THEFT DETERRENT SYSTEM While Alarm is Armed, Engine Hood is opened but Alarm does not Sound

DESCRIPTION

A situation in which the alarm is armed but does not sound when the engine hood is opened can be caused when the main body ECU (multiplex network body ECU) cannot detect whether the engine hood courtesy switch is open or closed.

If the alarm does not sound, there may be a malfunction in the engine hood courtesy switch, main body ECU (multiplex network body ECU) or a wire harness.

WIRING DIAGRAM

B006LUUE01

PROCEDURE


  1. CHECK SECURITY INDICATOR LIGHT OPERATION


    1. Close all doors and the engine hood.

    2. Lock the doors using the wireless operation or entry operation.

    3. Check that the security indicator light illuminates.

    4. After 9 seconds*1 or 30 seconds*2 have elapsed, check that the security indicator light changes from illuminated to flashing.


      • *1: w/ Panoramic View Monitor System

      • *2: w/o Panoramic View Monitor System

      Tech Tips

      The illumination status of the security indicator light can be used to determine whether the theft deterrent system is set or unset.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO THEFT DETERRENT SYSTEM CANNOT BE SET OR UNSET Click here

    OK

  2. READ VALUE USING GTS (HOOD COURTESY SW)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    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 ON or OFF

      ON: Engine hood open

      OFF: Engine hood closed

      		 -

      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

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    NG

  3. INSPECT HOOD LOCK ASSEMBLY


    1. Remove the hood lock assembly.

      Click here

    2. Inspect the hood lock assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HOOD LOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (HOOD LOCK ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the A23 hood lock assembly connector.

    2. Disconnect the G63 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
      A23-1 - G63-11 Always Below 1 Ω
      A23-2 - Body ground Always Below 1 Ω
      A23-1 or G63-11 - 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