Normal Operation
WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
Under normal operation, the air inlet door actuator motor is supplied voltage or ground on circuit 1991 (LB/WH), depending on desired actuator rotation, by the EMTC module or EATC module. The EMTC module or EATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit 1990 (WH/LB).