Theft Deterrent System (For Hatchback) 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 SECURITY HORN ASSEMBLY

INSPECT EU-DRL/S-HORN RELAY

CHECK HARNESS AND CONNECTOR (EU-DRL/S-HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND SECURITY HORN)

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

THEFT DETERRENT SYSTEM (for Hatchback) - Security Horn Circuit


DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the security horn assembly to sound.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following 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 Techstream on.

  1. Enter the following menus: Body Electrical / Main Body / Active Test.

  1. according to the display on the Techstream, perform the Active Test.

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Security Horn
    		Security horn
    		OFF / ON
    		-
    OK:
    The security horn sounds and stops correctly when operating it through the Techstream.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM00000368901IX.html)

2.INSPECT SECURITY HORN ASSEMBLY

  1. Inspect the security horn assembly (YARIS_NCP93 RM0000031YY008X.html).



NG
REPLACE SECURITY HORN ASSEMBLY (YARIS_NCP93 RM000003RZB007X.html)
OK


3.INSPECT EU-DRL/S-HORN RELAY


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

  1. Remove the EU-DRL/S-HORN relay from No. 2 engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage is not applied to terminals 1 and 2
    		10 kΩ or higher
    Battery voltage is applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE EU-DRL/S-HORN RELAY
OK


4.CHECK HARNESS AND CONNECTOR (EU-DRL/S-HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND SECURITY HORN)

  1. Disconnect the 3C instrument panel junction block assembly connector.

  1. Disconnect the A49 security horn assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Relay terminal 2 - 3C-20
    		Always
    		Below 1 Ω
    Relay terminal 3 - A49-1
    		Always
    		Below 1 Ω
    A49-2 - Body ground
    		Always
    		Below 1 Ω
    3C-20 - Body ground
    		Always
    		10 kΩ or higher
    A49-1 - Body ground
    		Always
    		10 kΩ or higher
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Relay terminal 1 - Body ground
    		Always
    		11 to 14 V
    Relay terminal 5 - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


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

  1. Remove the instrument panel junction block assembly (YARIS_NCP93 RM000003TOE00CX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3C-20 - MB-17 (SHRN)
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (YARIS_NCP93 RM000003TOE00CX.html)
OK

REPLACE MAIN BODY ECU (YARIS_NCP93 RM000003TOE00CX.html)