I read the original post as asking if having tires sold and installed by someone else could void the warranty. Some people (dealers?) try to push the idea that all service has to be done at a Honda dealership for the warranty to remain valid, so it is not that far fetched a question. It may depend on where you Live but here service can be done anywhere, but you need to keep receipts.
And, actually, tires can impact the warranty if you get tires that are a different size than the OEM tires. My dealer's sevice guy told me they go by a 3% rule, so 225/70R16 would be ok to replace the OEM 235/65R16, but 50s would not.
Nicolas