THEFT DETERRENT SYSTEM(w/ Entry and Start 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

B001ZUOE08

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.

  • w/ Door Control Battery:

    As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure Click here.

PROCEDURE


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


    1. Using an oscilloscope, check the waveform.

      B001WC0E01
      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 R7-12 (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. B001WHGE01
      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
      R7-12 (IOUT) - R7-17(GND9) Immediately after theft deterrent system set

      Tech Tips

      With connector R7 of the map light assembly disconnected, measure the voltage at IOUT when the 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

    INSPECT MAP LAMP ASSEMBLY Click here

    A

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


    1. Disconnect the E117 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the R7 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E117-12 (ISIF) - R7-12(IOUT) Always Below 1 Ω
      E117-12 (ISIF) - Body ground Always 10 kΩ or higher
      R7-12 (IOUT) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE MAIN BODY ECU (MULTIPLEXNETWORK BODY ECU) Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEXNETWORK BODY ECU) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. INSPECT MAP LAMP ASSEMBLY


    1. Remove the map light assembly. Click here

    2. Remove the intrusion sensor (theft warning ultrasonic sensor) from the map light assembly Click here.

    3. B001YQUE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 (GND) -B-17 (GND9) Always Below 1 Ω
      A-2 (IOUT) -B-12 (IOUT) Always Below 1 Ω
      A-4 (+B2) - B-15 (+B2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here

    NG

    REPLACE MAP LAMP ASSEMBLY Click here