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 terminal circuit, 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 terminal circuit

  2. Reception of signals other than normal/malfunction signal

  • Intrusion sensor (Theft warning ultrasonic sensor)

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Always ○ ○
Malfunction Status Short to ground in ISIF line circuit ○ -
Reception of signals other than normal/malfunction signal - ○
Detection Time - -
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

A005PZME02
*a from Battery
*b ECU-DCC NO. 2
*c Intrusion Sensor (Theft Warning Ultrasonic Sensor)
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • Before replacing the main body ECU (multiplex network body ECU), 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.

      A001SGAC02
      *a

      Component with harness connected

      (Intrusion Sensor (Theft Warning Ultrasonic Sensor))

      		 *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 R10-2 (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 R10 intrusion sensor (theft warning ultrasonic sensor) connector.

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

      Measurement Condition
      Item Content
      Tester Connection R10-2 (IOUT) - R10-3 (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 INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR))


    1. Disconnect the F16 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the R10 intrusion sensor (theft warning ultrasonic sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-12 (ISIF) - R10-2 (IOUT) Always Below 1 Ω
      F16-12 (ISIF) or R10-2 (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