Normal Operation
WARNING: This page is about a different car, the 2006 Lincoln Navigator and 2006 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Under normal operation, when the ignition switch is placed in the START position, voltage is supplied from circuit 1050 (LG/PK), through circuit 32 (RD/LB)/33 (WH/PK) to the digital transmission range (TR) sensor. In PARK or NEUTRAL, voltage is supplied from the TR sensor through circuit 1093 (TN/RD) to the starter relay coil. The starter relay coil is supplied ground from the PCM through circuit 325 (DB/OG). When the starter relay is energized, voltage supplied to the relay switch is sent to the starter motor solenoid through circuit 113 (YE/LB). Battery voltage is supplied to the starter motor through circuit 2037 (RD) at all times.