Battery A, Disconnecting And Connecting, Vehicles With 48V System, (VH2/VH3)

WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. 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.

Conditions

For subsequent work on the SCR system, wait until all of the reducing agent has returned after switching off the ignition.

Disconnecting

-- Refer to 48V SYSTEM, DE-ENERGIZING .

-- Open the cover in the right luggage compartment side trim panel.

-- Remove the nut -1-.

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-- Free up the ground cable -2- at the threaded pin.

CAUTION:

Risk of short circuit by the battery terminal clamps.

- Insulate the battery terminal clamps.

-- Immediately wrap the ground wire with insulating tape -arrow- and set it aside.

Connecting

-- Disconnect the connector -2-.

Fig 1: Connecting Battery

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-- Connect the control module -3- to the battery negative terminal "-".

-- Tighten the nut -1-.

-- Connect the connector -2-.

-- Refer to 48V SYSTEM, RE-ENERGIZING .

If the battery was reconnected, the following steps must be performed:

Activate the one-touch up/down function for the power window regulators. Refer to the Owner's Manual.
Check DTC memories of all control modules and delete the displayed entry "Undervoltage" using the Vehicle Diagnostic Tester .

Tip

After reconnecting the power supply, the ESP warning lamp can only go out after the vehicle has been driven a few meters.

Tightening Specifications

Refer to OVERVIEW - BATTERY A, VEHICLES WITH ALTERNATIVE DRIVE SYSTEM, (0K4) .