Circuit Description
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Battery voltage is supplied directly to the after blow relay directly through the underhood fuse block. The body control module (BCM), provides the ground to enable the after blow operation through the blower motor relay control circuit. The after blow relay control circuit and relay are retailer installed. The BCM provides logic to enable the blower based on information from the engine control module (ECM). The duration of the after blow relay cycle is determined by A/C operation, ambient air temperature and vehicle speed.