Mazda RX-8 Workshop Manual page 2244

2. Remove the battery cover.
3. Disconnect the negative battery cable.
4. Remove the front tunnel member.
5. Remove the rear tunnel member.
6. Remove the catalytic converter. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [13B-
MSP].)
7. Remove the insulator.
8. Disconnect the TR switch connector.
9. Verify continuity as indicated in the table.