Green Light? What's it for?

[RoarinRow]

I picked up this gently used 2002 2500HD which came with a tow package. For the life of me I don't know what this green light is for. It's to the left of the parking brake release lever. I noticed it during the test drive and the dealer didn't know what it was/is either.

 

It blinks while and driving and not when I'm not. In fact it stays on all the time. Could it be part of the alarm? Usually alarm status lights are red? I tried to trace the wire but there is no slack and does directly under the dash somewhere.

 

Any ideas? See attached picture.

[Coby7]

Probably an aftermarket remote start alarm module.

[RoarinRow]

Probably an aftermarket remote start alarm module.

 

Could be. I'll bring it to a shop and see what they say.

[davester]

is it just a light or is it a little box? are there any controls on it? It might be a trailer brake controller.

[RoarinRow]

is it just a light or is it a little box? are there any controls on it? It might be a trailer brake controller.

Just a green light. Can push it down from on top or behind. It's like a half inch by half inch square with a green light in the middle.

[davester]

Yeah, probably not a TBC. Could be anything, probably need to follow the wires and see what it hooks up to.

[Colossus]

toes it have a little switch on the back of it?

[RoarinRow]

No switch on the back of the light. Just the wire which I will have to trace at some point. I wonder if it anything to do with the extra trailer outlet in the bed of the truck?

[Colossus]

on my 08 Sierra, the dealer I purchased it from had installed a dealer alarm/anti theft system in it that had a light like that, only it had a very small toggle switch on the back. It was tied to the on board security system so I never did remove it.

[RoarinRow]

on my 08 Sierra, the dealer I purchased it from had installed a dealer alarm/anti theft system in it that had a light like that, only it had a very small toggle switch on the back. It was tied to the on board security system so I never did remove it.

Thanks I will need to check it again. Too cold

[RoarinRow]

Today I took a better daytime picture. What do you know there is a button behind the light. I am able to depress it. However it doesn't seem to do anything when I push it when the truck ignition is on or off. Need more investigating.

[carkhz316]

A lot of box for a simple LED indicator. I'm guessing a remote start or alarm system of some kind. Trace where the wires go and keep us posted!

[RoarinRow]

Found it! I look a walk around the block at work and when I got back to my truck I noticed a sticker that said 'Karr Security Systems'. I Googled it and found the same exact wiring and green light that other people have posted. Apparently it is an aftermarket alarm system that the dealer puts in that integrates with the existing factory key fob.

 

Why it blinks while driving and not when parked is beyond me. I'm thinking the whole purpose of the alarm is to show the flashing light when the car IS parked and off when driving. Oh well problem solved, thanks to all that replied.

[davester]

maybe see if you can find a manual for it to determine how exactly it is supposed to "secure" your truck...

[RoarinRow]

I tested the alarm briefly and know it works. It is very basic since it integrates with factory key fob. There is nothing in the truck worth stealing except the truck itself lol. People will look in it see 3 car seats and hopefully give it a second thought.