Theft Deterrent System (For Sedan) Ignition Switch Circuit

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING TECHSTREAM (IGNITION SWITCH)

INSPECT FUSE (ECU-IG)

CHECK HARNESS OR CONNECTOR (IG POWER SOURCE)

THEFT DETERRENT SYSTEM (for Sedan) - Ignition Switch Circuit


DESCRIPTION

When the ignition switch is turned to the ON position, the battery positive voltage is applied to terminal IG of the theft warning ECU. When the battery positive voltage is applied to terminal IG of the ECU while the theft deterrent system is operating, the warning stops. Furthermore, the power supplied from terminal IG of the ECU is used as the power for the door courtesy switch and position switch, etc.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch ON and turn the tester ON.

  1. Clear the DTCs.

  1. Check whether DTC B1269 recurs 10 seconds or more after the ignition switch is turned on.

    OK:
    No DTC is output.


NG
GO TO DTC CHART
OK


2.READ VALUE USING TECHSTREAM (IGNITION SWITCH)

  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 Data List and read the display on Techstream.

    Theft Warning ECU:

    Item
    		Measurement Item/Display (Range)
    		Normal Condition
    		Diagnostic Note
    IG SW
    		Ignition switch signal ON/OFF
    		ON: Key is in ON or START position
    OFF: Key is in LOCK or ACC position
    		-


NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3.INSPECT FUSE (ECU-IG)


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

  1. Remove the ECU-IG fuse from the main body ECU.

  1. Measure the resistance.

    Standard resistance:
    Below 1 Ω

  1. Reinstall the ECU-IG fuse.



NG
REPLACE FUSE
OK


4.CHECK HARNESS OR CONNECTOR (IG POWER SOURCE)


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

  1. Disconnect the D26 theft warning ECU connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage.

    Standard voltage:
    Tester Connection
    		Specified Condition
    D26-9 (IG) - Body ground
    		11 to 14 V

  1. Reconnect the theft warning ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY (YARIS_NCP93 RM0000033J4009X.html)