61 20 908 Carrying out battery "power reset"

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Observe SAFETY INFORMATIONS FOR HANDLING VEHICLE BATTERY .

The following steps must be carried out for a "power reset":

Switch off and disconnect battery charger
Switch off ignition
Vehicles with ID transmitter: Remove ID transmitter from slot

Vehicles with comfort access system: Make sure terminal is in 0 position
Disconnect battery negative terminal
Reconnect battery negative terminal (to ensure bus activity)

Waiting time (5-10 seconds)
Disconnect battery negative terminal
Waiting time (1 minute)
Connect battery negative terminal and tighten, tightening torque 61 21 1AZ
Connect and switch on battery charger
Switch on the ignition.