2005 Mercury Grand Marquis Owner's Manuals

To see a clearer light pattern for
adjusting, you may want to block
the light from one headlamp while
adjusting the other.
5. Locate the vertical adjuster on
each headlamp. Usinga4mm
wrench, turn the adjuster either
clockwise (to adjust down) or
counterclockwise (to adjust up).
The horizontal edge of the brighter
light should touch the horizontal
reference line.
6. HORIZONTAL AIM IS NOT REQUIRED FOR THIS VEHICLE AND IS
NON-ADJUSTABLE.
7. Close the hood and turn off the lamps.
TURN SIGNAL CONTROL
•Push down to activate the left
turn signal.
•Push up to activate the right turn
signal.
The flash rate of the turn signal will speed up considerably if the left or
right turn lamp bulb (front or rear) is burned out.
Cornering lamps
When the turn signal is used and the headlamps are on, the cornering
lamps will light either the right or left side depending on the direction of
the turn.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
41

MAP/COURTESY LAMPS
The courtesy lamps light when:
•any door is opened.
•the instrument panel dimmer
switch is rotated past the detent.
•the UNLOCK control of the
remote entry controls is pressed
and the ignition is OFF.
The reading lamps can be turned on
by pressing the rocker controls next
to each lamp.
If equipped with Remote Keyless Entry, the courtesy lamp will illuminate
whenever any door is opened and will remain on for 25 seconds after the
door is shut or when the ignition is turned to the ON position.
With overhead console
With overhead console and moon
roof
To turn on the map lamps, press the
map lamp control.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
42

REAR COURTESY/READING LAMPS
Rotate the lens to illuminate the
lamp. With the lens in the flat
position, the courtesy lamp lights
when:
•Any door is opened.
•The panel dimmer thumbwheel is
rotated fully to the right past
detent.
BULB REPLACEMENT
Headlamp Condensation
The headlamps are vented to equalize pressure. When moist air enters
the headlamp(s) through the vents, there is a possibility that
condensation can occur. This condensation is normal and will clear
within 45 minutes of headlamp operation.
Replacing exterior bulbs
Check the operation of all the bulbs frequently.
Using the right bulbs
Replacement bulbs are specified in the chart below. Headlamp bulbs
must be marked with an authorized “D.O.T.” for North America and an
“E” for Europe to assure lamp performance, light brightness and pattern
and safe visibility. The correct bulbs will not damage the lamp assembly
or void the lamp assembly warranty and will provide quality bulb burn
time.
Function Trade Number
Headlamp 9007
Park, turn and sidemarker lamp (front) 3157 AK (amber)
Cornering lamp (front) 3156K
Tail, stop, turn and sidemarker lamp (rear) 3157K
Backup lamp 3156K
License plate lamp 168
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
43

Function Trade Number
High-mount brakelamp 912
Luggage compartment lamp 212-2
Rear reading lamp 578
Map lamp 906
Visor vanity lamp - Slide on Rail system
(SOR)37
Dual floorwell lamp 906
Glove compartment 168
All replacement bulbs are clear in color except where noted.
To replace all instrument panel lights - see your dealer.
Replacing the interior bulbs
Check the operation of all bulbs frequently.
Replacing headlamp bulbs
To remove the headlamp bulb:
1. Make sure the headlamp control is in the OFF position, then open the
hood.
2. Remove the three pin type retainers and the radiator sight shield.
3. Disconnect the electrical
connector.
4. Remove the headlamp retainer
bolts and the headlamp assembly.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
44

