Opel ASTRA Owner's Manual page 25

Note
Do not put the electronic key in the
load compartment or in front of the
Info-Display.
Replacing battery in electronic
key
Replace the battery as soon as the
system no longer operates properly
or the range is reduced. The need for
battery replacement is indicated by a
message in the Driver Information
Centre 3 105.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
To replace:
1. Press button at the back of the
electronic key unit and extract the
key blade from the housing.
Keys, doors and windows
2. Insert flat screwdriver or the key
blade at the side of the housing
and separate the back cover from
the electronic unit by turning the
screwdriver or key blade.
3. Remove and replace battery. Use
CR 2032 or equivalent battery.
Pay attention to the installation
position.
4. Install back cover of the electronic
unit and insert key element.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Electronic key synchronisation
The electronic key synchronises itself
automatically during every starting
procedure.
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