Volkswagen PASSAT 2013 Manual page 57

Make sure the plus and minus poles of the battery are correctly positioned.
Dispose of old batteries in an environmentally responsible manner and keep them out of the
reach of children.
Batteries of the type used in your remote control vehicle key may contain Perchlorate Material.
Special handling may apply – see http://www.dtsc.ca.gov/hazardouswaste/perchlorate. Obey all legal
requirements regarding handling and disposal of these batteries. Authorized Volkswagen dealers and
authorized Volkswagen Service Facilities are familiar with the requirements, and we recommend that
you have them perform this service for you.
Synchronizing the remote control vehicle key
Please first read and note the introductory information and heed the WARNINGS
If the button is pressed often while outside the operating range, it is possible that the vehicle cannot
be locked or unlocked anymore with the remote control vehicle key. Synchronize the vehicle key as
follows:
Unfold the key bit on the remote control vehicle key.
Remove the cap from the door handle on the driver door.
Press the button on the remote control vehicle key. Stand immediately next to vehicle while doing
so.
Manually unlock the vehicle using the key bit within 1 minute. The synchronization is complete.
Reinstall the cap.
.