THEFT DETERRENT SYSTEM Security Horn Circuit

DESCRIPTION

When the theft deterrent system is operating, the relay in the main body ECU RH (cowl side junction block RH) turns on and off, causing the security horn assembly to sound.

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 security horn assembly operates.

      Body
      Tester Display Test Part Control Range Diagnostic Note Security Horn Security horn ON/OFF -

      OK
      The security horn assembly sounds and stops correctly when operated through the intelligent tester.

   
   

   NG

   INSPECT SECURITY HORN ASSEMBLY Click here

   OK

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

2. INSPECT SECURITY HORN ASSEMBLY

   
   

   1. 

      Remove the security horn assembly Click here.

   2. Check the operation of the security horn assembly.

      Standard
      Measurement Condition Specified Condition Battery positive (+) → Terminal 1 Horn sounds Battery negative (-) → Horn body

   
   

   NG

   REPLACE SECURITY HORN ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - SECURITY HORN ASSEMBLY)

   
   

   1. 

      Disconnect the A36 cowl side junction block RH connector and A37 security horn connector.

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

      Standard Resistance
      Terminal Connection Condition Specified Condition A36-1 (SH) - A37-1 Always Below 1 Ω A36-1 (SH) - Body ground Always 10 kΩ or higher A37-1 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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