Did you happen to take the old FOB apart and look at the circuit board? Indian Dealers said the Vintage doesn’t have an alarm, but it does… My ‘14 Vintage for example had a no button FOB, but the circuit board had 1 micro switch. (SW1) Sets the Alarm and would lock the hard bags. (SW2, not installed) Would disarm the Alarm and unlock the hard bags. The Alarm will also disarm if, with the FOB in range, you bring the bike to an upright position or hit the power button.
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You could either press hard on the No Button FOB and set the alarm or just buy a new case with buttons. My original FOB case was cracked so I bought a new one … around $40.
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So check the circuit board and see if it has a micro switch … test it … if it works you just need a replacement case with buttons …
If you do need to buy a new FOB the VCM can store up to 4. So the dealer can program the new one without erasing the old one. You’ll have a back up.