Replacing Exterior Bulbs; Replacing Headlamp Bulbs; To Remove The Headlamp Bulb - Mercury 2000 Grand Marquis Owner's Manual

If the vehicle's powertrain system or its battery has just been serviced,
the on-board diagnostics system is reset to a "not ready for I/M test"
condition. To ready the on-board diagnostics system for I/M testing, a
minimum of 30 minutes of city and highway driving is necessary as
described below:
First, at least 10 minutes of driving on an expressway or highway.
Next, at least 20 minutes driving in stop-and-go, city-type traffic with
at least four idle periods.
Allow the vehicle to sit for at least eight hours without starting the
engine. Then, start the engine and complete the above driving cycle. The
engine must warm up to its normal operating temperature. Once started,
do not turn off the engine until the above driving cycle is complete.
BULBS

Replacing exterior bulbs

Check the operation of the following lamps frequently:
Headlamps
Tail lamps
Brakelamps
High-mount brakelamp
Turn signals
Backup lamps
License plate lamp
Do not remove lamp bulbs unless they will be replaced immediately. If a
bulb is removed for an extended period of time, contaminants may enter
the lamp housings and affect performance.

Replacing headlamp bulbs

To remove the headlamp bulb:

1. Make sure headlamp switch is in OFF position, then open the hood.
2. Remove the protective cover by turning the three knobs to the unlock
position.
Maintenance and care
185