Volvo XC90: Key, locks and alarm / Electronic immobilizer
The electronic immobilizer is a start inhibitor that helps prevent the vehicle
from being started by an unauthorized person.
The vehicle can only be started with the right remote key.
The following instrument panel error messages are related to the electronic immobilizer:

Remote immobilizer with tracking system
(Only certain markets and in combination with Volvo On Call.)
The vehicle is equipped with a system that makes it possible to track and locate
the vehicle and to remotely activate the immobilizer to prevent the vehicle from
being started. Contact your nearest Volvo retailer for more information and assistance
activating the system.
The following instrument panel error messages are related to the remote immobilizer
with tracking system:

The detachable key blade can be used to unlock the vehicle from the outside,
e.g. if the battery in the remote key is discharged.
Unlocking
Pull the front left-hand door handle
to its end position to access the lock cylinder...
The following information contains type designations for the start and lock
system.
Alarm system
USA FCC ID: MAYDA 5823(3)
This device complies with part 15 of the FCC rules...
Other information:
Limitations
Main channel vs. sub-channels (FM only): The main channel is the
only channel that can receive in hybrid mode (both digital and analog). If a
frequency has subchannels, they are broadcast in digital mode only. The main
FM channel will be displayed as, for example, "WRIF-FM HD1"...
The turn signal bulbs in the halogen headlights can be changed without the
help of a workshop.
Before the bulbs can be replaced, the plastic covering over the headlight must
be removed.
Before the lamp can be replaced, the rectangular headlight cover must be removed...