If a radio system is installed improperly or if a high-powered type is used, the CIS and other systems may be affected. When the vehicle is to be equipped with a radio, observe the following precautions:
Mazda 6 Service Manual: Temporary Spare Tire
Inspect the temporary spare tire at least monthly to make sure it is properly
inflated and stored.
NOTE
The temporary spare tire condition gradually deteriorates even if it has not
been used.
The temporary spare tire is easier to handle because of its construction which
is lighter and small ...
Mazda 6 Service Manual: Door lock timer unit inspection
1. Measure the voltage at the door lock timer unit terminals (other than
terminal 1E and 2W) as indicated below.
If not as specified, inspect the parts listed under Action.
2. Disconnect the negative battery cable.
3. Disconnect the door lock timer unit connector and inspect for continuity ...