Lighting System Interior Light Switch Signal Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ROOM LIGHT SWITCH)

INSPECT ROOM LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ROOM LIGHT SWITCH ASSEMBLY - MAIN BODY ECU, DRIVER SIDE JUNCTION BLOCK AND BODY GROUND)

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY

LIGHTING SYSTEM - Interior Light Switch Signal Circuit


DESCRIPTION

The main body ECU detects the condition of the interior light switch.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Int).Lighting System.Lighting System Interior Light Switch Signal Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (ROOM LIGHT SWITCH)

  1. Using the intelligent tester, read the Data List (LandCruiser RM000000PKV0J5X.html).

    Main Body
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Lounge Illumination Value SW (UP)
    		Room light switch (up) signal / ON or OFF
    		ON: Room light switch (up) on
    OFF: Room light switch (up) off
    		-
    Lounge Illumination Value SW (Dwn)
    		Room light switch (down) signal / ON or OFF
    		ON: Room light switch (down) on
    OFF: Room light switch (down) off
    		-
    OK:
    Switch condition is displayed.


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000002CE20QGX.html)

2.INSPECT ROOM LIGHT SWITCH ASSEMBLY


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Int).Lighting System.Lighting System Interior Light Switch Signal Circuit

  1. Remove the room light switch (LandCruiser RM000003SAI02SX.html).

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3 (UP) - 4 (E)
    		Room light switch up
    		Below 1 Ω
    Room light switch off
    		10 kΩ or higher
    2 (DOWN) - 4 (E)
    		Room light switch down
    		Below 1 Ω
    Room light switch off
    		10 kΩ or higher


NG
REPLACE ROOM LIGHT SWITCH ASSEMBLY (LandCruiser RM000003SAI02SX.html)
OK


3.CHECK HARNESS AND CONNECTOR (ROOM LIGHT SWITCH ASSEMBLY - MAIN BODY ECU, DRIVER SIDE JUNCTION BLOCK AND BODY GROUND)

  1. Disconnect the G124 room light switch connector.

  1. Disconnect the 2D driver side junction block connector.

  1. Disconnect the G63 main body ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G124-3 (UP) - G63-5 (ILUP)
    		Always
    		Below 1 Ω
    G124-2 (DOWN) - 2D-13
    		Always
    		Below 1 Ω
    G124-4 (E) - Body ground
    		Always
    		Below 1 Ω
    G124-3 (UP) or G63-5 (ILUP) - Body ground
    		Always
    		10 kΩ or higher
    G124-2 (DOWN) or 2D-13 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Int).Lighting System.Lighting System Interior Light Switch Signal Circuit

  1. Disconnect the 2D driver side junction block connector.

  1. Remove the main body ECU (LandCruiser RM000003WBO05FX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2D-13 - A-18 (ILDN)
    		Always
    		Below 1 Ω
    2D-13 - Body ground
    		Always
    		10 kΩ or higher
Text in Illustration
*a
Front view of wire harness connector
(to Driver Side Junction Block Assembly)
*b
Front view of wire harness connector
(to Main Body ECU)


NG
REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY (LandCruiser RM000003WBO05FX.html)
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)