which RSM r u talking about? the blue screen or the first model with 4 buttons??? my L9 seems to be working fine...assuming all ur wiring is correct since ur RSM has speed readings, i suggest u set the tire sizes until u get the same reading on ur speedo meter and ur rsm(but i still think this is not the reason).... if still got speed cut, then it could be ur Kelisa Speedmeter faulty...lastly, maybe ur rsm is faulty..... speed setting and reading will rely on the right pulse(P4), speed cut set at 130 for Kcars and tire setting... the rest is not important....
however, u can manually cut ur speedwire(the easy but not reliable way) but u'll have to suffer a very bad fuel consumption since ur ECU cannot read ur speed ALL the time... i tried it once, proven so u cant deny it.... L5 and above will not loose its power steering if u cut the wire, not like L2....
mind telling us ur RSM setting??? maybe u set wrongly somewhere....