still could be a power related issue. make sure voltages are correct at each antenna location and that there is no interference.
NOTE: The IA feature is a programmable parameter and can be enabled/disabled with a scan tool. If the feature is disabled, the IA feature to enter the vehicle and passive starting are inoperative. To start the vehicle, the IA key must be placed in the backup transceiver slot.
The RFA module and the BCM control the ignition modes and, in conjunction with the PCM, control the starting system
Backup Starting
NOTE: There are certain areas within the vehicle where the IA key may not be detected and the message center displays NO KEY DETECTED. If the IA key is in the far outside edges of the interior (such as in a door map pocket or above a sun visor), it may not be detected. Move the IA key to a different location and try to start the vehicle again.
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. If this occurs, the NO KEY DETECTED message displays in the message center when the start/stop switch is pressed.
However, in the event of one of these failures, the IA key can be placed in the backup transceiver slot to allow the vehicle to start. The IA key should be placed in the backup transceiver slot with the buttons facing outwards and the key ring up. If a programmed IA key is in the backup transceiver slot when the backup transceiver activates, the IA key and the identification code is sent to the RFA module. The backup slot is located in floor console storage compartment.
No Key Detected Message
NOTE: Some brands/types of mobile phone or laptop computer chargers may cause interference that could lead to a PATS no-start if the IA key is within close proximity of the charger. If a concern is observed, move the IA key away from the charger and attempt to start the vehicle.
There are 2 scenarios in which the No Key Detected message displays in the message center.
The first is when the ignition is off, the START/STOP button is pressed and a programmed Intelligent Access (IA) key is not detected inside the vehicle. If a component failure (such as a dead Intelligent Access (IA) key battery) is causing the No Key Detected message to display, the backup starting method can be used.
The second scenario is when the vehicle is running, the driver exits the vehicle with the programmed Intelligent Access (IA) key and closes the door.
The RFA module activates all 3 passive start antennas to search the inside of the vehicle for an Intelligent Access (IA) key any time a door or the luggage compartment lid is opened and then closed with the vehicle running. The Key outside car message displays in the message center and the horn chirps twice when the ignition is on and an Intelligent Access (IA) key is no longer detected inside the vehicle.
This strategy deters the Intelligent Access (IA) key from being separated from an already running vehicle. If the Intelligent Access (IA) key is no longer in the vehicle, the ignition remains on and the vehicle continues to operate. When the START/STOP button is pressed to turn the ignition off, the ignition can be restarted without an Intelligent Access (IA) key present inside the vehicle for approximately 10 seconds. After 10 seconds have elapsed, a programmed Intelligent Access (IA) key must be present to transition the ignition out of off. If the driver door is opened during the 10-second countdown, a programmed Intelligent Access (IA) key is needed to transition the ignition out of off.