tom1807 is right !
Maybe newer firmware (ie TH3.00 for 1460TH., TH2.80 cannot use FMTraffic)
Newer map (ie TSMV10 cannot .,, FMTraffic have to use with TSMv11)
Newer reciever (ie only GTM35 in Thailand)
It seems FMTraffic in Thailand (I guess Malaysia too) need a supported nuvi + firmware that come with Trafficprovider.xml + Specific GTM (Registered)+ Specific map. :)