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Old 11-23-2005, 22:01   #1 (permalink)
Thundaar
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Where is the diversity antenna?

I have a Lincoln TownCar Signature (03) and the radio keeps cutting in and
out randomly. The Cd works just fine all the time. The radio goes to pure
static, then will work 95% static free for a day or so then static again.
I think it may be the antenna connection, but I can't seem to find the
diversity antenna to check it? I just had the center brake light replaced
because of a bad bulb. Could it be there and it wasn't connected
properly?
HELP! where is it?

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Old 11-24-2005, 08:01   #2 (permalink)
C. E. White
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Re: Where is the diversity antenna?


"Thundaar" <allied77@verizon.net> wrote in message
news:e5cbd6c972307e1af417865aa052e84e@localhost.talkaboutautos.com...
>I have a Lincoln TownCar Signature (03) and the radio keeps cutting in and
> out randomly. The Cd works just fine all the time. The radio goes to pure
> static, then will work 95% static free for a day or so then static again.
> I think it may be the antenna connection, but I can't seem to find the
> diversity antenna to check it? I just had the center brake light replaced
> because of a bad bulb. Could it be there and it wasn't connected
> properly?
> HELP! where is it?


Components -

1 - AM/FM antenna (in rear glass)
2 - Radio antenna module power lead (feeds filter module located under rear
package tray)
3 18C847 Radio antenna module (under headlinder above rear window)
4 18812 Radio antenna lead-in cable - rear (part of wiring harness 14A005 -
attaches to antenna module)
5 18812 Radio antenna lead-in cable - front (connect rear cable to radio)
6 - Radio chassis
7 18K891 Filter module - radio antenna (vehicles built after 12/02 - located
under rear package tray)
8 - Rear window defroster grid power lead (vehicles built after 12/02 - also
attaches to filter module)

The filter module is located on the passenger side of the rear package tray,
underneath the package tray trim panel. It is connected in line to the power
leads, from the body main wiring harness that supplies power to the antenna
module and the rear window defroster grid.

The antenna is concealed on the inside of the rear window glass. The AM/FM
antenna is the conductive tracing above the rear window defroster grid.

The radio antenna uses an antenna module mounted under the headliner above
the back window glass to provide optimal AM/FM signals to the radio input.

The radio antenna uses a two piece coaxial cable to connect the radio
chassis to the antenna module. The front antenna lead in cable is connected
to the radio chassis and has an in line connector at the RH cowl side. The
rear antenna cable connects at the RH cowl side and runs along the rocker
panel within the body main wiring (14A005) harness. It separates from the
harness at the quarter panel and runs up the right C-pillar to the headliner
where it connects to the antenna module. A third cable, integral to the
antenna module, connects the AM/FM antenna to the antenna module at the
upper right side of the rear window.

Antenna
Removal and Installation
The antenna is integral to the back window glass and can be repaired, but
not installed separately. For removal and installation of the back window
glass, refer to Section 501-11 . For repair procedures, refer to Antenna
Grid Wire Repair in this section.

Antenna -Filter Module
1 -Remove the rear seat backrest. For additional information, refer to
Section 501-10 .
2 - Remove the pin-type retainers and the RH C-pillar lower trim panel.
3 - Position aside the rear door weatherstrip.
4 - Disengage the four retaining clips and position the RH roof side rear
trim panel aside.
5 - Remove the package tray trim panel.
6 - Remove the filter module bolts.
7 - Disconnect the two filter module connectors.
8 - Remove the filter module.
To install, reverse the removal procedure.

Antenna -Isolator Module
Removal and Installation
NOTE: The AM/FM antenna cable is integral to the radio antenna module, and
is not repaired separately.
1 - Remove the RH C-pillar trim panel. For additional information, refer to
Section 501-05 .
2 - Lower the right rear corner of the headliner. For additional
information, refer to Section 501-05 .
3 - Position the radio antenna module aside.
4 - Remove the bolt.
5 - Disconnect the rear antenna lead-in cable and the antenna module power
lead electrical connectors.
6- Remove the radio antenna module and the AM/FM antenna cable.
7 - Disconnect the AM/FM antenna cable.
8 - To install, reverse the removal procedure.

Antenna Lead-In Cable -Front
Removal and Installation
1 - Remove the audio unit. For additional information, refer to Section
415-01 .
2 - Remove the RH lower A-pillar trim panel.
3 - Position the RH lower instrument panel cover aside.
4 - Remove the pin-type retainers.
5 - Position the lower instrument panel cover aside.
6 - Disconnect the RH lower instrument panel cover light and remove the RH
lower instrument panel cover.
7 - Disconnect the antenna lead-in cable.
8 - Remove the antenna lead-in cable.
9 - Remove the five clips.
10- Remove the antenna lead-in cable.
To install, reverse the removal procedure.

