Lighting System Step Illumination Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Lighting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OPERATION OF FOOT LIGHT

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT FUSE (DOME, D/C CUT)

REPLACE FOOT LIGHT (LH)

CHECK WIRE HARNESS (FOOT LIGHT (LH) - BATTERY)

CHECK WIRE HARNESS (FOOT LIGHT (LH) - MULTIPLEX NETWORK BODY ECU)

REPLACE FOOT LIGHT (RH)

CHECK WIRE HARNESS (FOOT LIGHT (RH) - BATTERY)

CHECK WIRE HARNESS (FOOT LIGHT (RH) - MULTIPLEX NETWORK BODY ECU)

REPLACE FOOT LIGHT (REAR LH)

CHECK WIRE HARNESS (FOOT LIGHT (REAR LH) - BATTERY)

CHECK WIRE HARNESS (FOOT LIGHT (REAR LH) - MULTIPLEX NETWORK BODY ECU)

REPLACE FOOT LIGHT (REAR RH)

CHECK WIRE HARNESS (FOOT LIGHT (REAR RH) - BATTERY)

CHECK WIRE HARNESS (FOOT LIGHT (REAR RH) - MULTIPLEX NETWORK BODY ECU)

LIGHTING SYSTEM - Step Illumination Circuit


DESCRIPTION

The multiplex network body ECU receives information regarding the door lock position switch and engine switch, and turns on each step light. It also receives shift information and controls the illumination.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit


INSPECTION PROCEDURE

1.CHECK OPERATION OF FOOT LIGHT

  1. When a door is opened, check that the appropriate light illuminates.

    Result:

    Result
    		Proceed to
    All lights do not illuminate
    		A
    Foot light (LH) does not illuminate
    		B
    Foot light (RH) does not illuminate
    		C
    Foot light (Rear LH) does not illuminate
    		D
    Foot light (Rear RH) does not illuminate
    		E


B
Go to step 4

C
Go to step 7

D
Go to step 10

E
Go to step 13
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the step light illuminates.

    Multiplex network body ECU :

    Item
    		Test Details
    		Diagnostic Note
    Step Light Operation
    		Step light operation ON / OFF
    		-
    OK:
    Step light illuminates.


NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3.INSPECT FUSE (DOME, D/C CUT)

  1. Remove the DOME fuse from the engine room No. 1 relay block.

  1. Remove the D/C CUT fuse from the engine room No. 1 relay block.

  1. Measure the resistance of the fuses.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4.REPLACE FOOT LIGHT (LH)

  1. Temporarily replace the foot light (LH) with a new or normally functioning one.

  1. Check that the foot light illuminates.

    OK:
    Foot light illuminates.


OK
END
NG


5.CHECK WIRE HARNESS (FOOT LIGHT (LH) - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the L17 light connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    L17-2 - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


6.CHECK WIRE HARNESS (FOOT LIGHT (LH) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the L17 light connector.

  1. Disconnect the L68 ECU connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    L17-1 - L68-15 (FSPT)
    		Below 1 Ω
    L17-1 or L68-15 (FSPT) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

7.REPLACE FOOT LIGHT (RH)

  1. Temporarily replace the foot light (RH) with a new or normally functioning one.

  1. Check that the foot light illuminates.

    OK:
    Foot light illuminates.


OK
END
NG


8.CHECK WIRE HARNESS (FOOT LIGHT (RH) - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the L49 light connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    L49-2 - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


9.CHECK WIRE HARNESS (FOOT LIGHT (RH) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the L49 light connector.

  1. Disconnect the L68 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    L49-1 - L68-15 (FSPT)
    		Below 1 Ω
    L49-1 or L68-15 (FSPT) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

10.REPLACE FOOT LIGHT (REAR LH)

  1. Temporarily replace the foot light (rear LH) with a new or normally functioning one.

  1. Check that the foot light illuminates.

    OK:
    Foot light illuminates.


OK
END
NG


11.CHECK WIRE HARNESS (FOOT LIGHT (REAR LH) - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the d12 light connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    d12-2 - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


12.CHECK WIRE HARNESS (FOOT LIGHT (REAR LH) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the d12 light connector.

  1. Disconnect the L68 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    d12-1 - L68-15 (FSPT)
    		Below 1 Ω
    d12-1 or L68-15 (FSPT) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

13.REPLACE FOOT LIGHT (REAR RH)

  1. Temporarily replace the foot light (rear RH) with a new or normally functioning one.

  1. Check that the foot light illuminates.

    OK:
    Foot light illuminates.


OK
END
NG


14.CHECK WIRE HARNESS (FOOT LIGHT (REAR RH) - BATTERY)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the c12 light connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    c12-2 - Body ground
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


15.CHECK WIRE HARNESS (FOOT LIGHT (REAR RH) - MULTIPLEX NETWORK BODY ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Step Illumination Circuit

  1. Disconnect the c12 light connector.

  1. Disconnect the L68 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    c12-1 - L68-15 (FSPT)
    		Below 1 Ω
    c12-1 or L68-15 (FSPT) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE