Mazda RX-8 Workshop Manual page 2909

Seat Weight Sensor Handling
The seat weight sensor has a built-in strain gauge which may operate
improperly if the sensor is dropped by itself or when installed to the seat. If it
is dropped, replace the seat weight sensor with a new one.
Oil, grease, or water on the seat weight sensor may cause the system to
operate (deploy) improperly. Never allow oil, grease, or water to get on the
seat weight sensor.
Foreign material in the seat weight sensor components may cause the system
to operate (deploy) improperly. Always make sure that no foreign material can
get into the seat weight sensor.
Disassembling the seat weight sensor, or tightening any of the nuts and bolts
installed to the sensor body may cause it to operate (deploy) improperly. Never
disassemble the seat weight sensor or tighten any of the nuts or bolts installed
to the body of the sensor.
Air Bag Module, Pre-tensioner Seat Belt Reuse
Even if an air bag module or a pre-tensioner seat belt does not operate (deploy)
in a collision and does not have any external signs of damage, it may have been
damaged internally, which may cause improper operation. Before reusing a live
(undeployed) air bag module and the pre-tensioner seat belts, always use the
on-board diagnostic to diagnose the air bag module and the pre-tensioner seat
belts to verify that they have no malfunction.
Air Bag Wiring Harness Repair
Incorrectly repairing an air bag wiring harness can accidentally operate
(deploy) the air bag module and pre-tensioner seat belts. If a problem is found
in the air bag wiring harness, always replace the wiring harness with a new
one.