Acura 2010 TSX - Manual (Page 123)

The master key can be retracted into
the remote transmitter. To use the
key, push the release button to
release the key from the transmitter.
The key should be fully extended.
To retract the key, push the release
button and at the same time push the
key into the remote transmitter until
it is securely latched.
The key may come in contact with
your finger while being retracted or
extended. Make sure your fingers do
not touch the pivot of the key when
retracting or extending the key.
Always make sure the key is fully
extended when you insert it to the
ignition switch. If the key is not fully
extended, the immobilizer system
may not operate properly and
prevent the engine from starting. Retractable Master Key
Keys and Locks
120
Push
RELEASE BUTTON
2010 TSX