Volvo S90 Owner's Manual page 244

KEY, LOCKS AND ALARM
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The battery in the button-less key
cannot be replaced - a new key can be
ordered from an authorised Volvo workshop.
IMPORTANT
A discharged Key Tag must be handed
over to an authorised Volvo workshop. The
key must be deleted from the car since it is
still possible to use it to start the car via
back-up start.
6 Supplied with cars equipped with keyless locking/unlocking*.
242
Opening the key and changing the
6 (Key Tag)
battery
Hold the remote control key with the
front visible and the Volvo logo facing the
right way - slide the button at bottom
edge by the key ring to the right. Slide the
front side's shell a few millimetres
upwards.
The shell will then come free and can
be lifted off the key.
Turn the key, move the button to the
side and slide the back shell a few milli-
metres upwards.
The shell will then come free and can
be lifted off the key.
* Option/accessory.