Did the ICX remote not tell you why? If I pull the plunger out of mine the red and green lights will flash, it beeps, and the display states "EMERGENCY BRAKING STOP IMMEDIATELY". I have not had one fail, but had others talk about it when I had my 5'er. I carry a spare, but you have to wonder, the plunger type switches are widely used in the RV Industry, why has someone not come up with a better version?
2007 Fleetwood Excursion 40E
2007 Chev Classic CC LB D/A - Toad
2013 Jeep Sahara Unlimited - Backup Toad