Door keypad inop - '00 GM

The keyless entry pad quit working, can't lock/unlock anything. Noticed that the 9/0 button doesn't illuminate when a key is pressed (and of
course, 0 is part of my combination). The other four keys do light up.
I suspect there's a problem with the keypad assembly. I did check the connectors inside the door, just to be sure, and they are secure.
Is the keypad a common failure item?
TIA for any info.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.