Normal Operation
WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
Under normal operation, when the Powertrain Control Module (PCM) receives an A/C request signal from the DATC module, the PCM provides a ground for the A/C clutch relay coil through circuit 91S-FA79 (BN/BL). The A/C clutch relay coil receives ignition voltage through circuit 15S-FA79 (GN/RD). The relay switch receives battery voltage through circuit 30-FA79 (RD/OG). When the relay coil is grounded, voltage is delivered through circuit 15-FA6 (GN/YE) to the A/C compressor clutch field coil. Ground for the A/C compressor clutch field coil is provided through circuit 31-FA6 (BK/YE).