Get the car open, go to Wal-Mart and visit the jewelry/watch display, grab a 2 pack of 2032 battery and change battery in them 3yr old remotes.
I dont like it when I get car with "intermittant black dash/dont see remote"
concern and it wrote up as warranty.. likely aged/weak battery in remote, and I get paid for 12 minute time (testing/replacing remote battery that is customer pay) ,,, add in the FREE 30+ to verify all is well that warranty not paying for because there is nothing wrong with materials-workmanship with car...
Todays car fits above (along with a few other I got stuck with).. test battery weak (tech discretion to numbers on Hyundai tester as there is no published values from Hyundai as to good battery/weak battery)..
Install new battery so I know remote has plenty of electric and able to transmit strong RF signal.. customer only left 1 remote.. I suppose they dont have a 2nd, or they dont use it, so battery not discharged like remote that is used constantly and battery used up.
GDS all modules for fault, no DTC recovered anywhere.. start car, works every time as tested randomly throughout the day.. No problem found, no warranty pay for the GDS and random testing, that be on my dime.. customer will be buying the battery for the remote though
Replace your remote batterys every couple year, them tiny wafer battery dont last forever.
Use your key once in a while in the cylinders to keep them loose and able to rotate.. they'll get stuck from lack of use... trunk latch is really bad offeder due to dirt back there.. had to rattle the key-cylinder on a Genisis to get trunk cylinder to rotate to unlock/open trunk..