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Buy a cheap multimeter and measure your voltage at the bulb when the brake lights are supposed to be on. You should have 12vdc. Is your 3rd brake light and brake lights on the same fuse? If not, measure to see if you have 12vdc at the fuse itself.
check cruise control fuse and check the brake lights see if brake light working because the brake light switch will deactivate cruise control when brakes is applied.if brake lights dont work either fuse blowed or switch bad.if all is good have vechicle code scan because cruise control control by PCM and vechicle speed sensor and thottle actuator control motor.
The power to brake lightlights goes through the signal switch, have some one watch while you hold brake pedal and wiggle signal lever to see if lights come on, if they do then its a bad signal switch, also check to make sure the hazard button is not on, try turning on the 4way flasher and then try brake
The body mounted brake lights, are on a different fuse than the upper light. Check fuse #12 a 25amp fuse in the fuse block under the hood on
the left fender. The upper light fuse #16 a 10amp fuse in the rear fuse
block, under the left side of the back seat. Hope this helps.
Solution to your problem ...
1- I purchased from 1aauto.com a pair of Circuit Boards for my Chevy Venture 2003 for 85.00 $ ..free shipping
2 - I Installed them both , all lights now were not working at all. So I checked them and they were all burned ...So I purchased new ones ....Everything was working fine now but now my signal lights were not working left and right .....Checked the fuse box next to the passenger side door .... It was burned .
Changed the fuse / Signals are working fine now ....All is good
I just did this yesterday evening August 12, 2008
Conclusion ..Change everything going forward so you do not need to run around like I did from one store to another!