Mazda RX-8 Workshop Manual page 3355

2 Remove aftermarket electronic equipment.
Turn audio unit/car-navigation unit ON and
check reception condition.
Is reception improved?
3 Measure the voltage at battery.
Is the battery voltage okay?
Specification:
Ignition switch ON: 11.5 V or more
Idle: 12.5 V or more
NOTE:
4 Is noise occurring only when vehicle electrical
system (e.g. fuel pump) operates?
NOTE:
5 Inspect power supply, ground condition, and
noise prevention capacitor for electrical
component.
Is noise present after inspection?
NOTE:
Inspect that battery cables
are connected to terminals
securely.
Identify subject electrical
component by disconnecting
fuse, turning switch ON &
OFF, or disconnecting &
connecting connector.
It will be easy when
simulation function on M-
MDS is used.
Inspect following:
Power
supply to
electrical
component
YesThe system is normal.
(Explain to customers that
aftermarket electronic equipment is
cause of noise)
No Go to the next step.
YesGo to the next step.
No Charge battery.
Inspect charging system, and
repair or replace if necessary.
YesGo to the next step.
No Go to Step 6.
YesGo to the next step.
No Troubleshooting completed.
NOTE:
The SIRIUS
satellite radio is
supplied 12 V
battery power for
the AM radio
reception in the
radio mode. The