Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The air suspension module controls the air compressor relay by grounding circuit 420 (DB/YE), this engages the relay. Once engaged, fused battery voltage is supplied from battery junction box (BJB) fuse 112 (30A) to the relay along circuit 1053 (LB/PK), the voltage travels through the relay and to the air compressor motor along circuit 538 (PK). The motor is provided a ground path along circuit 57 (BK).