ingine start on a '97 e320

i need help trying to by pass the imobilizeron this mercedes. i installed a bypass from dei, 555u....but it did not work.    i took the ignition part and tried putting the ring fron the bypass right nert to the antena ring in the car and it didn't work either. however, when i put the actual transponder in the same location the remote start works perfectly.... this car has a single wre antena system, so i can't use the alternate installation for this same kit...... the e320 was made february, 1997......does any body know what i may be doing wrong or has any body done this car with another bypass?, if so which one is it and where may i get it....... thanks for all the help...

my info says that if the car have a switchblade key the you may bypass with 555u. the car with "Smart Key" doesnt have a bypass available at this time.Houston,TX

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