THEFT DETERRENT SYSTEM, Diagnostic DTC:B2762

DTC Code DTC Name
B2762 Intrusion Sensor Signal Circuit Malfunction

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
B2762

After normal/trouble signal is output from intrusion sensor (theft warning ultrasonic sensor) as result of self-diagnosis, following malfunctions are detected:


  1. IOUT line circuit is open

  2. Reception of signals other than normal/ trouble signal

  • Map light assembly

  • Intrusion sensor (theft warning ultrasonic sensor)

  • Certification ECU

  • Harness or connector

WIRING DIAGRAM

A000UJFE08
*a from Auxiliary Battery
*b Intrusion Sensor (Theft Warning Ultrasonic Sensor)
*c Map Light Assembly
*d Certification ECU

CAUTION / NOTICE / HINT

Note


  • If the certification 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 HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - BATTERY AND BODY GROUND)


    1. A000UXHE02
      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 Specified Condition
      X4-6 (+B) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X4-16 (GND9) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Using an oscilloscope, check the waveform.

      A000XVPE02
      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 X6-1 (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 certification ECU.

      • If the waveform output remains LO, there may be a problem with the certification ECU, as there is no input from the certification ECU.

      OK
      The waveform displays properly (HI is 6.5 V or higher and LO is below 1 V).
      Result
      Result Proceed to
      NG (Waveform output remains LO) A
      NG (There is no initial response and the waveform output remains HI) B
      OK (There is an initial response) C

    B

    REPLACE MAP LIGHT ASSEMBLY Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - MAP LIGHT ASSEMBLY)


    1. Disconnect the L16 certification ECU connector.

    2. Disconnect the X6 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L16-4 (IOUT) - X6-1 (IOUT) Always Below 1 Ω
      L16-4 (IOUT) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CERTIFICATION ECU

    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 B2762 is not output.

    OK

    END (MAP LIGHT ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR) Click here