GMC savana 2001 用户手册

Resynchronization may be necessary due to the security
method used by this system. The transmitter does not
send the same signal twice to the receiver. The receiver
will not respond to a signal it has been sent previously.
This prevents anyone from recording and playing back
the signal from the transmitter.

To resynchronize your transmitter, stand close to your
vehicle and simultaneously press and hold the LOCK
and UNLOCK buttons on the transmitter for at least 
five seconds. The door locks should cycle to confirm
resynchronization. If the locks do not cycle, see your
dealer for service.

To open the sliding side door from outside, pull the
handle toward the rear of the vehicle. Then, slide the
door open.