusion sensor (theft warning ultrasonic sensor) as a result of self-diagnosis, the following malfunctions are detected:


  1. Short to ground in ISIF line circuit

  2. Reception of signals other than normal/malfunction signal

  • Map light assembly

  • Intrusion sensor (Theft warning ultrasonic sensor)

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

WIRING DIAGRAM

B003YADE09

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Using an oscilloscope, check the waveform.

      B003Y2QC02
      *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 S3-6 (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 intrusion sensor (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 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 INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Disconnect the S3 map light assembly connector.

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

      Measurement Condition
      Item Content
      Tester Connection S3-6 (IOUT) - S3-19 (GND)
      Condition Immediately after theft deterrent system is 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

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

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


    1. Disconnect the K1 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K1-12 (ISIF) - S3-6 (IOUT) Always Below 1 Ω
      K1-12 (ISIF) - Body ground Always 10 kΩ or higher
      S3-6 (IOUT) - 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

  4. REPLACE MAP LIGHT ASSEMBLY


    1. Temporarily replace the map light assembly with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Turn the power switch on (IG), then off.

    3. Set the theft deterrent system to "ARMED STATE".

      Click here

    4. Check that the security indicator light changes from illuminated to blinking.

    5. Set the theft deterrent system to "DISARMED STATE".

      Click here

    6. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B2764 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (MAP LIGHT ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here