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At the very least you can check the fuses, if you haven't already. Also, check for applicable trouble codes relating to the cruise control. Around here some of the national brand auto stores will check codes for free. Make sure the brake lamps work.
The diagram is part of the cruise system, if you need the other part holler. I just posted the part with the fuses.
Look at the underside of the main fuse box under the hood and the diagram should show you the size of each fuse and the relays as well as the function of each. Other fuse boxes will also have the same information, but I believe the main fuse box has the ABS and cruise in it.
Fuses are a great place to start, if not fuses the actual cruise control switch may be to fault. Rear heater do you get heat out the front and if so is there a fuse for a rear fan maybe a blower.. Let me know
The brake light switch can prevent the cruise from working. On the cars there is a 5amp cruise fuse so I would think there is one for trucks too. You may have to get a shop manual to get the diagrams to check the circuits and have a test procedure.
Gotta tell you, this question had me a little confused. Below are 2 wiring diagrams for you. One is for the cruise control circuit and the other is for the air conditioning circuit. The reason I gave you those is because it seems according to the wiring diagram in the cruise control that the fuse for the cruise control goes to the HVAC (air conditioning). According to the wiring diagram for the A/C yes that fuse also controls the ignition power for the A/C controller. In any case the fuse that would cover the cruise control is the number 30 fuse in the fuse panel located under the hood of the vehicle. Below is a picture of the location of the fuse panel and also fuse layout diagrams for the 6 cylinder and 8 cylinder engine vehicles as they have different layouts depending on the engine size. I hope this helps you and good luck.
CRUISE CONTROL PROBLEMS CAN BE CAUSED BY FUSE OR FAULTY BRAKE LIGHT SWITCH OR BLOWED FUSE TO BRAKE SWITCH.YOUR CRUISE CONTROL SWITCH COULD BE FAULTY.BEST TO TAKE CAR TO DEALERSHIP LET THEM HOOK CAR. TO DIAGNOSTIC EQUIPMENT.BECAUSE CRUISE CONTROL IS ELECTRONIC AND PCM CONTROL.THE CRUISE CONTROL SYSTEM USES INPUTS FROM VSS SENSOR .SO IT WOULD BE HARD TO FIX AT HOME YOU NEED EQUIPMENT TO FIX AND TROUBLE SHOOT.
There should be a fuse specifically for the cruise. Look in the owners manual to find out where your fuse box is located, then there will be a diagram of the layout of the fuses. Check the fuse that coresponds with your cruise control.