THEFT DETERRENT SYSTEM Engine Hood Courtesy Switch Circuit

DESCRIPTION

The security courtesy switch is installed together with the hood lock. This switch turns off when the engine hood is closed and turns on when the engine hood is opened.

If the security courtesy switch signal wire is cut or disconnected during the armed state, the main body ECU (multiplex network body ECU) detects this and sounds the alarm.

WIRING DIAGRAM

A003XIUE03

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, read the Data List.

      Main Body (Main Body ECU (Multiplex Network Body ECU))
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Hood Courtesy SW Security courtesy switch signal/ON or OFF

      ON: Engine hood open

      OFF: Engine hood closed

      		 -
      OK
      The indicator on the intelligent tester switches between ON and OFF in accordance with the security courtesy switch (hood lock assembly) status.

    NG

    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Disconnect the 2C instrument panel junction block assembly and MB main body ECU (multiplex network body ECU) connectors.

      A003Y9NE13

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-38 - MB-20 (HCTY) Always Below 1 Ω
      2C-38 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SECURITY COURTESY SWITCH - BODY GROUND)


    1. Disconnect the A45 security courtesy switch (hood lock assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A45-1 (+) - 2C-38 Always Below 1 Ω
      A45-1 (+) - Body ground Always 10 kΩ or higher
      A45-4 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SECURITY COURTESY SWITCH - BODY GROUND)


    1. Disconnect the H16 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A45-2 (HWM+) - H16-12 (SLF+) Always Below 1 Ω
      A45-2 (HWM+) - Body ground Always 10 kΩ or higher
      A45-3 (HWM-) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT SECURITY COURTESY SWITCH (HOOD LOCK ASSEMBLY)


    1. Remove the hood lock assembly Click here.

      A003Y9OE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (+) - 4 (E) Locked 10 kΩ or higher
      1 (+) - 4 (E) Unlocked Below 1 Ω
      2 (HWM+) - 3 (HWM-) Always Below 1 Ω
      Text in Illustration
      *A for LHD *B for RHD
      *1 Unlocked *2 Locked
      *a

      Component without harness connected

      (Security Courtesy Switch (Hood Lock Assembly))

      		 - -

    NG

    REPLACE SECURITY COURTESY SWITCH (HOOD LOCK ASSEMBLY) Click here

    OK

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