Headlight Beam Level Control ECU Communication Circuit

LIGHTING SYSTEM: Headlight Beam Level Control ECU Communication Circuit

Headlight Beam Level Control ECU Communication Circuit

DESCRIPTION

Body ECU sends signals that the headlight is ON and the daytime running light is on to the headlight beam level control ECU and operates the headlight beam level control system.
Headlight beam level control ECU receives the vehicle speed signal from the skid control ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - HEADLIGHT BEAM LEVEL CONTROL ECU)





(a) Disconnect the 1D connector of instrument panel junction block assembly and the H17 connector of headlight beam level control ECU.
(b) Measure the resistance according to the value(s) in the table below.





Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - HEADLIGHT BEAM LEVEL CONTROL ECU)





(a) Disconnect the connectors from the skid control ECU and the headlight beam level control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE