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check fuses and relays--have vehicle scanned most auto stores offer this service for free if theirs a pending fault cruise may not work -- possible switch malfunction-check brake lights including 3rd brake light relays and brake light switch -
There is a switch that links the brakes to the cruse control unit it works off the brake light switch . You see the crouse control needs to know when the brake is applyed so if you hit traffic it will shut it off . This is likely your problem look under the dashboard it will be close to the brake switch on the top of your pedal and have a wire connecting to that switch
I guess the cruse is'nt working? You first need to look it over to see if everythings hooked up. Did it work for you before or you haven't seen it work? The switch on the dash will light after turning it on but the car has to be running for it to turn on . Does the light light? if not check the fuses and see if thier any blown? To check to see that everything is hooked up find the throttle body, one cablr goes to the gas pedal and the other goes to the cruse, follow this cable to the cruse unit and see if that unit has all it's wires and hoses connected. To check you remove them and reconnect them looking into the plug or hose for dirt rust bent pins. The hoses can crack on the inside and leak which will make it not engage. Follow these hoses to where thier connected to the engine and the brake pedal as they can split and be disconnected there too. The brake pedal switch has to work too as does the clutch switch ( if it has a clutch) If the brake lights don't work niether will the cruse. The hi mount brake light if the bulbs fail the cruse won't work. The switch on the steering wheel can get disconnected too as it's on a clockspring circuit as the steering wheel has to turn. Is the airbag light on? if it is and the horn does'nt work either it's likly that the clockspring is broken, If the horn works and the airbag light cycles like it's suposed to then the clockspring is likly OK. The speedometer has to work too as the speed senser that works it also works the cruse.If everything is working your problem could be more seriuos but it's not likly as this unit is quite reliable.
I had the same problem. When I tried to engage the cruise control, the cruse control light flashed and the cruise control did not work. I also noticed that this happens more often when the outside temperatures are low (below 5 deg. C). The problem was in the brake switch. The switch is positioned at the brake pedal. On Accord 2003 it can be very easily removed by anti-clockwise rotation of the switch. You can replace the switch with a new one or you can clean the contacts of the old one, since the switch can be dismantled very easily.
if pulling up on the brake pedal worked, lets start there. I'm not sure on that specific car, but there should be a white switch on the brake pedal bar up under the dash that turns on the brake lights when you push the pedal. It would also turn of the cruise. those switches are adjustable. it should skrew in and out. if that is the problem, you've probably been driving around with the brake lights on all the time.
Pull up on the brake pedal. If that does not work check your brake light bulbs (LED brake lights will also keep your cruise control form working). Finally check all of the fuses. This system needs at least 3 different fuses to work properly.