See also:

Removing the key blade
Slide the spring loaded catch to the side. Pull the key blade straight out of the remote key. ...

Changing
WARNING Connect and disconnect the positive and negative cables in the correct sequence. Removal Switch off the ignition, remove the remote key from the ignition slot and wait at least 5 ...

External audio source volume
If an external devices such as an MP3 player or an iPod is connected to the AUX socket, the device's volume may be different from the volume of the internal sound sources such as the disc play ...