THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

B002CCSE01

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.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (SECURITY HORN)


    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 / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Security Horn Security horn Assembly OFF/ON -

      Body Electrical > Main Body > Active Test
      Tester Display
      Security Horn
      OK
      The security horn assembly sounds and stops correctly when operated through the GTS.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT SECURITY HORN ASSEMBLY


    1. Remove the security horn assembly.

      Click here

    2. Inspect the security horn assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SECURITY HORN ASSEMBLY Click here

    OK

  3. INSPECT LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY


    1. B002E02C01
      *a

      Component without harness connected

      (Luggage Room Junction Block Assembly)

      Remove the luggage room junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6E-1 - 6A-15 When battery voltage is applied between terminals 6E-1 - 6B-9 Below 1 Ω
      6A-9 - 6A-15 10 kΩ or higher
      6E-1 - 6A-15 When battery voltage is not applied between terminals 6E-1 - 6B-9 10 kΩ or higher
      6A-9 - 6A-15 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY

    OK

  4. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY - COWL SIDE JUNCTION BLOCK LH)


    1. Disconnect the 6B luggage room junction block assembly connector.

    2. Disconnect the 5A cowl side junction block LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6B-9 - 5A-46 Always Below 1 Ω
      6B-9 or 5A-46 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (BATTERY - LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY)


    1. B002E1OC02
      *a

      Front view of wire harness connector

      (to Luggage Room Junction Block Assembly)

      Disconnect the luggage room junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      6E-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY - SECURITY HORN ASSEMBLY AND BODY GROUND)


    1. Disconnect the 6A luggage room junction block assembly connector.

    2. Disconnect the A23 security horn assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      6A-15 - A23-1 Always Below 1 Ω
      6A-9 - Body ground Always Below 1 Ω
      6A-15 or A23-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. Remove the main body ECU (multiplex network body ECU).

      Click here

      B002ESDC02
      *a

      Component without harness connected

      (Cowl Side Junction Block LH)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-46 - MB-17 (SH) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here