5. Remove the headlamp bulb
protective cover.
6. Remove the bulb retaining ring by
rotating it counterclockwise to free
it from the bulb socket and slide the
ring off of the plastic base. Keep the
ring to retain the new bulb.
7. Disconnect the electrical
connector from the bulb.
8. To install, reverse the removal
procedure. (Re-aiming the
headlamps may be necessary. For
additional information refer to the
headlamp aiming section of the
owner’s guide.)
Handle a halogen headlamp bulb carefully and keep out of
children’s reach. Grasp the bulb only by its plastic base and do
not touch the glass. The oil from your hand could cause the bulb to
break the next time the headlamps are operated.
Note:If the bulb is accidentally touched, it should be cleaned with
rubbing alcohol before being used.
Note:The headlamp bulb should not be removed from the headlamp
until just before a replacement bulb is installed. Removing the bulb for
an extended period of time may affect headlamp bulb performance.
Contaminants may enter the headlamp where they can settle on the lens
and reflector. Never turn the headlamps on with the bulb removed.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
45

Replacing front parking/cornering/turn signal lamp bulbs
The park/turn/cornering lamp bulbs can be replaced without removing
the headlamp assembly.
1. Make sure headlamp switch is in OFF position, then open the hood.
2. Remove the three pin type retainers and the radiator shield.
3. Loosen the parking lamp attachments, on the back side of the lamp,
and pull the lamp assembly forward.
4. Remove the bulb from the side turn lamp assembly.
5. Disconnect the electrical connector from the bulb and replace the
bulb.
Note:The parking lamp/turn signal bulbs should not be removed from
the lamp until just before a replacement bulb is installed. Removing the
bulb for an extended period of time may affect headlamp bulb
performance. Contaminants may enter the headlamp where they can
settle on the lens and reflector. Never turn the lamps on with the bulb
removed.
6. To install, reverse the order of the removal procedure.
Replacing tail lamp/brake/turn lamp bulbs
The tail lamp, the brake lamp and the turn signal lamp bulbs are located
in the tail lamp assembly. Follow the same steps to replace either bulb.
1. Make sure headlamp switch is in
OFF position, then open the trunk
and remove plastic retainer to
expose the lamp assembly hardware.
2. Carefully pull the carpet away to
expose the plastic retainer.
3. Remove three nut and washer
assemblies and the lamp assembly
from the vehicle.
4. Remove the bulb socket by
rotating it counterclockwise, then
pulling it out of the lamp assembly.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
46

5. Pull the bulb from the socket and
push in the new bulb.
6. Install the bulb socket into the
lamp assembly by rotating it
clockwise.
7. Install the lamp assembly on the
vehicle with three nut and washer
assemblies ensuring the washers on
the nuts are flush with the body to prevent water from entering the
trunk.
8. Install the plastic retainer and carefully push the carpet back in to
place.
Replacing license plate lamp bulbs
1. Make sure headlamp switch is in
OFF position, then remove two
screws, grommets and the license
plate lamp assembly from the trunk
lid.
2. Carefully pull the bulb from the
socket and push in the new bulb.
3. Install the lamp assembly on
trunk lid with two grommets,
ensuring the grommets are pushed
all the way in to the trunk lid and secure with two screws.
Replacing backup lamp bulbs
1. Make sure headlamp switch is in
OFF position, then open trunk and
remove bulb socket from the trunk
lid by turning counterclockwise.
2. Pull the bulb straight out of the
socket and push in the new bulb.
3. Install the bulb socket in trunk lid
by turning clockwise.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
47

Replacing high-mount brakelamp bulbs
1. Make sure headlamp switch is in
OFF position, then remove two
screws from the lamp assembly.
2. Carefully lift the lamp assembly
up for access to the bulbs.
3. Carefully pull the bulb socket out
of the lamp assembly.
4. Pull the bulb straight out of the
socket and push in the new bulb.
To install, reverse the removal
procedure.
Overhead console lamps
To remove and replace the lamps in the overhead console:
1. Make sure the headlamp switch is
in the OFF position and remove the
overhead console from the headliner
by pulling it straight down.
2. Remove the bulb socket from the
back of the lamp housing by pulling
it straight out.
3. Remove the bulb from the socket
by pulling straight out.
Install the new bulb in reverse order.
2005 Grand Marquis(grn)
Owners Guide (post-2002-fmt)
USA(fus)
Lights
48