Volkswagen Golf GTI 2016, Owner'S Manual

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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 → Remote
control vehicle keys .
Remove the cap from the outside door handle on the driver door
→ Emergency closing and opening .
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 on the driver door handle.