2002 olds van, lower brake lights, traction control and cruise control not working. Have tried new brake light switch, cruise control module from a salvage yard and still not working. Have been told by several mechanics it was probably multi-function switch but have also been told if turn signals are working it wouldnt be that either.Any ideas
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The multi-function switch is a few switches housed together in one unit. Just because one operation of the unit functions does not mean the others are ok as well. In most cases, the multi-function switch is the cause. \
You can use a multi-meter and test voltage input and output to be certain. http://www.freeautomechanic.com/wiringproblems%206.html
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