By disconnecting the battery earth wire (open circuit), safety is ensured when carrying out work on the electrical system.
The battery positive wire need only be disconnected for removal of the battery.
Theoretically, it is recommended to disconnect the battery during all electrical upgrades.
Switch off ignition and all electrical consumers.
A. Disconnecting in models with starter battery in engine compartment
The fuse holder, mounted on the battery, need not be removed to disconnect the battery.
- Loosen securing nut -1- and remove negative terminal clamp -2- from battery.
B. Disconnecting in models with starter battery in luggage compartment
Battery isolator improves crash safety on vehicles with battery installed in luggage compartment. In an accident, the airbag control unit triggers a charge that separates the supply line to the starter and the engine electronics. Battery isolation is performed pyrotechnically, with a very small explosive charge. To ensure that the charge is not triggered accidentally when working on the battery or the battery isolator, it is essential that the battery is first disconnected.
- Remove securing nut -1- and take out the temporary spare wheel.
- Remove securing bolts -arrows- and remove battery cover.
- Remove negative terminal cover -1-.
- Unscrew battery earth terminal clamp -A- from battery negative terminal.
Note:
After the battery has been connected and ignition is switched on, the ESP and TCS warning lamp -K155- will light up permanently. The warning lamp will go out automatically when the vehicle is driven at 15 to 20 km/h in a straight line. This has the effect of reactivating the steering angle sender -G85-.
Probably you will ned also open all electric windows fully and close again. Actuate then switch in closing direction and hold for 2 seconds (closing and opening actuation).
Electrical windows calibration is similar in most of VW cars:
