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I had a 4 wheel drive suburban..it had issues with the high-lock and low-lock..I just used the auto setting because all four wheels were getting power anyway..only time you need lock is when you plan to go bogging in really deep mud..on snow/ice all you need is all wheel drive..you actually have better control..as long as it works in all wheel you should be fine..also be checking the front hubs.. are yours full time or do you have lock outs..on the axle hubs..thats my question
Try checking the small switch at the top of the brake pedal. There may be two one for brake lights and one for the cruise control. To ascertain what is what, pull one wire off and see if brake lights work. If not, then the other switch controls the cruise control disconnect and engage..I you have a DC test light check to see if power is on on both side of the switch with brake pedal up. If so, depress pedal and check power on the other side there should be none, if there is the switch is defective.
Check that the cruise control
module fuses are not blown in the fuse panel. Also make sure your stop
lights are working; cruise controls are designed to disengage when the
brakes are applied, and one method of sensing that is to monitor brake
light current.
Check the speed sensor. Look up the location at autozone .com or google. It is either near the tranny or at the passenger side wheel. The speed sensor is almost always connected to cruise control problems.
The light comes on indicating that the transfer case is engaged in 4wd, but that doesn't mean the hubs are locked. If you have automatic locking hubs, you should check to make sure they are working correctly. This GM vehicle may be equipped with vacuum locking hubs... meaning there is a vacuum line running from the transfer case selector to the hubs on each side. The vacuum makes the hubs lock into place. If those vacuum lines are damaged or missing, they wont lock. If you have electronic locking hubs, they may need to be replaced. Good luck.
There is an additional recall for the cruise control. The original recall added a fuse to prevent fires.
The new recall is about fixing a half dozen problems which include the transmission and brake lights and false dash warnings. It involves 16 million assorted years and models. It would certainly be a good idea to contact the dealer about your problem. The recall is free.
It is Torque On Demand. When you are stopped there is no need for
the front end to be engaged, no demand. Once you start moving, the lights should begin working as the demand for four wheel drive engagement increases, if the conditions require four wheel drive.
It's the way the system works.
Enjoy!
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