THEFT DETERRENT SYSTEM, Diagnostic DTC:B2762

DTC Code DTC Name
B2762 Intrusion Sensor Signal Circuit Malfunction

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
B2762 Intrusion Sensor Signal Circuit Malfunction

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. Open 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

WIRING DIAGRAM

B004OZ4E01
*a from Auxiliary 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 HARNESS AND CONNECTOR (AUXILIARY BATTERY - INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) - BODY GROUND)


    1. Disconnect the O15 intrusion sensor (theft warning ultrasonic sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O15-1 (+B) - Body ground Power switch off 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      O15-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Reconnect the O15 intrusion sensor (theft warning ultrasonic sensor) connector.

    2. Using an oscilloscope, check the waveform.

      B004QG0C01
      *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 O15-2 (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
      Result Proceed to
      OK (There is an initial response) A
      NG (There is no initial response and the waveform output remains HI) B
      NG (Waveform output remains LO) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

    C

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


    1. Disconnect the F18 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O15 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
      F18-12 (ISIF) - O15-2 (IOUT) Always Below 1 Ω
      F18-12 (ISIF) or O15-2 (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