Ford 1998 Crown Victoria Owner's Manual page 52

Controls and features
The inside lights will not turn off if:
they have been turned on with the dimmer control or
any door is open.
The battery saver will shut off the interior lamps 30 minutes after the
last door is closed or after 10 minutes if the door is left open.
Replacing the battery
The transmitter is powered by one coin type three-volt lithium battery
CR2032 or equivalent. Typical operating range will allow you to be up to
10 meters (33 feet) away from your vehicle. A decrease in operating
range can be caused by:
battery weakness due to time and use
weather conditions
nearby radio towers
structures around the vehicle
other vehicles parked next to the vehicle
To replace the battery:
1. Twist a thin coin between the two
halves of the transmitter near the
key ring. DO NOT TAKE THE
FRONT PART OF THE
TRANSMITTER APART.
2. Place the positive (+) side of new
battery in the same orientation.
Refer to the diagram inside the
transmitter unit.
3. Snap the two halves back
together.
Replacement of the battery will not cause the remote transmitter to
become deprogrammed from your vehicle. The remote transmitter should
operate normally after battery replacement.
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