Service Soon Warning Indicator
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The service soon warning indicator informs the driver that vehicle service is required. The input to the instrument cluster is over the communication network from the PCM, the TBCM, the TCM, and the power steering control module (PSCM).