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LED tail light bulbs no cruise control

C

compudude86

CEG'er
Joined
Apr 28, 2011
Messages
414
Location
Algonquin, IL
Ok, so now I'm lost. I swapped my tail light bulbs for the LED ones (and the ones I got work very well with the lens and reflector surprisingly) had to change the flasher of course. but now, when the headlights are off the cruise control works. As soon as the headlights go on, the cruise control no longer functions. Anybody else have this issue?
 
the cc system is deactivated when the brake pedal is pressed. something with the bulbs must make the system think that the brakes are on and therefor deactivating the system. thats my guess anyway. maybe you need some load resitors to make the led lights act more like incondecent light bulbs?
 
Brapple that is what I thought until the "electrical engineer" in me kicked in... the cc works with the headlights/park lights off right? But I can be in cruise, hit the parking lights, and out goes the cc. What triggers the cc to stop? Voltage on the brake lights. So, I'm guessing that when I turn on the parking lights, the voltage to the parking lights must be leaking into the brake light circuit and onto the cc brake sense circuit. So it is possible that what brapple said would work, and the resistor should cut out that power bleed, or I could diode isolate the brake and park wires at the lights and stop it that way..
 
there is actually 2 switches on the brake pedal. one is the stop lamp switch, which is normally open and is used for the brake lights and goes to the brake lights AND clutch pedal position switch (normally closed) and then from there the speed control module. the second is the brake pedal position switch, which is normally closed and goes straight to the speed control module. when the brake pedal is pressed the SL switch closes providing voltage to pin 4 of the speed control module, at the same time the BPP switch opens, removing voltage from pin 9. im assuming that the BPP switch is there as a back up to kill the speed control in case you push the clutch at the same time as the brake, which would keep voltage from getting to pin 4 (no voltage at either pin and it kills the speed control?). now, it seems like what must be happening is when you turn on the parking lamps the voltage is going through the LED bulbs, and finding its way to the cruise module, thus killing the speed control. I would say you have either some bad LED bulbs or a bad ground for one or both of the taillights.
 
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