911 Carrera 4 Cabriolet AWD F6-3600cc 3.6L SOHC (1990)
Air Bag(s) Arming and Disarming: Service and Repair
1.
Turn ignition switch to Off position.
2.
Disconnect and cover battery ground cable, then cover negative battery terminal.
3.
Wait 20 minutes before starting any necessary repairs. This is necessary to interrupt the power supply to the airbag system.