Battery -A-, DISCONNECT AND CONNECT, 0K4: Notes
WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
The 12 V system is supported by the 48 V system via the Voltage Converter, 48 V/12 V -A7-. So the only way for the 12V vehicle electrical system to be de-energized is to de-energize the 48V system beforehand.
Disconnecting
-- De-energize the 48V system. Refer to 48V SYSTEM, DE-ENERGIZING .
-- Switch off the ignition and all electrical equipment. Place the ignition key outside of the vehicle.
-- Remove the cover -1- over the battery negative terminal.
-- Loosen the nut -3- several turns and remove the battery ground cable terminal clamp -2- from the battery terminal.