Question about electronic signals in a 2004 Tahoe (key in, door open)

[Vincent Mitchell]

Is there electrically a way to tell if the key is in the ignition or the door is open? As in, power exists or does not at a specific fuse block point for each of these cases? I would like to know for both if possible. Thanks.

 

[S33k3r]

There are switches in the driver and front passenger doors; that's what gives you power until you open the door. There is also a chime that lets you know your key is still in the ignition, if you open the driver's side door. That's all I can think of.

 

[Vincent Mitchell]

There are switches in the driver and front passenger doors; that's what gives you power until you open the door. There is also a chime that lets you know your key is still in the ignition, if you open the driver's side door. That's all I can think of.

Thanks, I am needing a way to know from the power that is present or absent from the wiring harness that is hopefully running through or at least next to the fuse panel in the passenger compartment. I could test it all but I was hoping someone had already done that.

 

[exp500]

Not quite sure what your objective is for end result, but this will tell ya what the circuit is doing. Then the service manual for closest connector/ fuse/ switch.
Vxdiag VCX Nano for GM/Opel Diagnostic/ECU Programming Tool

 

[Vincent Mitchell]

I am trying to build a circuit that makes use of knowing when the key is in the ignition and also when the door is open. i will get out the meter and find out the long way. I was hoping some had already tapped at least one of these things.

 

[exp500]

Recommend you be very careful in your approach, as it appears you may be into the anti theft system.
That is one of the biggest drawbacks to an aftermarket alarm- look thru the posts. Most remove them. But that also leads to the installation instructions which could be very helpful to you and easily obtainable.Ebay is full of links or search terms.

 

[Vincent Mitchell]

Thanks, I am not going to disrupt the signals, I just need to be able to tap them. This project isn't for an alarm/intrusion function.