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Home >> Lexus >> 2012 >> IS 250C V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Lighting and Horns >> Testing and Inspection >> Component Tests and General Diagnostics >> Exterior Lighting System >> Headlight Leveling ECU Power Source Circuit
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Headlight Leveling ECU Power Source Circuit





LIGHTING (EXT): LIGHTING SYSTEM: Headlight Leveling ECU Power Source Circuit
- Headlight Leveling ECU Power Source Circuit

DESCRIPTION

This circuit is used to detect the on (IG) state of the power source circuit. The headlight leveling ECU assembly receives a signal from the LH-IG1 relay.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (H-LP LVL)

(a) Remove the H-LP LVL fuse from the cowl side junction block LH.

(b) Measure the resistance of the fuse.

Standard Resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the A59 headlight leveling ECU assembly connector.

(b) Measure the voltage and resistance of the wire harness side connector.

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Exterior Lighting System
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