You likely need to be looking at the rear glass that incorporates the antenna. I have included a factory issued Technical Service Bulletin to help. Print it on first viewing in case it times out.
This article supersedes TSB 04-18-9 to update vehicle applications and service procedure.
Warrantable/Non Warrantable repairs
Warrantable grid line repairs typically can be identified by one inoperative grid line with a small discoloration at the area of concern, approximately the size of a pinhead. Grid line(s) that are scratched or have the silver material removed are not warrantable and should be addressed with the customer. Replacement of backglass for grid line or bus bar tarnishing is not a warrantable repair. Tarnishing of the silver lines or bus bars is a normal condition. Please refer to the Heated Back Lite Damageability Job Aid for additional information and examples of defects and damage.
Examples Of Non-Warrantable Grid Line Damage
GRIDLINES THAT HAVE BEEN "RAZOR BLADED" WILL FEEL SMOOTH WHEN A FINGERNAIL IS DRAGGED ACROSS THE AFFECTED AREA. THERE MAY BE SOME RESIDUE LEFT ON THE GLASS THAT APPEARS TO BE GRID MATERIAL BUT A CHECK WITH A VOLTMETER OR 12V TEST LAMP, AS EXPLAINED IN THIS ARTICLE, WILL CONFIRM AN OPEN CIRCUIT.
GRID LINE INOPERATIVE - DIAGNOSTICS
GRID LINE REPAIR PROCEDURE
Service inoperative grid lines on rear window glass using Motorcraft Defroster Repair PM-11 or equivalent meeting Ford specification ESB-M4J58-A as follows:
The bottle of Rear Window Defroster Repair compound and touch-up paint (if needed) must be at room temperature. Shake the bottle for at least one (1) minute for thorough mixing. Shake frequently during use.
The service coating will air-dry in approximately one (1) minute and the system can be energized after five minutes. Maximum hardness and adhesion occur after approximately 24 hours.
SOLDER METHOD OF LEAD TERMINAL
PLACE PROTECTIVE COVERING OVER THE PACKAGE TRAY AS NECESSARY.
The new terminal will cover the original terminal location, but must be placed so that the new terminal conductive areas will be placed on a good conductive base. This area should be cleaned with steel wool or an abrasive pad to remove grime from the buss-bar. The area should then be cleaned with Ultra Clear Spray Glass Cleaner, ZC-23, or equivalent meeting Ford specification ESR-M14P5-A to remove all dirt, wax, grease, oil or other foreign matter. It is important that the repair area be clean and dry and appear metallic. Depending on the buss-bar condition, rigorous polishing with steel wool may be required. Please note that the entire buss-bar may be cleaned to improve appearance.
BEFORE USING THE SOLDERING GUN, BE SURE TO MELT A SMALL AMOUNT OF ROSIN CORE SOLDER TO THE TIP. THE SOLDER WILL ASSIST IN ACHIEVING BETTER HEAT TRANSFER FROM THE SOLDERING GUN TIP TO THE NEW TERMINAL.
The new terminal has pre-applied solder, flux and temperature sensitive paint. The paint provides a visual indication when the terminal has reached the proper temperature to melt the solder on the terminal. When the proper temperature is achieved the temperature paint will liquefy and change color.
Use terminal type A (Figure 2) for all tab locations except on the Focus vehicle line. For the Focus, use type B (Figure 3).