Battery -A-, DISCONNECTING AND CONNECTING, 0K4 AND VH2: Notes
WARNING: This page is about a different car, the 2024 Audi A4 allroad. 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.
- For subsequent work on the SCR system, wait until all of the reducing agent has returned after switching off the ignition.
Disconnecting
-- De-energize the 48V system. Refer to 48V SYSTEM, DE-ENERGIZING .
-- Switch the ignition off.
-- Lift the luggage compartment floor cover.
-- If equipped, remove the spare tire and vehicle tool kit mount.
-- Open the cover -3- over the battery negative terminal.
-- Loosen the nut -1- several turns and remove the battery ground cable clamp -2- from the battery terminal.