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 short to ground 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 intrusion sensor (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 sub-assembly

  • Intrusion sensor (theft warning ultrasonic sensor)

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

B000ZDME07

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.

PROCEDURE


  1. CHECK WAVEFORM (INTRUSION SENSOR [THEFT WARNING ULTRASONIC SENSOR]) (IOUT)


    1. Using an oscilloscope, check the waveform.

      B000V8IC03
      *a

      Component with harness connected

      (Map Light Sub-assembly)

      		 *b IOUT Initial Signal
      *c IOUT 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 Z3-4 (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 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 (INTRUSION SENSOR [THEFT WARNING ULTRASONIC SENSOR]) (IOUT)


    1. B000TPXC02
      *a

      Front view of wire harness connector

      (to Map Light Sub-assembly)

      Disconnect the map light sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition
      Z3-4 (IOUT) - Body ground 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 Z3 of the map light sub-assembly disconnected, measure the voltage at IOUT when the theft deterrent system is set.


    B

    INSPECT MAP LIGHT SUB-ASSEMBLY Click here

    A

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


    1. Disconnect the P9 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the Z3 map light sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P9-14 (ISIF) - Z3-4 (IOUT) Always Below 1 Ω
      P9-14 (ISIF) or Z3-4 (IOUT) - Other terminals and 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. INSPECT MAP LIGHT SUB-ASSEMBLY


    1. Remove the map light sub-assembly.

      Click here

    2. B000WRPE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 (GND) - C-3 (GND) Always Below 1 Ω
      A-2 (IOUT) - C-4 (IOUT) Always Below 1 Ω
      A-4 (+B2) - B-5 (+B2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

    NG

    REPLACE MAP LIGHT SUB-ASSEMBLY Click here