Ignition or brake pedal possessed by the devil.

[MaleHoe]

A month ago I got home from a drive on a hot day turned off the engine and the ac and the headlights and taillights stayed on. I could turn the AC off and I could turn the headlights off but I couldn't get the taillights to turn off. I disconnected the battery the first time. It was a few more days before it did it again and this time I started it ran the gear shifter through all the gears and back into park and it all turned off. Yesterday I was turning it off and it did it again and when I went to start the Tahoe I put my foot on the brakes and it all turned off. You could hear relays clicking and crap going on after it felt like that stuff should have been done. The engine turns off normal it is just the lights and the ac blowers that stay on. So I am sitting there for a minute after it turned off when I pushed the brake and it turned back on, I press the brake again and it turns off then I mess with the brake and they turn back on... It is a 2002 so I feel like it is a short but I am not sure if it is in the brakes or the ignition or really what to do at all... anyone seen anything like this?

 

[OR VietVet]

The parts cannon could go nuts on this one. If you just want to take a shot and not spend too much money, sometimes you have to on very intermittent weird happenings, throw a stop light switch at it and look thru the threads here about ground problems on these rigs. Lots of them on here and a well known problem that causes lots of craziness here.

More Information for GM GENUINE D891A

 

[MaleHoe]

I ordered the brake light switch and will look into known grounding issues. Thanks for the info.

 

[rockola1971]

I would look heavily at the grounds being corroded. Especially the one behind the engine to the firewall and the one down on drivers side chassis near firewall. And then I would probably go ahead and throw a new ignition electrical switch at it too. They are stupid cheap and very easy to change out.

 

[Doubeleive]

my money is on bad ground, start at the battery and follow from there

 

[rockola1971]

my money is on bad ground, start at the battery and follow from there

Sure sounds like his BCM isnt going to sleep and brake switch is backfeeding. Dirty ground for BCM will definitely cause it to not goto sleep.