Headlight Signal Circuit

LIGHTING (EXT): AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL 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 (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Automatic Headlight

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

(a) Disconnect the 3D instrument panel junction block assembly connector.

(b) Disconnect the A34 headlight leveling ECU assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly Removal.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Removal

OK -- REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Removal