Lexus IS250 IS220d GSE20 ALE20 - LIGHTING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

INSPECT FUSE (FR FOG)

CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - BATTERY)

CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 R/B - FOG LIGHT)

LIGHTING SYSTEM - Front Fog Light Circuit

DESCRIPTION

The front controller receives fog light switch information from the combination switch, and turns on the fog light.


WIRING DIAGRAM

Lighting System - Front Fog Light Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the intelligent tester main switch on.

Select the item below in the ACTIVE TEST and then check the front fog light operation.

ACTIVE TEST: Body No. 5 (Front Controller)
ItemTest DetailsDiagnostic Note
Front Fog Light RelayFront fog light relay ON / OFF-
  • OK:
  • Fog light illuminates.
NG
Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2.INSPECT FUSE (FR FOG)

Remove the FR FOG fuse from the engine room No. 2 relay block.

Measure the resistance of the fuse.

  • Standard resistance:
  • Below 1 Ω
NG
REPLACE FUSE
OK
3.CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 RELAY BLOCK - BATTERY)
Lighting System - Front Fog Light Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the 2E relay block connector.

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

  • Standard voltage:
  • Tester ConnectionConditionSpecified Condition
    2E-1 - Body groundAlways10 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 2 R/B - FOG LIGHT)
Lighting System - Front Fog Light Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Check the wire harness between the fog light (front LH) and engine room No. 2 relay block, and the fog light (front LH) and body ground.


Disconnect the 2G relay block connector.

Disconnect the B13 fog light connector.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    2G-7 - B13-2AlwaysBelow 1 Ω
    2G-7 or B13-2 - Body groundAlways10 kΩ or higher
    B13-1 - Body groundAlwaysBelow 1 Ω
Lighting System - Front Fog Light Circuit. LIGHTING. Lexus IS250 IS220d GSE20 ALE20

Check the wire harness between the fog light (front RH) and engine room No. 2 relay block, and the fog light (front RH) and body ground.


Disconnect the 2G relay block connector.

Disconnect the B1 fog light connector.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    2G-6 - B1-2AlwaysBelow 1 Ω
    2G-6 or B1-2 - Body groundAlways10 kΩ or higher
    B1-1 - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ENGINE ROOM NO. 2 R/B (FRONT CONTROLLER)
LEXUS IS250, IS220d / GSE20 ALE20
LIGHTING
Lexus IS250 IS220d GSE20 ALE20
LIGHTING SYSTEM