On my daughters car again, she told me that the light was out on her clock, which I verified.(continuity) It is a lot smaller than The bulbs on the HVAC board. I can't find it but I remember reading thru some of the posts about somebody going to Radio Shack and purchasing a bulb and changing it out on the little plastic post that twists into the back of the clock??

 

Found this info by google search. Did this for the back light on some switches in my TSX>

Part number 272-1092 or micro lamp #7219 at Radioshack.

 

It sounds like the same bulbs that are used all over the dashboard / front console on Honda Odysseys (among others). We have an '05 and I have replaced many of those bulbs. You can buy the bulb+base from the dealer for multiple dollars each or buy the loose bulbs and re-use the existing base.