Keyless alarm or keyless door locks? If locks, have done in both an 86 W201 and a 87 W124. Both needed the above mentioned relays (see the links) and both needed a disarm wire to the factory alarm. The damn things would arm the factory alarm, but would not disarm upon unlocking without the pulse to the factory alarm module. I guess its also a keyless alarm using the factory system.

Also, there is an "Aussie" Keyless Entry for sale on some of the boards that is a basic commercial unit with the relays already wired up and connectors installed, said to be plug and play. Its rather pricy but weigh your time and learning curve.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon