Thread: Transform a Nuvi 37xx in a Nuvi 34xx for dummies

Originally Posted by Chippie

Until now i haven't tried another one but I think you are right. The symbol is grey and also in the 'hidden menu' there is a string gtm25: not found or not detected

Thanks for your help :-)

Try cleaning the mount's usb port and the GTM35's plug with contact cleaner. Also use WebUpdater or GarminExpress to see if you are offered anything traffic related. Particularly updated GTMxx software because i vaguely recall there was a fix awhile back for greyed out icon and traffic lockout. If your current receiver still doesn't work after that but you manage to borrow another and find it works then your GTM's FM receiver is probably u/s.