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Garage door opener, function - GF68.05-P-0001CE

MODEL 204.0 /2 with CODE (232) Garage door opener with frequency 284-390 MHz as of model year 2009 /YoM 08 

MODEL 204.3 with CODE (232) Garage door opener with frequency 284-390 MHz 

MODEL 204.9 with CODE (232) Garage door opener with frequency 284-390 MHz 

Fig 1: Identifying Garage Door Opener Function Diagram
G07528019Courtesy of MERCEDES-BENZ USA

Function requirements, general 

Garage door opener, general 

The garage door opener transmitter unit is a remote control capable of learning with which various receivers of the opening and locking systems for doors or gates can be activated.

The garage door opener is integrated into the inside rearview mirror.

The signals from the garage door opener are read in by the front SAM control unit with fuse and relay module via the wiper/inside rearview mirror LIN.

The garage door opener indicator lamp provides user guidance.

The garage door opener radio signal has a range of approx. 85 % of the original hand transmitter.

The following frequencies are available: - 284...390 MHz

IMPORTANT On vehicles up to 28.2.11, user guidance (two-hand operation) consists of a single-color indicator lamp in the garage door opener (red). On vehicles as of 1.3.11 user guidance (single-hand operation) consists of a multi-colored indicator lamp in the garage door opener (green, yellow and red).

The garage door opener system comprises the following partial functions:

Function sequence, transmit radio signal 

When one of the following buttons is pressed, a radio signal assigned to this memory is transmitted:

The indicator lamp in the garage door opener serves for function feedback (red up to 28.2.11, green as of 1.3.11).

Function sequence, programming the memories 

Vehicles up to 28.2.11:

Hold down desired button for at least t = 20 s. As a result the system changes into learning mode which is displayed by the flashing of the garage door opener (red) with f = 1 Hz. Continue to press selected button and hold original hand transmitter close to the garage opener transmitter unit with transmitter function activated for up to t = 90 s (s = 3 to 20 cm). The transmission frequency of the hand transmitter is now taught in.

In the process the garage door opener transmitter unit searches for the suitable frequency among the possible transmission frequencies.

If the learning process is completed, this is confirmed by the garage door opener indicator lamp flashing rapidly red at a frequency of f = 5.6 Hz.

Vehicles as of 1.3.11:

Hold down desired button for at least t = 10 s. As a result the system changes into learning mode which is displayed by the flashing of the garage door opener (yellow) with f = 1 Hz. Then press original hand transmitter close to the garage opener transmitter unit with transmitter function activated for up to t = 90 s (s = 3 to 20 cm). The transmission frequency of the hand transmitter is now taught in. In the process the garage door opener transmitter unit searches for the suitable frequency among the possible transmission frequencies.

Successful termination of the teach-in procedure is indicated by the garage door opener indicator lamp illuminating green (fixed code learned in) or flashing green (variable code with f = 5.6 Hz learned in).

An unsuccessful learn-in attempt is indicated by the garage door opener indicator lamp illuminating red.

IMPORTANT The compatibility of the garage door opener is approx. 85% with those garage door opening systems offered in the main commercial outlets. If the original hand transmitter is not compatible with the garage door opener, a universal receiver ("Fix Kit Receiver") which reacts to the in-plant programming of the garage door opener can be installed in the garage.

Function sequence, erase the memories 

Vehicles up to 28.2.11:

To erase the memories, press the two outer buttons (buttons 1 and 3) simultaneously for a period of a least t = 20 s. The garage door opener indicator lamp flashes in red for a period of t = 10 s. Release buttons during flashing phase. The existing data of the memory locations is erased.

Vehicles as of 1.3.11:

To erase the memories, press the two outer buttons (buttons 1 and 3) simultaneously for a period of a least t = 10 s. The garage door opener indicator lamp flashes green for a period of t = 10 s. Release buttons during flashing phase. The existing data of the memory locations is erased.

IMPORTANT The garage door opener goes to the learn-in mode when one of the three buttons is pressed again.

If no programming is performed in learning mode during a period of t = 100 s, the garage door opener switches off automatically to protect the on-board electrical system.

Function sequence for resetting to delivery status 

To reset, press the outer two buttons (button 1 and 3) simultaneously for at least t = 30 s.

Basic setting:

- "Chamberlain" - algorithm (f = 310 MHz)

Function sequence for protection against misuse 

With each communication the front SAM control unit transmits a security code to the garage door opener via wiper/inside rearview mirror LIN. If the code transmitted does not coincide with the stored code, the channels learned in are erased. However, the national coding is maintained.

Overview of system components for electric mirror GF88.79-P-9996CE