LIGHTING SYSTEM > IG Signal Circuit

for Preparation Click here


DESCRIPTION

This circuit detects the power switch on (IG) or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM


E220222E01


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Main Body / Data List.

  1. Read the display on the intelligent tester.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    IG SW
    		Power switch IG signal/ON or OFF
    		ON: Power switch on (IG)
    OFF: Power switch off
    		-

    OK:
    Normal conditions listed above are displayed.



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

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

  1. Disconnect the 2E*1 or 2F*2 and 2B instrument panel junction block assembly connectors.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    2E-1*1 - Body ground
    		Power switch off
    		11 to 14 V
    2F-1*2 - Body ground
    		Power switch off
    		11 to 14 V
    2B-25 - Body ground
    		Power switch on (IG)
    		11 to 14 V

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2B-4 - Body ground
    		Always
    		Below 1 Ω
    2B-6 - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO.1 RELAY)

  1. Remove the instrument panel junction block assembly (Click here).

  1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.



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


    E191508E02


    Standard Resistance:
    for LHD: 
    Tester Connection
    		Condition
    		Specified Condition
    2E-1 - A-32 (IG)
    		Always
    		10 kΩ or higher
    2E-1 - A-32 (IG)
    		Auxiliary battery positive (+) → 2B-25
    Auxiliary battery negative (-) → 2B-6
    Auxiliary battery negative (-) → 2B-4
    		Below 1 Ω
    for RHD: 
    Tester Connection
    		Condition
    		Specified Condition
    2F-1 - A-32 (IG)
    		Always
    		10 kΩ or higher
    2F-1 - A-32 (IG)
    		Auxiliary battery positive (+) → 2B-25
    Auxiliary battery negative (-) → 2B-6
    Auxiliary battery negative (-) → 2B-4
    		Below 1 Ω


    Text in Illustration 
    *a
    		Component with harness connected
    (Instrument panel junction block assembly)
    		*b
    		Component with harness connected
    (Instrument panel junction block assembly)
    *c
    		Component with harness connected
    (Instrument panel junction block assembly)
    		*d
    		for LHD
    *e
    		for RHD
    		-
    		-



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)