Hood Latch Switch Bypass

[jrmcswain]

On 3/2/2020 at 3:29 PM, gmgmgmgmgm said:

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

 

 

 

 

How did you tighten the bolt in the head? Hennessey had the heads off when they were installing the cam and supercharger. The ground is loose for sure. Thinking about trying from underneath.

 

 

[jrmcswain]

2 hours ago, jrmcswain said:

How did you tighten the bolt in the head? Hennessey had the heads off when they were installing the cam and supercharger. The ground is loose for sure. Thinking about trying from underneath.

 

 

It was 13mm, I could only get to it from underneath. Seems to have solved the hood open message. I could no longer get the message by using the window switches.