Mazda RX-8 Workshop Manual page 3317

Is there continuity?
8 Turn the ignition switch to LOCK
position
Disconnect the audio amplifier
connector (8-pin, 16-pin).
Inspect the continuity between the
audio amplifier connector and
ground:
Terminal 1G (8-
pin)—Terminal A
Terminal 1H (8-
pin)—Terminal B
For front
speaker
Terminal 2D (16-
pin, LH OUT+)—
GND
Terminal 2B (16-
pin, LH OUT-)—
GND
Terminal 2M (16-
pin, RH OUT+)—
GND
Terminal 2O (16-
pin, RH OUT-) —
GND
For front tweeter
Terminal 2I (16-
pin, LH OUT+)—
GND
Terminal 2K (16-
pin, LH OUT-)—
GND
Terminal 2E (16-
pin, RH OUT+)—
GND
Terminal 2G (16-
pin, RH OUT-)—
GND
For rear
speaker/tweeter
YesRepair or replace the related wiring harness
or speaker unit.
(See FRONT DOOR SPEAKER
REMOVAL/INSTALLATION.)
(See REAR SPEAKER
REMOVAL/INSTALLATION.)
(See CENTER SPEAKER
REMOVAL/INSTALLATION.)
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.