12 00 ... Instructions for disconnecting and connecting battery

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

Observe safety instructions for handling vehicle battery. Refer to 61 00 ... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .

Before Disconnecting Battery:

Switch off ignition.

NOTE: If the ignition is not turned off when the battery is disconnected, fault memories may be set in some control units.

Important!

There is a danger of mixing up battery leads: If the battery positive and negative leads are the same color and you are in doubt, follow the polarity to the battery, then mark and cover the leads.
On vehicles with radio code: After disconnecting the battery, the radio code must be re-entered. Therefore obtain the radio code card from the customer beforehand. Note stored stations and restore them after connecting the battery.
Stored settings of the on-board computer and clock will also be lost.
All available central keys must be receded for cars with first generation infrared transmitter locking systems.

General Notes On Disconnecting Battery:

Do not disconnect battery leads and leads from alternator and starter motor while engine is running.
Cars with IBS on battery negative terminal:
Do not under any circumstances pull/lever off pole shoes by force.
Do not under any circumstances release socket-head cap screw of IBS.
When work is carried out on the electrical system, faults may be caused in the fault memories of some control units when the battery is connected.

After Connecting Battery:

Important!

After a power supply interruption some equipment is disabled and must be reactivated.

For further information and instructions on vehicle-specific activation, please refer to PROCEDURE FOR INITIALIZATION .