THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

• The theft warning siren assembly has an internal battery. If the battery or any of the communication lines are open, the theft warning siren assembly detects this and sounds its siren.

• Although the theft warning siren assembly usually sounds by receiving a signal from the main body ECU (multiplex network body ECU), the theft warning siren assembly can sound by its internal battery in case the battery is open.

• The main body ECU (multiplex network body ECU) sends an arming signal to the theft warning siren assembly when transferring to the armed state, and it also sends a disarming signal to the siren when switching to the disarmed state. Also, the main body ECU (multiplex network body ECU) can cause the theft warning siren assembly to sound by sending an alarm signal during the alarm sounding state.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST 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 / Active Test.

   5. According to the display on the intelligent tester, perform the Active Test.

      Main Body (Main Body ECU (Multiplex Network Body ECU))

      Tester Display	Test Part	Control Range	Diagnostic Note
      Security Horn2	Theft warning siren	ON / OFF	-

      OK
      The theft warning siren assembly sounds and stops correctly when operated though the intelligent tester.

   
   

   NG

   CHECK THEFT WARNING SIREN ASSEMBLY Click here

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. CHECK THEFT WARNING SIREN ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component with harness connected (Theft Warning Siren Assembly)

      Remove the theft warning siren assembly with harness connected Click here.

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

      Standard Voltage

      Tester Connection Condition Specified Condition M16-1 (+B) - Body ground Power switch off 11 to 14 V M16-2 (GND) - Body ground Always Below 1 V M16-3 (CONT) - Body ground When switched from armed state or arming preparation state to disarmed state (1) or disarmed state (2) (*1) Wave pattern (1) shown in chart below When switched from arming preparation state to armed state (*2) Wave pattern (2) shown in chart below Normal condition (Except (*1) and (*2)) Approx. 1.4 V

   3. Wave pattern

      
   
   

   NG

   CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - THEFT WARNING SIREN ASSEMBLY) Click here

   OK

   REPLACE THEFT WARNING SIREN ASSEMBLY Click here

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - THEFT WARNING SIREN ASSEMBLY)

   
   

   1. Disconnect the E121 main body ECU (multiplex network body ECU) and M16 theft warning siren assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition E121-18 (SSCL) - M16-3 (CONT) Always Below 1 Ω E121-18 (SSCL) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - BODY GROUND)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition M16-2 (GND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)