THEFT DETERRENT SYSTEM (w/o Intrusion Sensor) Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horns to sound at intervals of 0.4 seconds.

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 power switch on (IG).

   3. Turn the intelligent tester 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 operated through the intelligent tester.

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   
   1. 

      Disconnect the 2F instrument panel junction block assembly and A main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2F-24 - A-28 (HORN) Always Below 1 Ω

      Table 2. Text in Illustration

      *1

      Component without harness connected (Instrument Panel Junction Block Assembly)

      *2

      Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

   
   
   • OKClick here
   • NGClick here
4. Click here

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

5. Click here

   GO TO HORN SYSTEMClick here

6. Click here

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY