Battery -A-, DISCONNECTING AND CONNECTING, 0K4 AND VH2: Connecting

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Connecting Battery

Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connector -2- from the Battery Monitoring Control Module -J367- -3-.

-- Attach the battery ground cable clamp by hand to the battery negative terminal "-" and tighten the nut -1-.

-- Reconnect the connector to the Battery Monitoring Control Module -J367-.

-- Re-energize the 48V system. Refer to 48V SYSTEM, RE-ENERGIZING .

When the battery is reconnected, the following steps must be performed:

Activate the power window regulator one-touch up/down function. 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- AND Battery, 48 V -A6-, IN LUGGAGE COMPARTMENT (0K4 + VH2)