Volvo 2009 XC90 Owner's Manual page 216

09 Maintenance and servicing
Battery
09
1. Switch off the ignition.
2. Wait at least 5 minutes after switching
off the ignition before disconnecting the
battery so that all information in the vehi-
cle's electrical system can be stored in the
control modules.
3. Remove the retaining bracket and unscrew
the cover over the battery. Wait at least
5 minutes after switching off the ignition
before disconnecting the battery so that all
information in the vehicle's electrical sys-
tem can be stored in the control modules.
4. Disconnect the negative (ground) cable
first.
216
5. Disconnect the positive cable and pull the
ventilation hose from the battery.
6. Lift out the old battery and put a new bat-
tery into place.
7. Connect the positive cable first.
8. Connect the negative (ground) cable.
9. Be sure that the ventilation hose (see right
column) is securely connected to the bat-
tery and that the other end of the hose is
properly routed through the ventilation
opening in the floor of the battery compart-
ment.
Ventilation hose
10. Reinstall the cover and retaining bracket
and screw it securely in place.
NOTE
After the battery has been disconnected or
replaced, lock and unlock the vehicle with
the central locking system's remote control
to reactivate such features as the power
windows, moonroof, courtesy lighting, etc.
WARNING
•
The battery generates hydrogen gas,
which is flammable and explosive. The
battery is fitted with a ventilation hose
which vents hydrogen gas out of the
battery compartment through a ventila-
tion opening in the bottom of this com-
partment. If the battery must be
replaced, it is essential that the ventila-
tion hose is properly connected to the
battery and that it is routed through the
ventilation opening provided (see illus-
tration).
•
Be sure the ventilation hose is free of
debris.
•
Only use replacement batteries equip-
ped with a ventilation hose. Consult a
trained and qualified Volvo service tech-
nician.