Question about 2003 Chevrolet Silverado 1500
The vehicle has two differant brake switches . One is pined through the top of the brake pedal and controls the light functions and warning circuit . The other switch is connected to the cruise control the VCM and the transmission for the simply reason that these systems need to know when the brake is applyed to shut the cruise control off or else you would have a big problem if you hit traffic its a fail safe system. The second switch is up under the dashboard near the steering coloum and has a wire comeing from the connector from the first brake switch its a rectangler black plastic box. It could also be a viraty of other connections to the cruise control unit or it could be that the unit needs to be replaced but its not cheap so i would test this first check connections and voltages . The vehicle will still run fine with out the cruise control unit so try disconnecting it this will give you more information about where the problem is and eliminate the VCM and the transmission from the loop then the problem would be confined to the second switch or the cruise control unit it self
Posted on Mar 16, 2011
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Posted on Jan 02, 2017
SOURCE: cruise control won't work
Does the on light in the dash come on? If not, you may have a broken switch in the steering wheel which is a fairly cheap repair. Otherwise, the controls work through the Printed Circuit Board in your dash (your instrument cluster) and the problem could be as simple as a solder defect or faulty component. The problem is that no Ford Service Technician that I know will touch this and tell you that you need to replace it.
The instrument cluster is very easy to replace but may cost you a few more dollars than you want to spend. I would have someone with an electrical background check the cruise control switches in your steering wheel with a multimeter before going any further with this. Also check the wiring for resistance leading from the switch to the cluster.
Posted on Aug 06, 2008
Dave, I am sorry I can't help you, but it sounds like you know what your doing, all I can do is offer you the troubleshoot guide, for a ford car cruise control, which should be the same. You can purchase for 20.00 on alldatadiy.com and it will give you all service info on your specific vehicle for a year. I think it is well worth the money, and generally when I need to repair any vehicle with problems it has been a life saver. I am pretty sure the electronics for this are contained in the cruise module it's self. Alldata will have a trouble shooting guide that will walk you through the repair. It could be the actual button on the steering wheel, it could be the module. You can buy these pretty cheap if you go to car-parts.com and put in what you need. Of course these are used but most yards give a warranty on them.
Posted on Dec 15, 2008
Check your brake light switch at the pedal. This controls the lights and disengages the cruise when stopping. I'd look there before I go anywhere else. There may just be a wire loose. Could be a simple fix.
Good Luck and hope this helps.
Posted on Mar 15, 2009
Did you have the recall done on it ?
recall 05S28. Description: Speed Control Deactivation Switch.
It could be a blow fuse in the recall harness, if you did have it done.
Try the self test, and see what the results are. If you do not get it into self test mode, it could be the fuse in teh recall harness that is blown. The 1st revision of the recall harness was an inline ATM fuse, not sure if the revision 2 was the same. If that fuse is blown, the switch is leaking, and should be checked.
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.
1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.
The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.
There will be a slight delay when the last button is pressed and the lamp flashes.
3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).
Posted on Feb 23, 2010
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