THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

• The theft warning siren assembly has an internal battery. If the vehicle's battery or any of the communication lines is open, the theft warning siren assembly detects it by itself and sounds. Although the theft warning siren assembly usually sounds by receiving a signal from the main body ECU RH, the theft warning siren assembly can sound by its internal battery in case the vehicle's battery is open.

• The main body ECU RH sends an arming signal to the theft warning siren assembly while transferring to the armed state, and it also sends a disarming signal to the siren while switching to the disarmed state. Also, the main body ECU RH 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 engine switch on (IG).

   3. Turn the tester on.

   4. Select the item below in the Active Test and then check that the indicator operates.

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

      OK
      The theft warning siren assembly sounds when operated it through the intelligent tester.

   
   

   NG

   INSPECT THEFT WARNING SIREN ASSEMBLY Click here

   OK

   REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

2. INSPECT THEFT WARNING SIREN ASSEMBLY

   
   

   1. 

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

      Standard Voltage

      Tester Connection Condition Specified Condition P36-1 (+B) - Body ground Always 11 to 14 V P36-2 (GND) - Body ground Always Below 1 V P36-3 (CONT) - Body ground When switched from armed state or arming preparation state to disarmed state (1) Pulse generation*1 (Using oscilloscope) P36-3 (CONT) - Body ground When switched from arming preparation state to armed state (2) Pulse generation*2 (Using oscilloscope) P36-3 (CONT) - Body ground Normal condition (Except (1) and (2)) Approx. 1.4 V

   2. Wave pattern of the pulse generation *1 and *2

      

   
   

   NG

   REPLACE THEFT WARNING SIREN ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (THEFT WARNING SIREN ASSEMBLY - BATTERY)

   
   

   1. 

      Disconnect P36 theft warning siren assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition P36-1 (+B) - Body ground Always 11 to 14 V

   
   

   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
      Symbol (Tester Connection) Condition Specified Condition P36-2 (GND) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. 

      Disconnect the J75 main body ECU RH (cowl side junction block) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition J75-12 (SSCL) - P36-3 (CONT) Always Below 1 Ω J75-12 (SSCL) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)