61 20 908 Performing Battery "Power Reset" (For Programming/Coding Control Unit(S))
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 BMW 750i, 2008 BMW 750Li, 2007 BMW 750i, 2007 BMW 750Li, and 2006 BMW 750i. 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 61 21 1AZ . See GENERAL ELECTRICAL SYSTEM - TIGHTENING TORQUES .
- Connect and switch on battery charger
- Switch ignition on