Pinpoint Test D: DTC B1602 - PATS Received Invalid Format Of Key-Code From Ignition Key Transponder: Notes
WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Refer to appropriate WIRING DIAGRAM ARTICLE, Passive Anti-Theft System for schematic and connector information.