Headlight Beam Level Control ECU Communication Circuit: Description
WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Cowl side junction block ECU LH receives error signals from the headlight leveling system. It also sends generator terminal signal to headlight beam level control ECU. The headlight beam level control ECU also receives vehicle speed signal from skid control ECU with actuator (3GR-FSE) or skid control ECU (3UZFE), thus controlling headlight beam level control motor.