THEFT DETERRENT SYSTEM, Diagnostic DTC:B2762

DTC Code DTC Name
B2762 Intrusion Sensor Signal Circuit Malfunction

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 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

WIRING DIAGRAM

A01KR8WE01

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


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


    1. Disconnect the O8 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
      O8-2 (+B2) - Body ground Power switch off 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      O8-11 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK INTRUSION SENSOR (THEFT WARNING ULTRASONIC SENSOR)


    1. Reconnect the O8 map light assembly connector.

    2. Using an oscilloscope, check the waveform.

      A01KU3SC02
      *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
      Tester Connection Content
      Tester Connection O8-6 (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)

      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 is output 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 (MAP LIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the E108 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the O8 map light assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E108-12 (ISIF) - O8-6 (IOUT) Always Below 1 Ω
      E108-12 (ISIF) - Body ground Always 10 kΩ or higher
      O8-6 (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

  4. REPLACE MAP LIGHT ASSEMBLY


    1. Replace the map light assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

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

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

      Click here

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

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

      Click here

    6. Check for DTCs.

      Click here


      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