Cadillac 2006 XLR Owner's Manual page 182

NO FOB DETECTED: This message is displayed if the
vehicle does not detect the presence of a keyless
access transmitter when you have attempted to start the
vehicle or a vehicle door has just closed. The following
conditions may cause this message to appear:
•
Driver-added equipment plugged into the accessory
power outlet on the center console is causing
interference. Examples of these devices are cell
phones and cell phone chargers, two-way radios,
power inverters, or similar items. Try moving
the keyless access transmitter away from these
devices when starting the vehicle. In addition,
PDA devices and remote garage and gate openers
may also generate Electromagnetic Interference
(EMI) that may interfere with the keyless access
transmitter. Do not carry the keyless access
transmitter in the same pocket or bag as these
devices.
3-72
•
The vehicle is experiencing Electromagnetic
Interference (EMI). Some locations, such as
airports, automatic toll booths, and some gas
stations, have EMI fields which may interfere with
your keyless access transmitter.
If moving the transmitter to different locations within
the vehicle does not help, place the transmitter
in the glove box transmitter pocket with the buttons
facing to the right and then press the START button.