THEFT DETERRENT SYSTEM Theft Warning Siren Circuit

DESCRIPTION

The theft warning siren assembly sounds if either of the following conditions is met:

• The theft deterrent system is in the alarm sounding state.

• The theft warning siren assembly is in the armed state when the power source, ground or communication line is open.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS (SECURITY HORN2)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power 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 Horn2	Theft warning siren assembly	OFF/ON	-

      
      Body Electrical > Main Body > Active Test

      Tester Display
      Security Horn2

      OK
      The theft warning siren assembly sounds and stops correctly when operated using the GTS.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

2. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - THEFT WARNING SIREN ASSEMBLY - BODY GROUND)

   
   
   1. 

      *a	Front view of wire harness connector (to Theft Warning Siren Assembly)

      Disconnect the P21 theft warning siren assembly connector.

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

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      P21-5 (+B) - Body ground	Power switch off	11 to 14 V

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      P21-2 (GND) - Body ground	Always	Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the K1 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
      K1-18 (SSCL) - P21-4 (CONT)	Always	Below 1 Ω
      K1-18 (SSCL) - Body ground	Always	10 kΩ or higher
      P21-4 (CONT) - Body ground	Always	10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. REPLACE THEFT WARNING SIREN ASSEMBLY

   
   

   1. Temporarily replace the theft warning siren assembly with a new or known good one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to NEXT

   
   

   NEXT

5. CHECK THEFT WARNING SIREN ASSEMBLY

   
   

   1. Turn the power switch on (IG), then off.

   2. Set the theft deterrent system to "ARMED STATE".

      Click here

   3. Check that the security indicator changes from illuminated to blinking.

   4. Change the theft deterrent system to "ALARM SOUNDING STATE".

      Click here

   5. Check that the theft warning siren assembly is sounding.

      OK
      Theft warning siren assembly is sounding.

      Result
      Proceed to OK NG

   
   

   OK

   END (THEFT WARNING SIREN ASSEMBLY WAS DEFECTIVE)

   NG

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