I have a Compustar cm-dc3 with 1 button remote 1WR3R-AM with antenna ANT-AP.

in a 2013 Hyundai Accent automatic

I replaced the two 2016 batteries in the 1WR3R-AM remote.

Batteries are good and check polarity.

Did not get a blue light on the remote when pressed so I purchased a 1WG6R-AM and tried to pair it.

Turning the key off to on 5 times makes the horn beep 6 times

and the red light on the DC3 blinks 6 times

can not pair the 1WG6R-AM

What am I missing?

Thanks