Impreza Headlights

You may receive a customer complaint of Impreza headlights dimming at idle. Do not attempt repair. This is a normal condition. The generator incorporates an IC regulator which features a "load response control". The load response control circuit function is to gradually increase the generator output when an additional electric load, such as headlights or blower fan, is applied to the engine in the idling state. This prevents a sharp drop in engine idling speed and ensures an improved comfort while the engine is idling. Refer to the Impreza Service Manual, Section 6-1, page 2 (MI-0).