Wait to Start Indicator (Diesel only)
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The wait to start signal is transmitted to the instrument cluster via the SCP network from the PCM. The wait to start indicator will illuminate when the ignition switch is in the ON position with the engine OFF indicating that the glow plugs are heating.