The ventilation opening of the 12-volt vehicle battery must always be on the negative terminal side: the ventilation opening on the
positive terminal side must always be sealed →
.
Only maintenance-free 12-volt vehicle batteries compliant with the standards TL 825 06 and VW 7 50 73 should be used. These
standards must be dated October 2014 or later.
The 12-volt vehicle battery must always be replaced by a workshop qualified to do this, as the vehicle electronics must be adapted as
part of the replacement process. Only suitably qualified workshops have the technology required to carry out this adjustment and also
the correct replacement batteries.
Disconnecting the 12-volt vehicle battery
Please note the following if the 12-volt vehicle battery has to be disconnected from the electrical system in the vehicle:
1. Switch all electrical consumers off.
2. Unlock the vehicle before disconnecting the battery in order to avoid triggering the anti-theft alarm.
3. First disconnect the negative cable and then the positive cable →
.
Connecting the 12-volt vehicle battery
Please observe the following if the 12-volt vehicle battery has to be connected to the electrical system in the vehicle:
1. Switch all electrical consumers off.
2. First reconnect the positive cable and then the negative cable →
.
Various indicator lamps may light up after the 12-volt vehicle battery has been connected and the ignition is switched on. They will go
out if you drive a short distance at a speed of around 15 km/h to 20 km/h (around 10 mph to 12 mph). If the indicator lamps stay lit,
the vehicle should be checked by a suitably qualified workshop. Volkswagen recommends using an authorised Volkswagen repairer.
If the 12-volt vehicle battery was disconnected for an extended period, the system may not able to calculate or correctly display the
time when the next service is due (→ Service interval display). Observe the maximum permissible service intervals .
Vehicles with starter button: Perform the following actions if the ignition cannot be switched on after connecting the 12-volt vehicle
battery:
1. Lock and unlock the vehicle from the outside.
2. Try to switch on the ignition again.
3. Please seek expert assistance if the ignition cannot be switched on.
Automatic switch-off for electrical consumers
If the ignition is switched on for an extended period when the engine is switched off or the exterior lighting is switched on for a long
time when the vehicle is parked, the intelligent onboard supply management system cannot always prevent discharge of the 12-volt
vehicle battery.
If the 12-volt vehicle battery is subject to high loads, the intelligent onboard supply management system automatically performs
various measures to prevent discharge of the 12-volt vehicle battery.
—The idling speed is increased so that the alternator provides more electricity.
—The performance of large electrical consumers may be reduced or they may be switched off completely.
—The power supply to the 12-volt socket may be interrupted briefly while the engine is being started.
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