Yes, I would say the brake light switch is okay.

Have you checked that the CC actuator cable is connected to the throttle?

Dave

 

+1, Dave

Also check the cruise control pulley on the throttle body. It's made of plastic and can break easily (guess how I know?)

Speaking of which, has anyone found a replacement CC pulley without having to buy the entire throttle body? Even better yet, one made out of metal? If not, methinks
I'm going to pull one from the boneyard and have the local 3D printer guys make a reliable one made out of metal.

I can't wait until 3D printing is mainstream so hacks like us Ody gals & guys can improve the factory parts as needed. Or even better yet..."Mr. Cervenka, would you like the updated converter lock up valving, internal cooling jet, and correct 3rd clutch pack bearing in the tranny we're printing for your '03 Odyssey today?" Yes, please! LOL

 

I think the brake light switch has two different switches in it. One normally open (brake lights) and one normally closed (cruise control) when the brake pedal is not depressed. Look up a diagram of that switch.
Not sure what you mean about a dash light coming on/off? when the brakes are applied.
I would guess that you need a new brake light switch. Remove it and test it.
Buffalo4

 

I think he meant the CC dash indicator light goes off when he presses the brake. If so, this is correct behavior for the brake to cancel CC.

Dave

 

Yes that's what I meant/I'm thinking.
I will check the actuator cable.

Thanks,
ggparts

 

For what it's worth, my wife's '05 Taurus started to accelerate on it's own. It was a very slight acceleration, nothing severe or dangerous. You didn't even notice it with normal driving, it was only evident when you were coasting at a slow speed. Instead of rolling along at a constant idle speed, the car would go a little faster, a little faster, a little faster. In addition, the CC did not work. My research pointed to a CC cable bracket that was known to break, which removed tension from the cable and caused the acceleration.

When I looked at the cable on my wife's car, the bracket was intact, but the very end of the cable wasn't attached to the spring loaded actuator (?) at the throttle body. This "lack of tension" produced the same symptom as the broken bracket did. Nothing looked broken, so I reattached it to the actuator and the car ran fine for about month and then the symptoms returned. I checked the cable and it was off again.

It was strange since the normal operation of the cable causes it to be pulled against the actuator, not get pushed, which is what was required to get it off of the actuator. No matter how much I played with the cable, the throttle or the actuator, I could not get it to come off. It couldn't have been related to the use of the CC, because my wife never, ever, ever uses the cruise control. I don't think she even knows how to use it.

Anyway, I took a small cable tie and wrapped it loosely around the CC cable and it's attachment point, just tight enough so the cable couldn't pop off but not so tight that anything was binding. It's been working for over a year, so I'm pretty sure your mechanic will be able to rig your's so it stays where it belongs.

Good luck!