Mazda RX-8 Workshop Manual page 3314

Remove the audio unit.
Disconnect the audio unit connector
(24-pin).
Inspect the continuity between the
audio unit or car-navigation unit
wiring harness-side connector and
ground.
Is there continuity?
5 Inspect the continuity between the
following terminals of the audio
amplifier wiring harness-side
connector (24-pin) and the audio
unit wiring harness-side connector
(24-pin).
For front
speaker
Terminal 1A (LH+)
—GND
Terminal 1C (LH-)
—GND
Terminal 1D (RH+)
—GND
Terminal 1F (RH-)
—GND
For rear speaker
Terminal 1S (LH+)
—GND
Terminal 1U (LH-)
—GND
Terminal 1V (RH+)
—GND
Terminal 1X (RH-)
—GND
For front
speaker (audio
amplifier - audio
unit or car-
navigation unit)
Terminal A (LH+)—
Terminal 1D
No Go to Step 6.
YesGo to the next step.
No Repair or replace the related wiring
harnesses between the audio amplifier and
the audio unit or car-navigation unit.
Then go to the next step.