Is this happening to anyone? I can set the cruise control, it'll work for a minute, then cut out after hitting the slightest of bumps on the road.

 

First, it is not factory cruise control it is an after market kit. Therefor you need to double check the system to see if anything is loose or worn.

 

I forgot to reply to this. You're right. I found out the '04s never had factory cruise control.

I didn't think I could search by picture, but sure enough, here's what I have...
http://www.jcwhitney.com/custom-crui...=d17236y2004j1

I'll find out about it and see what's up.

For anyone else who has something similar, here is the page for product manuals:
http://www.rostra.com/main/rostra-support.html

 

Sounds like you'll have to check all connections from the CC wiring harness to the various in-car connections - perhaps starting with neutral safety switch and brake light switch (the connections to these, not necessarily the switches themselves).

 

I added Rostra CC to my 2006 after buying it. That JC Whitney control stalk in the picture does not look like what I have, and I don't think a link to the manual for our old xBs will be found on the Rostra page posted.

I do have a PDF Rostra CC installation manual for our cars that I could email you.

I would check the big terminal block under the right side of the dash. The Rostra power wire is pushed into another wire's socket there. On my car, the wire for my aftermarket moonroof was already pushed in there, and when the Rostra installer added the CC's wire, he loosed the moonroof wire, and after a year of being jiggled by bumps it fell out so the moonroof lost power.

So maybe your CC power wire is loose in that terminal.

 

Toyota cruise controls tend to allow a push up and down on the lever. I have an 04 and it is definitely not a factory one.

 

Check the wire connections to the car's computer. The two wires (neutral Safety, and speed wire) can sometimes come loose. Make sure those connections are solid and you should be good!