I also am having trouble seperating the housing from the electronics in my 2nd infrared key (95S420). Key does not look exactly the same as above, but close. I don't have a location for the keychain attachment on either key. Currently freshly installed batteries last two days before depleted, but the remote works. Both batteries are dead when removed. I suspect just dirt shorting out the batteries internally, but without having the plastic off, I can't confirm.

How did you seperate the halves. I've pried, pulled and cursed to no avail. Anybody dissassembled the older infrared keys please chirp in.

Thanks

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1995 E320 -171k-km
1995 S420 -333k-km