Mazda RX-8 Manual page 1968

If the continuity is as indicated in the table, replace the front tweeter.
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2. Connect a 1.5 V battery to the front tweeter and verify that noise is sound from the front tweeter.
If no sound is output, replace the front tweeter.
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BOSE
1. Verify that sound is output from the front door speaker.
If sound is output, go to the next step.
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If no sound is not output, inspect the front door speaker and the related wiring harnesses.
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2. Remove the following parts:
a. Remove the rear seat.(See REAR SEAT REMOVAL/INSTALLATION .)
b. Remove the console.(See CONSOLE REMOVAL/INSTALLATION .)
c. Remove the tire house trim.(See TIRE HOUSE TRIM REMOVAL/INSTALLATION .)
d. Remove the rear pillar trim.(See REAR PILLAR TRIM REMOVAL/INSTALLATION .)
e. Remove the rear package center trim and the rear package side trim.(See REAR PACKAGE
TRIM REMOVAL/INSTALLATION .)
f. Remove the main amplifier.(See AUDIO AMPLIFIER REMOVAL/INSTALLATION .)
3. Verify that the continuity between the front tweeter and the main amplifier is as indicated in the table.
If the continuity is not as indicated in the table, repair or replace the related wiring harnesses.
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If the continuity is as indicated in the table, replace the front tweeter.
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(w) RX-8 Body
Page 250