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Ground question

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rtm038

New Member
Hello,
I'm working on a project with my car and have a question about "grounds".

On my 2006 Ford, each of the (5) doors has a switch in the latch assembly that when the door is closed, provides a "ground" path to the vehicle security module. The vehicle security module monitors these ground paths. If the module "sees" ground, it "knows" that that particular door is closed. When any of the doors are opened, the contacts within the latch switch open and the ground path is lost. The vehicle security module "sees" this change in status for this particular door and now "knows" that the door is open and in turn, turns on the interior lights.

Now, what I'm looking to do is use these (5) ground paths to control the main ground path of a relay coil. Basically the circuit would work like so:

1. All doors closed: relay coil will energize when 12+vdc is applied to its coil
2. One or more doors open: relay coil will NOT energize when 12+vdc is applied to its coil.

Is this type of circuit possible?

Thanks
Ryan
 
Last edited:

Sceadwian

Banned
By the way the quotation mark was never meant to be used in such a manner. =)
I'm sure your dash has a door open light most cars do, you could feed that signal into a couple logic gates which would drive a relay.
 
Last edited:

Dean Huster

Well-Known Member
Certainly do not connect a relay coil directly to that door plunger switched ground as it will most likely "tell" the computer that the door is always open.
 

rtm038

New Member
By the way the quotation mark was never meant to be used in such a manner. =)
I'm sure your dash has a door open light most cars do, you could feed that signal into a couple logic gates which would drive a relay.

Ok, I'll look into that.
 
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