Disconnecting and Connecting Battery

Instructions for disconnecting and connecting battery

Observe safety instructions for handling vehicle battery. 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.

CAUTION! Danger of mixing up: 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 down programmed stations and store these stations back in memory once battery has been reconnected.

Stored settings of the on board computer and clock will be lost.

All available keys must be recorded for cars with first generation infrared transmitter locking systems.

General notes on disconnecting battery:

The battery and the leads to the alternator and starter motor must not be disconnected while the engine is running.
Detach terminal of battery negative lead from car battery and second battery if fitted. Cover bettery negative terminal.
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 up battery:

CAUTION!

Required in various models.

E36 only: initialize power windows

Initialize sunroof