Ford 1999 Wagon-Econoline Owner's Manual page 70

Controls and features
Illuminated entry
The interior lamps illuminate when the remote entry system is used to
unlock the door(s) or sound the personal alarm.
The system automatically turns off after 25 seconds or when the ignition
is turned to the RUN or ACC position. The dome lamp control
(if equipped) must not be set to the OFF position for the illuminated
entry system to operate.
The inside lights will not turn off if:
• they have been turned on with the dimmer control or
• any door is open.
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