61 20 908 Performing Battery "Power Reset" (For Programming/Coding Control Unit(S))

WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Observe safety instructions for handling vehicle battery . See 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

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

Switch off and disconnect battery charger
Switch off ignition
Cars with ignition key: Turn ignition key to 0 position

Cars with identification sensor: Remove identification sensor from slot

Cars 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.
Tightening torque. See GENERAL ELECTRICAL SYSTEM - TIGHTENING TORQUES .
Connect and switch on battery charger
Switch ignition on