Theft Deterrent System (For Hatchback) Ignition Switch Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)

INSPECT IGNITION OR START SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (IGNITION OR START SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)

THEFT DETERRENT SYSTEM (for Hatchback) - Ignition Switch Circuit


DESCRIPTION

The main body ECU determines the ignition switch position (OFF, ACC, ON) based on signals from the IG or ACC circuit.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.READ VALUE USING TECHSTREAM

  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 / Data List.

  1. According to the display on the Techstream, read the Data List.

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    ACC SW
    		Ignition switch / OFF or ON
    		OFF: Ignition switch LOCK or ON
    ON: Ignition switch ACC
    		-
    IG SW
    		Ignition switch / OFF or ON
    		OFF: Ignition switch LOCK or ACC
    ON: Ignition switch ON
    		-
    OK:
    When the ignition switch is operated, the display changes as shown in the table.


NG
Go to step 2
OK

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

2.CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)


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

  1. Disconnect the 3E junction block connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3E-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Instrument Panel Junction Block)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT IGNITION OR START SWITCH ASSEMBLY

  1. Inspect the ignition or start switch assembly (YARIS_NCP93 RM000000X2S02EX.html).



NG
REPLACE IGNITION OR START SWITCH ASSEMBLY (YARIS_NCP93 RM000000WC7027X.html)
OK


4.CHECK HARNESS AND CONNECTOR (IGNITION OR START SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK)

  1. Reinstall the ignition or start switch assembly.

  1. Disconnect the 3A and 3B junction block connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3A-29 - 3B-40
    		Ignition switch ON
    		Below 1 Ω
    3B-37 - 3D-40
    		Ignition switch ACC
    		Below 1 Ω
    3D-8 - Body Ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK (YARIS_NCP93 RM000003TOE00CX.html)