PC 1550 Ranger American?

QUESTION: Good Morning
I have a Ranger American PC 1550 unit in my home I just replaced the back up battery and it seems to work fine except when you key in your 4 digit code that sets the alarm with no problem but a bypass light comes on. Is this normal ? When you check to see if any zones show up as being bypassed it shows nothing Can some one that has a PC1550 let me know if there does the same thing
Thanks
Russ