Most Perception checks are reactive, made in response to observable stimulus. Intentionally searching for stimulus is a move action.
That means that if you aren't using the movement action to spot a trap, you won't notice it. The exception would be a trap w/ observable moving parts (perhaps a swinging blade on a rope?) but those are very uncommon, in my experience. You might get a perception check (as a reaction) if someone stepped on a pressure plate, but that typically means the trap is sprung and it's too late anyway.
Also, the rogue talent Trap Spotter would be useless if you didn't have to actively search for traps.
The 'Just So You Know' item on this page right here should clear things up.
The original quote can be found here.
well uh
just tell your gm that you are looking for traps
"I move cautiously, warily, carefully searching the corridors for signs of traps."
either that or take trap spotter as a rogue
Uhm, is it possible your DM is a Richard?
Just sayin', perhaps you should play with a better quality of person.