Mazda RX-8 Workshop Manual page 3310

Is there any speaker with no
sound?
2 Turn the ignition switch to the
LOCK position.
Disconnect the audio unit
connector (24-pin).
Inspect the continuity
between the audio unit wiring
harness-side connector (24-
pin) terminal and ground.
Is there the continuity?
3 Turn the ignition switch to the
LOCK position.
Remove the audio unit.
Disconnect the audio unit
connector (24-pin).
Inspect the continuity
between the audio unit wiring
harness-side connector
terminal and ground:
changes in
the order of
left— front
speaker, right
— front
speaker, right
— rear
speaker and
left — rear
speaker.
For front
speaker
Terminal 1A
(LH+)—GND
Terminal 1C
(LH-)—GND
Terminal 1D
(RH+)—GND
Terminal 1F
(RH-)—GND
YesRepair or replace the suspect wiring harness or
speaker unit.
NOTE:
If there is a short circuit between
the speaker harness or speaker
lead wire and ground, the
protector circuit inside the audio
unit operates to cut the sound.
No Go to the next step.
YesRepair or replace the suspect wiring harness or
speaker unit.
No Go to the next Step.
NOTE:
If there is a short circuit between
the speaker harness or speaker
lead wire and ground, the
protector circuit inside the audio
unit or car-navigation unit
operates to cut the sound.