Lighting System Rear Fog Light Circuit

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20
Lighting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT FUSE (RR FOG)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BATTERY)

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND)

LIGHTING SYSTEM - Rear Fog Light Circuit


DESCRIPTION

The main body ECU LH receives rear fog light switch information from the combination switch, and turns on the rear fog lights.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Lighting.Lighting System.Lighting System Rear Fog Light Circuit


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the intelligent tester main switch on.

  1. Select the item below in the Active Test and then check the rear fog light operation.

    ACTIVE TEST: Body No. 3 (Main Body ECU LH)
    Item
    		Test Details
    		Diagnostic Note
    Rear fog light
    		Rear fog light ON / OFF
    		-
    OK:
    Rear fog lights illuminate.


NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2.INSPECT FUSE (RR FOG)

  1. Remove the RR FOG fuse from the No. 1 junction block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.Lighting.Lighting System.Lighting System Rear Fog Light Circuit

  1. Disconnect the LM junction block connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    LM-1 (RFRL) - Body ground
    		Always
    		10 to 14 V


OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Lighting.Lighting System.Lighting System Rear Fog Light Circuit

  1. Disconnect the LJ junction block connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    LJ-25 - Body ground
    		Light control switch HEAD and rear fog light switch ON
    		10 to 14 V


OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE MAIN BODY ECU LH (COWL SIDE J/B LH)