Lighting System Headlight Signal Circuit

Vehicle Exterior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Lighting (Ext). Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT)

INSPECT HEADLIGHT RELAY (HEAD LO)

CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [HEAD LO])

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD LO] - MAIN BODY ECU [COWL SIDE JUNCTION BLOCK LH])

LIGHTING SYSTEM - Headlight Signal Circuit


DESCRIPTION

The main body ECU receives a headlight low switch information signal from the light control switch, and illuminates the headlight low beam.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System.Lighting System Headlight Signal Circuit


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System.Lighting System Headlight Signal Circuit


Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System.Lighting System Headlight Signal Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT)

  1. Using the intelligent tester, perform the Active Test (Click here).

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Headlight Relay
    		Headlight
    		ON or OFF
    		-
    OK:
    Headlight low beam turns on/turns off.


NG
Go to step 2
OK

REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

2.INSPECT HEADLIGHT RELAY (HEAD LO)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System.Lighting System Headlight Signal Circuit

  1. Remove the headlight relay from the engine room relay block, junction block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage not applied to terminals 1 and 2
    		10 kΩ or higher
    Battery voltage applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE HEADLIGHT RELAY (HEAD LO)
OK


3.CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [HEAD LO])


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Lighting (Ext).Lighting System.Lighting System Headlight Signal Circuit

  1. Remove the headlight relay from the engine room relay block, junction block.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    Headlight relay terminal 1 - Body ground
    		Always
    		11 to 14 V
    Headlight relay terminal 5 - Body ground
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Headlight Relay [HEAD LO])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD LO] - MAIN BODY ECU [COWL SIDE JUNCTION BLOCK LH])

  1. Remove the headlight relay from the engine room relay block, junction block.

  1. Disconnect the 2B main body ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Headlight relay terminal 2 - 2B-18
    		Always
    		Below 1 Ω
    Headlight relay terminal 2 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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