Headlight Signal Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Headlight Signal Circuit
- Headlight Signal Circuit

DESCRIPTION

The headlight leveling ECU assembly detects the status of the low beam headlights.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
First check that the low beam headlights operate normally.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / HL Auto Leveling / Data List.

(e) Read the display on the Techstream.

HL Auto Leveling





OK:

Normal conditions listed above are displayed.

NG -- CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU)

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

2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU)

(a) Disconnect the A48 headlight leveling ECU assembly connector.





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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Components