61 20 908 Performing battery "power reset" (for programming/coding control unit(s))
WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Observe 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 .
- Connect and switch on battery charger.
- Switch ignition on.