Vehicles have various electrical parts. To protect the parts from excessive current generated when welding, be sure to perform the following procedure.
1. Turn the ignition switch to the LOCK position.
2. Disconnect the battery cables.

3. Securely connect the welding machine to the ground near the welding area.
4. Cover the peripheral parts of the welding area to protect them from weld spatter.

Electrical troubleshooting tools
Jacking positions ,vehicle lift (2 supports),safety stands (rigid rack)
positionsMazda 6 Service Manual: Air bag module and pre-tensioner seat belt disposal procedures
Warning
Before scrapping a vehicle with a live (undeployed) air bag module
and pre-tensioner seat belt, deploy the air bag module and pre-tensioner
seat belt. Never dispose of a live (undeployed) air bag module and pre-tensioner
seat belt.
The air bag module and the pre-tensioner seat ...
Mazda 6 Service Manual: Battery recharging
Warning
Keep any flammable away from the battery, otherwise evaporated gas
of the battery fluid may catch fire, and cause serious injury or death.
Caution
When removing the battery, disconnect the negative battery cable
first and install it last to prevent damage to electrical compo ...