Lighting System (For Hatchback) Ig Signal Circuit

Vehicle Interior. Yaris. Ncp93, 131
Lighting (Int). Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM

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

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

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

REPLACE MAIN BODY ECU

READ VALUE USING TECHSTREAM

LIGHTING SYSTEM (for Hatchback) - IG Signal Circuit


DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU.

WIRING DIAGRAM


Yaris. Ncp93, 131.Lighting (Int).Lighting System (For Sedan).Lighting System (For Hatchback) Ig Signal 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
    IG SW
    		Ignition switch ON signal /
    OFF or ON
    		OFF: Ignition switch ACC or off
    ON: Ignition switch ON
    		-
    OK:
    Normal conditions listed above are displayed.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (YARIS_NCP93 RM000002WKO01LX.html)

2.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY AND BODY GROUND)
Yaris. Ncp93, 131.Lighting (Int).Lighting System (For Sedan).Lighting System (For Hatchback) Ig Signal Circuit

  1. Disconnect the 3E and 3B instrument panel junction block assembly connectors.

  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
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3B-8 - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Instrument Panel Junction Block Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - IGNITION SWITCH)


    Yaris. Ncp93, 131.Lighting (Int).Lighting System (For Sedan).Lighting System (For Hatchback) Ig Signal Circuit

  1. Reconnect the instrument panel junction block assembly connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3A-29 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (Instrument Panel Junction Block Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  1. Disconnect the 3A instrument panel junction block assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-40 - 3A-54
    		Always
    		Below 1 Ω
    3A-40 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE MAIN BODY ECU

  1. Replace the main body ECU (YARIS_NCP93 RM000003TOE00CX.html).


NEXT


6.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
    IG SW
    		Ignition switch ON signal /
    OFF or ON
    		OFF: Ignition switch ACC or off
    ON: Ignition switch ON
    		-
    OK:
    Normal conditions listed above are displayed.


NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

END (MAIN BODY ECU WAS DEFECTIVE)