"Switches" under the hood

[CJ7 and 4 wheel drive]

OK I know there are a lot of switches under the hood on my JLU but there are two that have bugged me ever since I first lifted the hood on my Jeep. They are on the right front under the hood. They look like plungers more than switches but I can see wires coming out of the bottom. They are pushed in when the hood in closed.

Are these to indicate the hood is open?

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[Reinen]

Those switches put the "Is your hood open or are you just happy to see me?" Jeep on your dash.

 

[mwilk012]

Yes

 

[Dgr401]

The switch closest to the driver side fender is the switch for the ESS start/stop system.

 

[CJ7 and 4 wheel drive]

The switch closest to the driver side fender is the switch for the ESS start/stop system.

OK how does that work? I don't see how the hood being open or closed has anything to do with the ESS. Besides, that switch was hung in the down position. A very small drop of oil solved that problem.

 

[Dgr401]

OK how does that work? I don't see how the hood being open or closed has anything to do with the ESS. Besides, that switch was hung in the down position. A very small drop of oil solved that problem.

Check out this video, it shows what the switch is for and how to disable the ESS system. The ESS system will not work if the hood is open, just one of many reasons why the ESS system won’t work. Your switch being stuck in the down position would satisfy the ESS system that the hood was closed but in reality it could have been open, of course you won’t drive with the hood open lol.

 

[CJ7 and 4 wheel drive]

What does the other switch do?

 

[Dgr401]

The other switch warns you that the hood is not closed. A warning light appear on the dash cluster stack.

 

[Mad Hatter]

The sad story is that NEITHER switch triggers the alarm system if the hood is opened by a Ne'er-do-well. "Hmm, nice Wrangler you got there...going to dinner now? We'll watch it for you..."

That is why we have accessory Hood Locks from Mopar, Bolt, Rampage Products, and likely others. After waiting almost a year for the original Mopar hood lock in 2018-19, I finally received the kit, which included a new grill insert. With the Mopar kit I had to manually key the lock core to my ignition key, tumbler by tumbler; it worked, but what a pain. I later bought a Bolt trailer receiver lock, and I can affirm that their one-turn-key-to-your-key system is both amazing and convenient!

I believe one of the Tazer devices can use one of the switches for alarm purposes, but I have no experience to confirm.

Good luck!

 

[Headbarcode]

The sad story is that NEITHER switch triggers the alarm system if the hood is opened by a Ne'er-do-well. "Hmm, nice Wrangler you got there...going to dinner now? We'll watch it for you..."

That is why we have accessory Hood Locks from Mopar, Bolt, Rampage Products, and likely others. After waiting almost a year for the original Mopar hood lock in 2018-19, I finally received the kit, which included a new grill insert. With the Mopar kit I had to manually key the lock core to my ignition key, tumbler by tumbler; it worked, but what a pain. I later bought a Bolt trailer receiver lock, and I can affirm that their one-turn-key-to-your-key system is both amazing and convenient!

I believe one of the Tazer devices can use one of the switches for alarm purposes, but I have no experience to confirm.

Good luck!

Yes, the Tazer has a feature that allows one of those plungers to activate the alarm if someone opens the hood. I can most definitely confirm that it works as intended, because I forgot all about that feature and set it off when I went to install a winch shutoff solenoid. The factory horn is no slouch when it comes to volume, especially when standing right in front of the Jeep. I damn near pissed myself when it went off.

 

[roaniecowpony]

OK how does that work? I don't see how the hood being open or closed has anything to do with the ESS. Besides, that switch was hung in the down position. A very small drop of oil solved that problem.

It is there to prevent the ESS from working when the hood is open. There are probably other scenarios, but one is that a driver could stop the vehicle and hold the brake pedal while a person opened the hood and had their hands in the path of the rotating components and the drive let up on the brake pedal slightly that allowed ESS to start the vehicle without moving.

Similarly, my GM truck with remote start, will not remotely start with the FOB when the hood is open for similar safety concerns.

 

[XX4XEXX]

@ECRI-Kevin

If I'm not mistaken ECRI is writing the data to allow switches to alarm once hood is opened when alarm is energized.

FYI I highly recommend ECRI they are hands down one of the best. (NOT PAID TO STATE) lol

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