Theft Deterrent System (For Sedan) Security Horn Circuit

Vehicle Interior. Yaris. Ncp93, 131
Theft Deterrent Keyless Entry. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN)

INSPECT FUSE (ECU-B)

CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY- BODY GROUND)

INSPECT SECURITY HORN ASSEMBLY

CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY - SECURITY HORN ASSEMBLY)

THEFT DETERRENT SYSTEM (for Sedan) - Security Horn Circuit


DESCRIPTION

When the theft deterrent system is changed from the armed state to the alarm sounding state, the theft warning ECU can sound the security horn. The horn cycles between ON and OFF at intervals of approximately 0.4 seconds.

WIRING DIAGRAM


Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan).Theft Deterrent System (For Sedan) Security Horn Circuit


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester main switch ON.

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

    Theft Warning ECU:

    Item
    		Test Details
    		Diagnostic Note
    Security Horn
    		Security horn ON/OFF
    		-
    OK:
    Security horn operates normally.


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.INSPECT FUSE (ECU-B)


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan).Theft Deterrent System (For Sedan) Security Horn Circuit

  1. Remove the ECU-B fuse from the engine room R/B.

  1. Measure the resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the ECU-B fuse.



NG
REPLACE FUSE
OK


3.CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY- BODY GROUND)


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan).Theft Deterrent System (For Sedan) Security Horn Circuit

  1. Disconnect the D26 theft warning ECU connector.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Specified Condition
    D26-13 (+B2) - Body ground
    		11 to 14 V

  1. Reconnect the theft warning ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT SECURITY HORN ASSEMBLY


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan).Theft Deterrent System (For Sedan) Security Horn Circuit

  1. Disconnect the A23 security horn connector.

  1. Check the operation of the security horn.

    Standard:
    Measurement Condition
    		Specified Condition
    Battery positive (+) → Terminal 1 (B)
    Battery negative (-) → Terminal 2 (L)
    		Security horn sounds

  1. Reconnect the security horn connector.



NG
REPLACE SECURITY HORN ASSEMBLY (YARIS_NCP93 RM000001I0E00RX.html)
OK


5.CHECK HARNESS AND CONNECTOR (THEFT WARNING ECU ASSEMBLY - SECURITY HORN ASSEMBLY)

  1. Disconnect the D26 theft warning ECU and the A23 security horn connectors.



    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan).Theft Deterrent System (For Sedan) Security Horn Circuit

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D26-15 (SH-) - A23-1 (B)
    		Below 1 Ω
    A23-2 (L) - Body ground
    		Below 1 Ω
    D26-15 (SH-) or A23-1 (B) - Body ground
    		10 kΩ or higher

  1. Reconnect the theft warning ECU and the security horn connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY (YARIS_NCP93 RM0000033J4009X.html)