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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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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On Thu, 24 Nov 2005 00:45:40 -0500, "Thundaar"

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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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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