LIGHTING SYSTEM > Ignition Switch Circuit

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DESCRIPTION

This circuit detects the state of the ignition switch and sends it to the body ECU.

WIRING DIAGRAM


B110594E02


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and press the intelligent tester main switch ON.

  1. Select the items below in the DATA LIST, and read the displays on the intelligent tester.

    BODY NO.1: 
    Item
    		Measurement Item/
    Display (Range)
    		Normal Condition
    		Diagnostic Note
    ACC SW
    		ACC SW signal/ON or OFF
    		ON: Ignition key is in ACC, ON or START position
    OFF: Ignition key is in OFF position
    		-
    IG SW
    		IG SW signal/ON or OFF
    		ON: Ignition key is in ON or START position
    OFF: Ignition key is in OFF or ACC position
    		-



NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

2.INSPECT FUSE

  1. Inspect the ECU-ACC fuse, ECU-IG No.1 fuse and AM1 fuse in the instrument panel junction block assembly.

    Resistance:
    Below 1 Ω



NG
REPLACE FUSE
OK


3.INSPECT RELAY


    E064835

  1. Inspect ACC relay continuity.

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

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

      Resistance:
      Tester connection
      		Condition
      		Specified resistance
      3 - 5
      		Always
      		10 kΩ or higher
      3 - 5
      		Apply B+ between the terminal 1 and 2
      		Below 1 Ω



    E064835

  1. Inspect IG1 relay continuity.

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

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

      Resistance:
      Tester connection
      		Condition
      		Specified resistance
      3 - 5
      		Always
      		10 kΩ or higher
      3 - 5
      		Apply B+ between the terminal 1 and 2
      		Below 1 Ω



NG
REPLACE RELAY
OK


4.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC, IG)


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


    E068613E02

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    1I-3 - Body ground
    		Ignition switch is OFF → ACC, ON
    		Below 1 V → 10 to 14 V
    1I-9 - Body ground
    		Ignition switch is OFF → ON
    		Below 1 V → 10 to 14 V



NG
Go to step 5
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

5.INSPECT JUNCTION BLOCK NO. 2 (POWER SOURCE CIRCUIT)


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


    E068612E03

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    1A-1 - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
OK


6.INSPECT INSTRUMENT PANEL J/B ASSEMBLY


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


    E068613E02

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    1I-4 - Body ground
    		Always
    		10 to 14 V



NG
REPLACE INSTRUMENT PANEL J/B ASSEMBLY
OK


7.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

  1. Disconnect the 1F connector from the instrument panel junction block assembly.



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


    E068612E04

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    1F-10 - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.INSPECT IGNITION SWITCH


    E068971E01

  1. Disconnect the ignition switch connector.

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    2 - 3
    		Ignition switch OFF
    		10 kΩ or higher
    2 - 4
    		Ignition switch OFF
    		10 kΩ or higher
    2 - 3
    		Ignition switch ACC
    		Below 1 Ω
    2 - 4
    		Ignition switch ON
    		Below 1 Ω



NG
REPLACE IGNITION SWITCH
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - IGNITION SWITCH)