The 2003 Honda Civic has single overhead cam (SOHC).
The 2003 Honda Accord has double overhead cam (DOHC).
The 2003 Honda Pilot has single overhead cam (SOHC).
The 2003 Honda Insight has single overhead cam (SOHC).
The 2003 Honda Odyssey has single overhead cam (SOHC).
The 2008 Honda CRV has a cam (timing) chain the normally requires no maintenance.
Your 2003 four-cylinder Honda CRV has a timing chain. No maintenance is required and they are normally replaced during a complete engine overhaul.
Honda's recommendation is 105,000 miles.
It does not have a cam belt it has a cam chain that requires no replacement.
The 2012 Honda Fit has single overhead cam (SOHC).
The 2013 Honda Crosstour has double overhead cam (DOHC).
The 2006 Honda Civic has single overhead cam (SOHC).