Mine would not re synch using the manual's instructions; the dealer said to use a different procedure and it worked. I am sorry I do not remember it for sure, but it seems they told me to simply put the key in the driver door lock and hold the button down while turning it twice in the same direction (forgot which). If this doesn't work, you may get a better answer at 1-800-FOR-MERC.
RIP "Betsy" (Oo=*=oO)
'96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled)
Spaces in sig so as not to screw up the SEARCH; every time someone searches for that MB they don't want my sig!
2004 Audi A8L
'98 VW Passat 1.8T 5M
'87 Alfa Romeo Milano 2.5L 5M
'67 Impala convertible, 327cid