FYI...

I stopped by the Mercedes dealership this morning and ordered a key insert for the infrared remote I purchased on ebay – I paid less than $10.00 for the used infrared remote. I won’t be able to use the infrared features to control the locks, but I’ll use the remote case to hold the key insert. Since this is a “safety/alternate key” I’ll live without the infrared remote features for now and continue to use my primary remote. Buying the key insert sure beats paying $179.00 for a new replacement remote. The key insert cost me $27.00.

As I mentioned before, I was unable to get the mid-90’s infrared remote S-Class to sync with my 92 400se.

I thought I would post the below information incase anyone wants to read about the S-Class infrared remote functions. As you can see, don’t waste your money purchasing a used Infrared key.

Function
The infrared remote control can only be operated with the transmitter belonging to the vehicle since the transmitter and the control module installed in the vehicle are matched to one another.

The transmitter transmits the transmitter signal to the receiver as an infrared light beam. The receiver receives the light beam, filters out light from external sources, amplifies the transmitter signal and passes it on to the control module via a control line.

The transmitter signal consists of a fixed code which is additionally coded by a computer. This additional coding changes with each operation. It is thus not possible to decode the transmitter signal.

The control module decodes the transmitter signal and, if the fixed code is correct, operates the central locking, the convenience feature and the anti-theft alarm system. At the same time the control module adjusts to the next transmitter signal and blocks the previous transmitter signal.

If the transmitter is operated outside the reception range, the current transmitter signal changes in the transmitter but not in the control module. If the transmitter is used again in the reception range, the transmitter signal does not agree with that expected by the control module. However since the control module can calculate 250 further switchings, it adjusts to the current transmitter signal.
If the transmitter has been operated outside the reception range more than 250 times, the transmitter must be resynchronized. See: Keyless Entry Transmitter\Service and Repair
NOTE: When replacing the control module or the transmitter key, always quote the locking mechanism number, since these two components are tuned to each other.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML