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 radar 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 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 a normal/malfunction signal is output from the intrusion sensor (theft warning radar sensor) as a result of self-diagnosis, the following malfunctions are detected:


  1. Short to ground in ISIF line circuit

  2. Reception of signals other than normal/malfunction signal

  • Map light assembly

  • Intrusion sensor (Theft warning radar 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

B002CYLE02
*a from Battery
*b Intrusion Sensor (Theft Warning Radar 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 Service Bulletin.

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

PROCEDURE


  1. CHECK INTRUSION SENSOR (THEFT WARNING RADAR SENSOR)


    1. Using an oscilloscope, check the waveform.

      B002E8LC01
      *a

      Component with harness connected

      (Map Light Assembly)

      		 *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 W8-8 (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 radar 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 RADAR SENSOR)


    1. Disconnect the W8 map light assembly connector.

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

      Measurement Condition
      Item Content
      Tester Connection W8-8 (IOUT) - W8-10 (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

    INSPECT MAP LIGHT ASSEMBLY Click here

    A

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


    1. Disconnect the K12 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K12-12 (ISIF) - W8-8 (IOUT) Always Below 1 Ω
      K12-12 (ISIF) or W8-8 (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

  4. INSPECT MAP LIGHT ASSEMBLY


    1. B002DEPC06
      *a

      Component without harness connected

      (Map Light Assembly)

      Remove the map light assembly.

      Click here

    2. Disconnect the intrusion sensor (theft warning radar sensor) connector from map light assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W8-8 (IOUT) - US1-3 (IOUT) Always Below 1 Ω
      W8-8 (IOUT) or US1-3 (IOUT) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INTRUSION SENSOR (THEFT WARNING RADAR SENSOR) Click here

    NG

    REPLACE MAP LIGHT ASSEMBLY Click here