Theft Deterrent System Horn Circuit

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT HORN

PERFORM ACTIVE TEST USING TECHSTREAM

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

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 transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Horn Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT HORN

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

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


B
GO TO HORN SYSTEM (COROLLA_ZRE142 RM0000016F5071X.html)
A


2.PERFORM ACTIVE TEST USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Select the item below in the Active Test and then check that the horn operate.

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Vehicle Horn
    		Vehicle horn
    		ON / OFF
    		-
    OK:
    The vehicle horn sounds or stops correctly when operating them through the Techstream.


NG
Go to step 3
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

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


  1. Disconnect the 2B instrument panel junction block and 1A engine room relay block connectors.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function).Theft Deterrent System Horn Circuit

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2B-28 - 1A-7
    		Always
    		Below 1 Ω
    2B-28 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)