Volvo XC 90 Owner's Manual page 254

LOCKS AND ALARM
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NOTE
A Key Tag with a depleted battery should be
returned to an authorized Volvo retailer. The
key should also be erased from the vehicle's
electrical system because it could still be
used to start the vehicle from the back-up
start system.
Replacing the battery
Hold the remote key with the front side
(with the Volvo symbol) facing up and move
the button on the key ring section of the key
to the right. Slide the front cover slightly
upward.
The cover will loosen and can be
removed from the key.
252
Move the button to the side and slide
rear cover slightly upward.
The cover will loosen and can be
removed from the key.
Use e.g., a screwdriver to turn the battery
cover counterclockwise so that the markers
align toward OPEN.
Remove the cover carefully by pressing
e.g., a finger nail into the indentation.
Pry the cover up.