There should be a relay control unit attached to the front radiator support. It is near the air bag crash sensor(which has green colored bolts securing it. The relay controller is near the battery side of the vehicle.The connector holds about 20 wires. If you are having an issue with other items driven by this unit, you should check the connectors at the battery. There should be a couple of two wires connectors right very close to the battery positive post, and corrosion gets into the connector and creates a high resistance condition and this can cause lack power to many systems and if not caught first, lots of changing of good parts. Good luck.