THEFT DETERRENT SYSTEM (w/ Smart Entry and Start System) Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU transmits a signal to cause the horn to sound at 0.4 second intervals.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   INSPECT HORNS

   
   

   1. Press the horn switch and check if the horns sound.

      Result
      Result Proceed to Horns sound A Horns do not sound B

   
   
   • AClick here
   • BClick here
2. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the intelligent tester main switch on.

   4. Select the item below in the Active Test and then check that the horns operate.

      Table 1. Main Body:

      Tester Display	Test Part	Control Range	Diagnostic Note
      Vehicle Horn	Vehicle horns	ON / OFF	-

      OK
      The vehicle horns sound and stop correctly when operating them through the intelligent tester.

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - ENGINE ROOM JUNCTION BLOCK)

   
   
   1. 

      Disconnect the 1D instrument panel junction block connector and 2D engine room junction block connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition 1D-11 - 2D-10 Always Below 1 Ω 1D-11 - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
4. Click here

   REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

5. Click here

   GO TO HORN SYSTEMClick here

6. Click here

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

7. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR