'08 Silverado cruise control

[327chevy]

I posted an issue with the cruise on my truck before and at that time it was a fluke I thought that it wouldn't work because everything else worked fine.Well lately this problem has reappeared,at first only during wet,foggy or rainy days but I noticed that today being a fine day it still didn't set.Is there anything that I can check with a volt/ohm metre at home to try and narrow down a possible cause before I try and find a shop that can scan deep enough to see where the problem is?

[j cAT]

Originally Posted by 327chevy

I posted an issue with the cruise on my truck before and at that time it was a fluke I thought that it wouldn't work because everything else worked fine.Well lately this problem has reappeared,at first only during wet,foggy or rainy days but I noticed that today being a fine day it still didn't set.Is there anything that I can check with a volt/ohm metre at home to try and narrow down a possible cause before I try and find a shop that can scan deep enough to see where the problem is?

my guess is the brake pedal switch. this has many switches. not sure how poorly this is made by GM on a 2008 but on my 2000 I had a code come on that indicated the brake pedal ABS switch was always open. took switch out and I cleaned it up. no more code. I would drive it above 40 MPH put foot under the brake pedal to hold full up see if it then works. this then could also be the return spring made from low quality china steel . some one had this spring issue before brake pedal droop..

[327chevy]

Well that should be easy enough to check,thanks I'll try that tomorrow.

[ASJT3]

Originally Posted by 327chevy

Well that should be easy enough to check,thanks I'll try that tomorrow.

Same exact thing happened on my '07 Tahoe (same equipment as your pickup). Like j_cat said, tapping or holding the brake pedal in the up direction corrected the issue. Thanks for the pointer j_cat, I'll check the contacts in this switch, hopefully will permanently resolve my issue too.

As a side note, I've noticed as I'm sure you have too that a lot of the switch contacts in these trucks (windows/locks/liftgate handle) fail due to light surface corrosion (tarnish) on the contacts. Light buffing with an emery cloth usually solves the problem.

[j cAT]

Originally Posted by ASJT3

Same exact thing happened on my '07 Tahoe (same equipment as your pickup). Like j_cat said, tapping or holding the brake pedal in the up direction corrected the issue. Thanks for the pointer j_cat, I'll check the contacts in this switch, hopefully will permanently resolve my issue too.

As a side note, I've noticed as I'm sure you have too that a lot of the switch contacts in these trucks (windows/locks/liftgate handle) fail due to light surface corrosion (tarnish) on the contacts. Light buffing with an emery cloth usually solves the problem.

there are what is called burnishing tip files. I used these on marine electronics in the old days .. you want to polish the surface not scratch it.. dc voltages cause pits and tits. current flow always in one direction just like those ignition points decades ago. running some copper flat material over the contacts will clean them up. if pitted best replace switch .