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Unfortunately, I don't have the wiring diagrams for your car... but, the IR/DAS system doesn't have that many components (although they are complex) so, not sure a wiring diagram will help.
Seems to me (may be wrong) that if the IR remote is unlocking all the doors properly, and the alarm is not going off when you open the door, that the system knows the car is unlocked... so, the numerous door switches are probably OK.
When you attempt to start the car, the Engine Control Module generates a random number which is sent to the IRCL module. The ECM uses this random number combined with a code number to calculate an authorization number. At the same time, the IRCL makes the same calculation with the same numbers. The IRCL sends the authorization number to the ECM where a comparision is made. If they match (meaning the codes match) the start is "authorized" and the fuel injection management function is enabled. The ECM then communicates back to the IRCL that the start was authorized. IF the start is not authorized, the fuel injection system is not enabled, the IRCL gets a "no start" signal, and the red/green lights flash alternately.
I think this is where your system is failing... so, I'd carefully check the engine control module and the IRCL connections.
On the MY96 E class, the IRCL is supposed to be under the floor panel on the passenger side. I've attached a pix.
I don't have an E, so this is all strictly from the literature that is available to me... but, its worth a try.
IF the IRCL is failing internally due to cold temps, you could test for this by leaving the IRCL exposed until it fails and then warm it with a hair dryer... if it then starts after warming, you've found your culprit.
Hope this helps.
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KenP
1996 S500 W140 Coupe
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