THEFT DETERRENT SYSTEM Improper Operation

DESCRIPTION

If the alarm function of the theft deterrent system operates unintentionally, one of the following may be the cause.


Tech Tips

Preconditions for arming preparation:


  • Make sure the ignition switch is off, all the doors and the hood are closed and all the doors have been locked by wireless operation or entry operation.

WIRING DIAGRAM

B006XVLE10

CAUTION / NOTICE / HINT

Note


  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • The theft deterrent system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the theft deterrent system after confirming that the communication system is functioning properly.*

    Click here


    • *: w/ Smart Entry and Start System

  • The following troubleshooting procedure is based on the assumption that systems related to the theft deterrent system are normal. Confirm that the systems related to the theft deterrent system are not malfunctioning before performing the following procedure.

    Click here

  • If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.

  • The operation history function uses the current system time of the GTS and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the GTS system clock is accurately set to the current time.

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*

    Click here


    • *: w/ Door Control Battery

PROCEDURE


  1. CHECK THEFT DETERRENT SYSTEM OPERATION HISTORY


    1. Use the GTS to check the theft deterrent system operation history around the time the customer reported the malfunction to have occurred.

      Click here


      1. Check if there is operation history around the time that the customer reported the malfunction to have occurred, and perform an operation check.

      Result
      Result Proceed to
      There is operation history around the time that the customer reported the malfunction to have occurred, but a malfunction could not be identified during the operation check. A
      There is operation history around the time that the customer reported the malfunction to have occurred, and the malfunction was identified during the operation check. B
      There is no operation history around the time that the customer reported the malfunction to have occurred. C

    B

    INTERVIEW THE CUSTOMER Click here

    C

    END

    A

  2. CHECK SECURITY INDICATOR LIGHT OPERATION


    1. Check that the security indicator light is illuminated when the theft deterrent system is in the arming preparation state.

      Click here

    2. Check that the security indicator light blinks when the theft deterrent system is in the arming state.

      Click here

      Tech Tips

      State of Theft Deterrent System Contents Security Indicator Light Condition
      Disarmed state (1), (2) Theft deterrent system is unset.

      • Off (Immobiliser function unset)

      • Blinking (Immobiliser function set)
      Arming preparation state

      Standby period after theft deterrent system set conditions are met but before theft deterrent system is actually set (approximately 30 seconds).

      (Theft detection not possible)

      		 On
      Armed state

      Theft deterrent system is set.

      (Theft detection is possible)

      		 Blinking (Immobiliser function set)
      Alarm sounding state

      Theft attempt is detected, and alarm operates using turn signal lights, security horn assembly and vehicle horns.

      (Alarm sounds for 27.5 seconds)

      		 On
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER PROBLEM Click here

    OK

  3. READ VALUE USING GTS (hood Courtesy SW)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Hood Courtesy SW Engine hood courtesy switch OFF or ON

      OFF: Engine hood closed

      ON: Engine hood open

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      Hood Courtesy SW
      OK
      The GTS display changes correctly in response to the engine hood courtesy switch (hood lock assembly) status.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) Click here

    OK

  4. INTERVIEW THE CUSTOMER


    1. If the problem symptoms could not be reproduced, explain to the customer the details of the operation history, such as the input signal timings of the key, etc.

      Click here

      OK
      Cause was identified
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    CHECK FOR INTERMITTENT PROBLEMS Click here

  5. INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)


    1. Remove the hood lock assembly.

      Click here

    2. Inspect the engine hood courtesy switch (hood lock assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HOOD LOCK ASSEMBLY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)


    1. Disconnect the A15 engine hood courtesy switch (hood lock assembly) connector.

    2. Disconnect the K52 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K52-30 (HCTY) - A15-1 (+) Always Below 1 Ω
      K52-30 (HCTY) or A15-1 (+) - Other terminals and body ground Always 10 kΩ or higher
      A15-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INTERVIEW THE CUSTOMER


    1. If the problem symptoms could not be reproduced, explain to the customer the details of the operation history, such as the input signal timings of the key, etc.

      Click here

      OK
      Cause was identified
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    CHECK FOR INTERMITTENT PROBLEMS Click here