Latching circuit for fog lights

I was wondering if anybody knows how to make a circuit for fog lights that would act like the lights are controlled through the car computer.  It needs to be triggered on and off with a negative momentary signal, and it also needs to remember the state of the lights when the ignition is shut off.  That is, if the lights were selected to be on, and the ignition was cycled they would still be on.  It would need to only allow the fogs when the low beam lights are actually on, and turn the fogs off when the high beams are used.

This vehicle has driving lights, and automatic headlights so I don't know how that would affect the wiring.  I should be able to get negative outputs for the high beam, low beam, and driving lights, from the vehicle computer.

I could probably do this with a bunch of relays, but I thought there might be an easier way with some electronic components.  I thought this would also limit the current drain when the vehicle was off, and the fog light circuit was remembering the on state of the switch.  Any ideas??

That my friend is a tall order.

This is a solid state version

The 12v would be hot all the time and the output would hook as a switch between the fog light relay  and the low beam wire.

Thanks for answering my tall order.  I thought you guys sounded pretty smart here.  Will this remember the state of the fogs after the vehicle is turned off?

What transistors should I use(do you have a number)?  Also, what is the AQZ202 relay?  I don't do much with electronics.  Would I be able to get everything from say Radio Shack?  How much do you think all of this stuff would cost?

The relay stayes latched until you put a pulse on it again.

When the lights go off you just drop power from the contacts of the relay. The relay will stay energized but nothing will go thru the contacts untill lights are turned on again.

The only problem  see is a  drain on the battery if you leave it turned off for a few days.

Just about Any NPN Transistor will work. 2n2222 comes to mind .

Just incase here is a modified circuit so you can know where the pulse goes.

What happened to the low beam wires on the last picture?

I have DRL on the truck, and they are the low beam lamps without any park lamps or rear lights on.  I think the DRL use the same wires as the low beam lamps.  Is there a way to do this with a positive from the high beams to shut the fogs off?

How much drain will there be on the battery.  The relay will be energized all the time if the fogs were on when the vehicle was turned off?  Can this be done without the relay coil being on all the time?  Could you put another transistor in there somewhere, and use it to turn the relay on when the low beams are on?

The last picture was from another project. It is just a latching relay.

The circuit will get much more complicated as we add features to it.

I'm ok with that.  If you can draw it, I should be able to build it.

How many amps will it draw when it is engaged with the vehicle off?

I'm lazy and a noob here.

Anyone have a part# of a relay that has the circuit built in?

It wil energize a solenoid in the transmission that draws very little juice.

Check this diagram out. I thinks this is something you may be looking for.

https://pg.photos.yahoo.com/ph/kreativesailor/detail?.dir=374b&.dnm=d8f4.jpg&.src=ph

I built 3 of this diagrams and as of today they still outthere working. It will alternate your highbeams, fog lights, headlights, etc. when a swithc is pressed. Or can be activated remotely from your alarm aux. (need to have a latching mode aux)