THEFT DETERRENT SYSTEM 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 horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT HORN

   
   

   1. Press the horn switch and check if the horn sounds.

      Result
      Result Proceed to Horn sounds A Horn does not sound B

   
   

   B

   GO TO HORN SYSTEM Click here

   A

2. 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. Entry the following menus: Body / Main Body / Active Test.

   5. According to the display on the intelligent tester, perform the Active Test.

      Main Body (Main Body ECU (Multiplex Network Body ECU))

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

      Result
      Result Proceed to The vehicle horn does not sound and stop correctly when operated through the intelligent tester A The vehicle horn sounds and stops correctly when operated through the intelligent tester B

   
   

   B

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

   A

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Disconnect the 2C instrument panel junction block assembly and MB 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 2C-32 - MB-15 (HRLY) Always Below 1 Ω

      Text in Illustration

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

   
   

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)