THEFT DETERRENT SYSTEM > Ignition Switch Circuit


DESCRIPTION

When the ignition switch is turned to the ON position, battery positive voltage is applied to terminal IG of the multiplex network body ECU.

WIRING DIAGRAM


B109005E01


INSPECTION PROCEDURE

1.READ DATA LIST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the intelligent tester main switch on.

  1. Select the item below in the DATA LIST and read the display on the tester.

    BODY (Multiplex network body ECU): 
    Item
    		Test Details
    		Diagnostic Note
    IG SW
    		Ignition switch signal ON/OFF
    		-

    OK:
    When turning the ignition switch on and off, the intelligent tester display changes between "ON" and "OFF".



NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

2.INSPECT FUSES (ECU-IG NO.1, AM1)

  1. Remove the ECU-IG NO.1 and AM1 fuses from the instrument panel J/B.

  1. Measure the resistance.

    Resistance:
    Below 1 Ω



NG
REPLACE FUSES
OK


3.INSPECT RELAY (IG1)

  1. Install the ECU-IG NO.1 and AM1 fuses to the instrument panel J/B.



    B109010

  1. Remove the IG1 relay from the instrument panel J/B.

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

    Resistance:
    Tester Condition
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    Below 1 Ω
    (When battery voltage is applied to terminals 1 and 2)



NG
REPLACE RELAY
OK


4.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

  1. Install the IG1 relay to the instrument panel J/B.



    B110511E02

  1. Disconnect the I14 switch connector.

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

    Resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    2 - 4
    		ON
    		Below 1 Ω



NG
REPLACE IGNITION OR STARTER SWITCH ASSEMBLY
OK


5.CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL J/B ASSEMBLY)

  1. Connect the I14 switch connector.



    B110530E01

  1. Disconnect the 1A J/B connector.

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

    Voltage:
    Symbol (Tester Connection
    		Switch Position
    		Specified Condition
    IG (1A-1) - Body ground
    		Ignition switch ON
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - INSTRUMENT PANEL J/B)


    B110531E09

  1. Disconnect the 1I J/B connector.

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

    Resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    1I-4 - 1I-9
    		Ignition switch ON
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B (BODY ECU) - BODY GROUND)


    B110542E01

  1. Disconnect the 1F J/B connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    1F-10 - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE INSTRUMENT PANEL J/B ASSEMBLY