5 Wire Door Lock System

I have a 5 wire alternating door lock system on my car that is operated by the alarm output and I want to add a double throw momentary switch for the door locks, 1 wire coming from terminal 30 of the relay locks and the same terminal on the other relay unlocks, when connecting the wires from terminal 30 to either side of the switch which wire do I use as a common on the switch. Yhanls

What kind of car???? yr make model?

Thanks, but still a little confused as to what the common wire should be, I want to use a double throw single pole momentary rocker switch, lock goes to one terminal, unlock goes to the other terminal what goes on the third terminal, is it the other side of the coil or am I trying to use the wrong switch       Lock....to lock relay coil       Common.. ?       Unlock...to unlock relay coil Bob

Thanks again

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