Antenna Lead-In Cable -Rear
Removal and Installation
CAUTION: The antenna lead-in cable is not removable from the wiring
harness. If a new cable needs to be installed, leave it in the wiring
harness. Install the new cable on top of the body main wiring harness and
secure with wire ties. Do not cut into the wiring harness to remove the
existing antenna lead-in cable.
1 - Disconnect the battery ground cable. For additional information, refer
to Section 414-01 .
2 - Remove the RH C-pillar trim panel. For additional information, refer to
Section 501-05 .
3 - Remove the RH lower C-pillar trim panel.
4 - Remove the pin-type retainers.
5 - Disconnect the antenna lead-in cable.
6 - Remove the RH lower A-pillar trim panel.
7 - Remove the RH B-pillar trim panel. For additional information, refer to
Section 501-05 .
8 - Disconnect the antenna lead-in cable.
CAUTION: The antenna lead-in cable is not removable from the wiring harness.
If a new cable is being installed, leave it in the wiring harness. Install a
new cable on top of the body main wiring harness and secure with wire ties.
Do not cut into the wiring harness to remove the existing antenna lead-in
cable. Tie back or insulate the old cable ends to keep them from causing
noise.
9 -Install the new antenna lead-in cable on top of the old one and secure
with wire ties.
10 - Install the new antenna lead-in cable in the wiring harness conduit
along the rocker panel.
11 - Connect the antenna lead-in cable.
12 - Install the RH B-pillar trim panel. For additional information, refer
to Section 501-05 .
13 - Install the RH lower A-pillar trim panel.
14 - Install the RH lower C-pillar trim panel.
15 - Position the lower C-pillar trim panel.
16 - Install the pin-type retainers.
17 - Install the RH C-pillar trim panel. For additional information, refer
to Section 501-05 .
18 - Connect the battery ground cable. For additional information, refer to
Section 414-01 .

Antenna Grid Wire Repair

Special Tool(s) Heat Gun
107-R0300 or equivalent

Material Item Specification
Rear Window Defroster Repair Kit
D8A2-19562-AA WSB-M4J58-B

NOTE: Any breaks longer than 25.4 mm (1 in) in one grid cannot be repaired.
A new back window glass must be installed. Breaks equal to or shorter than
25.4 mm (1 in) in the window grid wire can be successfully repaired by using
the following procedure:
NOTE: Optimum hardness and adhesion will occur after 24 hours. Do not
disturb the repaired area until that time.
1 - Obtain a grid wire repair repair kit (D8A2-19562-AA) meeting Ford
specification WSB-M4J58-B.
2 - The vehicle should be brought inside and allowed to reach 16C (60F) or
above.
3 - Clean the repair area with denatured alcohol.
4 - Place the grid line mask over the break aligning the cut out slots on
either side of the repair area.
5 - Apply the repair material to the repair area.
6 - Remove the mask without disturbing the repair.
7 - Use the Heat Gun to heat the repair area for one to two minutes at a
distance of about 25-50 mm (1-2 in). This procedure should heat the repair
area to approximately 149C (300F)

E8 CHECK ANTENNA FOR DAMAGE
Key in OFF position.
Disconnect: Antenna Lead Terminal.
Measure the resistance between the antenna cable lead terminal and the end
of the antenna grid wire.
Is the resistance less than 8 ohms?
Yes
GO to E9 .

No
REPAIR the antenna. REFER to Section 415-02 .

E9 CHECK VOLTAGE TO ANTENNA MODULE
Disconnect: Antenna Module C301.
Key in ON position.
Measure the voltage between the antenna module C301 pin , circuit 1523 (DG),
harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to E10 .

No
REPAIR the circuit. TEST the system for normal operation.
E10 SUBSTITUTE ANTENNA MODULE
Key in OFF position.
Substitute a known good antenna module.
Key in START position.
Check the operation of the audio unit.
Is the noise eliminated?
Yes
INSTALL a new antenna module. REFER to Section 415-02 . TEST the system for
normal operation.

No
GO to E11 .
E11 SUBSTITUTE ANTENNA EXTENSION CABLE(S)
Key in OFF position.
Substitute a known good antenna cable(s) between the antenna module and the
audio unit.
Key in START position.
Check the operation of the audio unit.
Is the noise eliminated?
Yes
INSTALL a new antenna cable. REFER to Section 415-02 . TEST the system for
normal operation.

No
REINSTALL the original antenna cable. REMOVE the audio unit and SEND it to
an authorized audio system repair facility. REFER to Section 415-01 . TEST
the system for normal operation.


Ed


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Old 11-24-2005, 08:01   #3 (permalink)
lugnut
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Posts: n/a
Re: Where is the diversity antenna?

On Thu, 24 Nov 2005 00:45:40 -0500, "Thundaar"
<allied77@verizon.net> wrote:

>I have a Lincoln TownCar Signature (03) and the radio keeps cutting in and
>out randomly. The Cd works just fine all the time. The radio goes to pure
>static, then will work 95% static free for a day or so then static again.
>I think it may be the antenna connection, but I can't seem to find the
>diversity antenna to check it? I just had the center brake light replaced
>because of a bad bulb. Could it be there and it wasn't connected
>properly?
>HELP! where is it?



Many times, constant static is a result of a bad gorund in
the system somewhere. This is more common as the vehicle
ages and, especially, in the rust belt. I have had problem
in late model Ford products that simply could not be located
by ordinary methods. I have had good results installing a
filter in the power supply at the back of the radio. My
biggest proble has been noise associated with the wipers
such that the AM side was not useable with the wipers on.
Try turning different thing on and off when you are getting
the static. You may be able to associate it with a
particular curcuit.

Lugnut
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Old 11-24-2005, 12:01   #4 (permalink)
Shoe Salesman
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Posts: n/a
Re: Where is the diversity antenna?


"Thundaar" <allied77@verizon.net> wrote in message
news:e5cbd6c972307e1af417865aa052e84e@localhost.talkaboutautos.com...
>I have a Lincoln TownCar Signature (03) and the radio keeps cutting in and
> out randomly. The Cd works just fine all the time. The radio goes to pure
> static, then will work 95% static free for a day or so then static again.
> I think it may be the antenna connection, but I can't seem to find the
> diversity antenna to check it? I just had the center brake light replaced
> because of a bad bulb. Could it be there and it wasn't connected
> properly?
> HELP! where is it?

look in the trunk up under the rear deck, there it probably a plug for the
antenna there that is loose.


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