Mercedes-Benz A-Class 2021 Operator's Manual page 149

synchronization of the rolling code with
the door system must also be carried out.
If indicator lamp 4 does not light up or flash
#
green: repeat the procedure.
Release all of the buttons.
#
% The remote control for the door drive is not
included in the scope of delivery of the
garage door opener.
Synchronizing the rolling code
Requirements:
The door system uses a rolling code.
R
The vehicle must be within range of the
R
garage door or door drive.
The vehicle as well as persons and objects
R
are located outside the range of movement
of the door.
Press the programming button on the door
#
drive unit.
Initiate the next step within approximately
30 seconds.
Press previously programmed button 1,
#
or 3 repeatedly until the door closes.
When the door closes, programming is com‐
pleted.
% Please also read the operating instructions
for the door drive.
Troubleshooting when programming the
remote control
Check if the transmitter frequency of remote
#
control 5 is supported.
Replace the batteries in remote control 5.
#
Hold remote control 5 at various angles
#
from a distance of 0.4 in (1 cm) to 3 in
(8 cm) front of the inside rearview mirror.
You should test every position for at least
25 seconds before trying another position.
Hold remote control 5 at the same angles
#
at various distances in front of the inside rear
view mirror. You should test every position
for at least 25 seconds before trying another
position.
Driving and parking 147
2 On remote controls that transmit only for a
#
limited period, press button
control 5 again before transmission ends.
Align the antenna line of the door opener unit
#
with the remote control.
% Support and additional information on pro‐
gramming:
On the toll free HomeLink
R
1-800-355-3515
On the Internet at https://
R
www.homelink.com/mercedes
Opening or closing the garage door
Requirements:
The corresponding button is programmed to
R
operate the door.
Press and hold buttons 1,
#
the door opens or closes.
If indicator lamp 4 flashes yellow after
#
approximately 20 seconds: press and hold
the previously pressed button again until the
door opens or closes.
6 on remote
®
Hotline on
2 or 3 until