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THEFT DETERRENT SYSTEM, Diagnostic DTC:B2762

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DTC Code DTC Name
B2762 Intrusion Sensor Signal Circuit Malfunction
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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 line, 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 line circuit

  2. Reception of signals other than normal/malfunction signal

  • Map light assembly

  • Intrusion sensor (Theft warning ultrasonic sensor)

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector
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WIRING DIAGRAM

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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.

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - MAP LIGHT ASSEMBLY - BODY GROUND)


    1. B003XQ6C03
      *a

      Front view of wire harness connector

      (to Map Light Assembly)

      Disconnect the S3 map light assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      S3-2 (+B2) - Body ground Power switch off 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      S3-19 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  2. Click here

    CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Reconnect the S3 map light assembly connector.

    2. B003Y2QC02
      *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

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection S3-6 (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)
      Tip:

      • 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

  3. Click here

    REPLACE MAP LIGHT ASSEMBLY


    1. Temporarily replace the map light assembly with a new or known good one.

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      Result
      Proceed to
      NEXT

  4. Click here

    CHECK FOR DTC


    1. Clear the DTCs.

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      1. Body Electrical > Main Body > Clear DTCs


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

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

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

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

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    6. Check for DTCs.

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      1. Body Electrical > Main Body > Trouble Codes


      OK
      DTC B2762 is not output.
      Result
      Proceed to
      OK
      NG

    • OK

      END (MAP LIGHT ASSEMBLY WAS DEFECTIVE)

    • NG

      REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)Click here

  5. Click here

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


    1. Disconnect the K1 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the S3 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K1-12 (ISIF) - S3-6 (IOUT) Always Below 1 Ω
      K1-12 (ISIF) - Body ground Always 10 kΩ or higher
      S3-6 (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