Lighting System Taillight Relay Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TAILLIGHT RELAY)

CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)

INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY

LIGHTING SYSTEM - Taillight Relay Circuit


DESCRIPTION

The main body ECU receives headlight dimmer switch information signals and illuminates the clearance lights, taillights and license plate lights.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Taillight Relay 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 (TAILLIGHT RELAY)

  1. Using the intelligent tester, perform the Active Test (LandCruiser RM000000PKV0J6X.html).

    Main Body
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Taillight Relay
    		Taillight relay
    		ON/OFF
    		-
    OK:
    Taillight relay operates (taillights illuminate).


NG
Go to step 2
OK

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

2.CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Taillight Relay Circuit

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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A-14(TRLY) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Main Body ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Lighting (Ext).Lighting System.Lighting System Taillight Relay Circuit

  1. Remove the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).

  1. Remove the main body ECU from the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A-14(TRLY) - 2K-1
    		Always
    		Below 1 Ω


NG
REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000002CE20QHX.html)