THEFT DETERRENT SYSTEM, Diagnostic DTC:B2764

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

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B2764

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 assembly

  • Intrusion sensor (theft warning ultrasonic sensor)

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

B002BZJE25
*a from Auxiliary Battery
*b Intrusion Sensor (Theft Warning Ultrasonic Sensor)
*c Map Light Assembly
*d Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


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


    1. Using an oscilloscope, check the waveform.

      B002BJ7E02
      Text in Illustration
      *a

      Component with harness connected

      (Map Light 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 Y9-8 (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).

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    1. B002BLXE02
      Text in Illustration
      *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
      Y9-8 (IOUT) - Y9-10 (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 Y9 of the map light assembly disconnected, measure the voltage at IOUT when the theft deterrent system is set.


    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    A

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


    1. Disconnect the N13 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the Y9 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N13-12 (ISIF) - Y9-8 (IOUT) Always Below 1 Ω
      N13-12 (ISIF) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (MULTIPLEXNETWORK 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 normally functioning one Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

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

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

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

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

    6. Check for DTCs Click here.

      OK
      DTC B2764 is not output.

    OK

    END (MAP LIGHT ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here