Mazda 2005 mx-5 miata Manual page 172

Interior Comfort
Audio System
2. Press the auto memory button
( ) and the channel preset button
6 simultaneously for about 2 seconds
until CODE is displayed.
3. Again press the auto memory button
( ) and the channel preset button
6 simultaneously while CODE is
displayed (within 10 seconds). The
display will exhibit bars.
4. While the bars are displayed, input the
current code number as described in
setting procedure Step 4. (2547, for
example).
6-46
5. While the code number is displayed,
press the auto memory button
( ) and the channel preset button
6 simultaneously for about 2 seconds
and CODE appears.
6. After 5 seconds, CODE will
disappear. This indicates the code
number is canceled.
NOTE
If Err (error) appears on the display,
begin from Step 4.
Changing code number
To change the code number, first cancel
the number. Then set the new number by
following the setting procedures.
System activation
When the power supply is disconnected or
interrupted, the antitheft system is
activated and the unit is rendered
inoperative. In this condition, when power
is again supplied, CODE will be
displayed and flash unless the correct
code number is input.