Black98LS1

the cruise control in my 99 t/a isnt working...the brake light switch isnt sticking, so where do i go from here; ive never had to work on a cruise control!

thanks

Phoenix 5.7

iTrader: (7)

check fuses, both underhood and on the driver door jamb.

00Vette

iTrader: (4)

There is a vacuum line that may be the culpret. Did someone work on your car recently?

Black98LS1

ive only had the car 3 days, and i havent touched anything yet...wheres the line at and ill check that out too

WhiteBird00

iTrader: (4)

There are literally dozens of things that will cause the cruise control to fail. For example, an over/under charged battery, a bad park/neutral position switch, binding throttle linkage, EMI on the speed sensor signal circuit, even burned out brake lights.

I have the diagnostic procedures as listed in the service manual but I would need some more specific details of the symptoms.

foshizl

my switch that is on the clutch pedal was my culprit... there are 2 switches on the clutch pedal one in front and one behind.... if i remember right the one in the front is the one for the cruise and the one in the back is for starting the car...

Black98LS1

I have already replaced all the bulbs that were burned out, battery shows full charge. Its an m6, and it wont turn over unless the clutch is in, so does that mean the park/neutral position switch is good also?!? Only thing im not sure about is the EMI on the speed sensor circuit. excuse my ignorance, but what is that and how do you check it???

Black98LS1

...and the fuse is ok too

WhiteBird00

iTrader: (4)

An M6 doesn't have a park/neutral switch - it's only on automatics.

EMI means "electromagnetic interference". That can be caused by a number of things but the most common is a high-powered stereo system incorrectly wired to run the power alongside the speed sensor wire. (It can also be caused by an atomic explosion )

What are your symptoms? Will it set but not hold speed? Does it not turn on at all? The diagnostic procedure is different depending on symptoms and usually involves using a diagnostic computer.

TWS

iTrader: (63)

Yep. Always check those. I had to screw the upper one down a few threads in both my '01 and '02 after installing Mcleod clutch master cylinders in both of them.

Black98LS1

the cruise wont set at all. I dont have my system in the car yet, and i'll have to check those switches on the clutch.

WhiteBird00

iTrader: (4)

I created a .PDF file of the diagnostic procedure for an inoperative cruise control. You can download it here. Of course, the first several steps won't be much use since they refer to connecting a diagnostic computer to the car.

WhiteBird00

iTrader: (4)

BTW, there isn't a fuse for the cruise control in the dash fuse panel. The fuse is a 15A mini fuse in engine wiring harness junction block #2 under the hood on the front of the left wheelwell.

Black98LS1

thank you so much for your help. i should be able to get it straightened out with that info!