Hood Latch Switch Bypass

[Linden16]

33 minutes ago, TenshiWingusu said:

I hear ya. I would check the resistance on the new switch in both positions, you can force the latch closed with a screwdriver then pop it with the interior hood release. If the switch is in the spec mentioned above it's either bad wires somewhere or the control module has issues.

Yeah hey. I wonder if the dealership can silence the alarm that would be perfect as long as theres no ringing id be happy lol

[Linden16]

On 2019-02-18 at 11:18 AM, TenshiWingusu said:

I hear ya. I would check the resistance on the new switch in both positions, you can force the latch closed with a screwdriver then pop it with the interior hood release. If the switch is in the spec mentioned above it's either bad wires somewhere or the control module has issues.

Do you think if I unplugged that sensor and got a aftermarket remote start would it work? Or would the aftermarket remote start still need to know that the hood is closed so would have to stay plugged in

[nissyota88]

Can someone please show me a wiring diagram and pins on bcm. This truck got in a wreck and has a different wiring harness, but came stock with a hood switch with no pigtail

[nissyota88]

Bump

[nissyota88]

Bump

 

[jaytee10]

On 4/20/2019 at 1:54 AM, nissyota88 said:

Can someone please show me a wiring diagram and pins on bcm. This truck got in a wreck and has a different wiring harness, but came stock with a hood switch with no pigtail

What model year truck do you have?

[Nick1220]

I have a 2008 Chevy equinox that the factory remote start stopped working on. No service engine lights. No indication that a door or hood is open. I’ve changed the gas cap and even checked the tire pressure even though no lights indicated such problem. However I’m still having the same issue. The remote start won’t start the vehicle. The key fob locks/ unlocks the vehicle any and every time a button is pushed. Even illuminates the light when attempting to remote start but it’s like the process just stops. I’m lost definitely could use some ideas and can’t afford a garage to fix it. 

[ride_z71]

One evening my 2018 stock alarm went off...I thought I must have hit the panick button on my remote...

The next morning I could not remote start the truck...

I get in, start it, and my hood open message was on with my check engine light...I checked the hood several times and it was opening and closing as it should...

Searched and found this post, measured the resistance between the black and red wire on the hood sensor connector and it read 529 ohms ope or closed.

Replaced the hood sensor and it fixed the open hood message and then I had to clear the code...

 

Tempatures were in the 20's to 30's and I had 51,000 miles...Makes no sense.

[ScottC19]

Hey Everyone, just had this problem on my 2018 Silverado LT. I think i found the issue. If you go to the hood with it closed and push down lightly on the hood even with your finger it will have some play. Open the hood, there are 4 rubber "standoffs" i'll call them. They keep the hood a certain distance from the plastic cover on the inside. turn them to the right they go down, turn left they stick out further. I just loosened mine so the hood would stand off the truck a bit further this makes the hood engage the latch more to hold it down. I think that movement of the hood was making the sensor think the hood was open because there was no pressure against the latch from the hood. 

[ScottC19]

On 2/17/2019 at 1:57 PM, Linden16 said:

Yeah its the whole late assembly correct. So i installed that and still have the same problem yup.. not sure what else could be causing it. And like i said it only rings when the trucks cold. After a few minutes of driving it stops

Hey Everyone, just had this problem on my 2018 Silverado LT. I think i found the issue. If you go to the hood with it closed and push down lightly on the hood even with your finger it will have some play. Open the hood, there are 4 rubber "standoffs" i'll call them. They keep the hood a certain distance from the plastic cover on the inside. turn them to the right they go down, turn left they stick out further. I just loosened mine so the hood would stand off the truck a bit further this makes the hood engage the latch more to hold it down. I think that movement of the hood was making the sensor think the hood was open because there was no pressure against the latch from the hood. 

[Jason56]

Hey y’all just wanted to post that I tried the resistor and it worked!  I bought 2.2k ohm resistors off Amazon and soldered it in.  I was getting +\- 520 ohms with the hood open or closed so I knew it was the sensor.  Thanks for posting!

Edited February 28, 2020 by Jason56

[jagabom (Esquire)]

20 hours ago, Jason56 said:

Hey y’all just wanted to post that I tried the resistor and it worked!  I bought 2.2k ohm resistors off Amazon and soldered it in.  I was getting +\- 520 ohms with the hood open or closed so I knew it was the sensor.  Thanks for posting!

Can you post a link to the resister?

Thanks

Jim

[Jason56]

https://www.amazon.com/Projects-10EP5122K20-2-2k-Resistors-Pack/dp/B0185FKB2S/ref=mp_s_a_1_3?keywords=2.2+resistor&qid=1583012836&sprefix=2.2+resis&sr=8-3

[gmgmgmgmgm]

The resistance values (ohm's) stated earlier in the thread are correct, ~740 and ~2.2k ohms for opened and closed respectively. The linked 2.2k ohm resistors should work fine bypassing the switch.

 

For anyone having the issue, GM has a TSB out for this specific issue as well, regarding loose/bad grounds. If the resistance values of your hood switch are within spec. You may have a bad ground.

 

In my case it turned out to be caused by the ground braid (labled 3). Under the hood on the drivers side firewall. It is a thick braided flat steel cable bolted to the body cowl, bolt was lose an jiggled around. Throwing hood sensor codes (short to battery & open circuit). You may need to check the opposite end of the ground braid as well on the left rear cylinder head.

 

https://imgur.com/a/kddguGK

 

 

 

 

[KCAudio]

I have a 2014 Sierra Denali 1500. The hood open alarm comes on when I have to much going on inside the truck, for instance if I have my AC full blast and AC seats (passenger/driver) going all at the same time the alarm will start to chime. I unplugged it before and it stopped. I was able to continue as normal. I am not to sure if it’s just the hood sensor or if the problem may go deeper, like to the BCM. Can anyone let me know if changing the sensor out would be the fix?

 

Thanks