Glow Plug Indicator
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The glow plug indicator is located in the instrument panel cluster and informs the operator when the engine is ready to be started. The indicator is controlled by the instrument panel cluster based on an electronic command signal from the PCM through the CAN. The on-time of the indicator is independent of the glow plug relay on-time. As a prove out, the indicator is commanded on at every key cycle even though the glow plug system may not be operating.