FORD 2013 Explorer v.2 - Manual (Page 113)

WARNING: Driving a vehicle with the brake system warning
light on is dangerous. A significant decrease in braking
performance may occur. It will take you longer to stop the vehicle.
Have the vehicle checked by your authorized dealer as soon as possible.
Driving extended distances with the parking brake engaged can cause
brake failure and the risk of personal injury.
Charging system (RTT)
Illuminates when the battery is not charging properly. If it stays
on while the engine is running, there may be a malfunction with
the charging system. Contact your authorized dealer as soon as
possible. This indicates a problem with the electrical system or a related
component.
Door ajar (RTT)
Displays when the ignition is on and any door is not completely
closed.
Engine oil pressure (RTT)
Illuminates when the oil pressure falls below the normal range.
Engine coolant temperature (RTT)
Illuminates when the engine coolant temperature is high. Stop
the vehicle as soon as possible, switch off the engine and let
cool.
Fog lamps
Illuminates when the fog lamps are turned on.
Instrument Cluster 113
2013 Explorer (exp)
Owners Guide gf, 2nd Printing
USA (fus)