Backup Starting
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle can experience a PATS no start if there is a failure of any passive start antenna, the battery in the IA key, or the TPM module. However, in the event of one of these failures, the IA key can be placed in the backup slot to allow the vehicle to start. If a programmed IA key is in the backup slot when the backup transceiver is activated, it activates the IA key and the identification code is sent back to the RFA module.