A/C Cycling Switch

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Some applications do not have a dedicated (separate) input to PCM indicating that A/C is requested. This information is received by PCM through Standard Corporate Protocol (SCP) BUS (+) and BUS (-) circuits.

The A/C Cycling Switch (ACCS) may be wired to either the ACCS or ACPSW PCM input. When the A/C cycling switch opens, the PCM will turn off the A/C clutch.

The ACCS circuit to the PCM provides a voltage signal which indicates when the A/C is requested. When the A/C demand switch is turned on, and both the A/C cycling switch and the high pressure contacts of the A/C high pressure switch (if equipped and in circuit) are closed, voltage is supplied to the ACCS circuit at the PCM. See WIRING DIAGRAMS .

If the ACCS signal is not received by the PCM, the PCM circuit will not allow the A/C to operate. For additional information, see WIDE OPEN THROTTLE A/C CUT-OFF RELAY under PCM OUTPUTS.

Some applications do not have a dedicated (separate) input to the PCM indicating that A/C is requested. This information is received by the PCM through the BUS + and BUS - (SCP) communication.