Momentary to const question: for defrost

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cpgoose

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Posted: October 14, 2003 at 12:55 PM / IP Logged

Hi,

I was researching on how to do this, but I'm a little confused. The alarm has an AUX output that's not being used, but it's only a 1/2 second long. I'd like to extend this to be constant so that they can turn on their rear defroster.

I guess I'm a little confused on how to turn this off. I'd like it to turn off say when they get in and turn the key, and hit the brake to change gear. So can I do it off of the brake's (+) wire? Do I need yet another relay to turn it off? Or maybe I can use the switched 12+ somehow?

Here's the picture I'm talking about:

Momentary to const question: for defrost -- posted image.

By the way, if you know what wire to use for the rear defroster in a '98 Sienna, that would be cool, too.

Thanks!!!

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cpgoose

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Posted: October 16, 2003 at 11:37 AM / IP Logged

If I use the accessory output of the remote start satellite (that I wasn't going to use) as my constant feed to the rear defroster, could I get this to work somehow?

Please help! I want the van out of garage! Momentary to const question: for defrost -- posted image.

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Posted: October 16, 2003 at 12:02 PM / IP Logged

To turn off the relay configuration above, you need to either break ground or interupt 12V+ to the second relay. If you use the accessory output of the remote start, there's no need for the relay configuration above to power the rear defroster, just one relay to provide enough current and/or change polarity of the output from the remote start.

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cpgoose

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Posted: October 16, 2003 at 12:14 PM / IP Logged

Well, I was trying to make it so the remote's AUX channel could turn on the rear defroster while the car was remotely running. But since her remote does not have a latched output, I wasn't sure how to make her AUX channel keep the rear defroster running. In other words, I need a constant signal. I guess I was thinking I could use the ACC from the remote start to act as the constant signal, but I guess that's wrong.

Hmmm....if only the rear defroster button only needed a quick pulse, which would keep it on. If you hit the button in the car, it will turn on. But if you turn the ignition off and on again, the rear defrost button will be off again. Do you think if I gave it a quick pulse when the car was remotely running, that would act as if someone were hitting the button in the car?

Thanks for the help 12volt. It's nice to have a question answered after attempting to answer so many other ones. Momentary to const question: for defrost -- posted image.

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xetmes

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Posted: October 16, 2003 at 12:52 PM / IP Logged

i dont get it, does this vehice have a montary button to enable the defroster or is it some kind of latching switch, i think most are momentary because they switch off after a certain amount of time to prevent damage if turned on in hot weather.

If it is momentary why not just go to the back of the switch and use the two sides of a relay to act as triggering the button, the same way you would if you pushed the button?

If not you could use an SCR, once it recieves power (your aux output) it will remain on until it loses power..

i would favor the first idea much more though...

cpgoose

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Posted: October 16, 2003 at 12:59 PM / IP Logged

Yea, the vehicle has a momentary switch one like you described. I wasn't sure how to keep it on since the output of the alarm is only pulsed (1/2 second).

That would be awesome to use a relay to act like it's activating the switch...how do you wire that up? Don't you still need a constant signal (from the alarm) to keep the switch depressed....or do you just need a quick pulse, as if you're hitting the button on the dash.

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cpgoose

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Posted: October 16, 2003 at 1:42 PM / IP Logged

So can I do something like this?....assuming that the rear defroster has 2 wires. If it has more than that, how will I determine which 2 to use?

Thanks guys!

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xetmes

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Posted: October 16, 2003 at 4:11 PM / IP Logged

yea thats what i mean assuming just 2 wires, pull the switch out and take a look, do some measurements with a meter to determine if that will work, always want to use the least invasive technique if it will work...

also throw a diode on that coil Momentary to const question: for defrost -- posted image.

cpgoose

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Posted: October 17, 2003 at 9:54 AM / IP Logged

Ok, I got a couple of schematics from Toyota....hopefully this will help. Although I still can't really tell what the wire colors are by the fuse panel. But I think I got a schematic of the switch. Here's what it says:

2 - GROUND - Approximately 12volts with the ignition switch on

3 - GROUND - Always continuity

6 - GROUND - Continuity with the defogger switch ON and approximately 15 minutes thereafter

So can you tell from that which two wires I need to connect in order for the switch to turn on? Or do I just need to pulse power to #2. Hmmm, I don't think that's right, I think I need to connect two wires like you were saying.

Here's the diagram of the switch.

EDIT: Ok, I was able to get to the switch and the wiring behind it, and it looks just like the diagram provided (go figure:). So, do you think that when it says GROUND for those three wires, does that mean it rests at ground? And then with the Ignition switch on, (for position #2) it will show 12v+. So basically, I just need to give continuity between two wires, but I'm not sure which.

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xetmes

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Posted: October 17, 2003 at 1:19 PM / IP Logged

is there a way you can disconnect the switch and measure to see what happens when it is pressed?

The thing i dont understand is that you say "Continuity with the defogger switch ON and approximately 15 minutes thereafter" it stays at ground for 15 min then stops? thats how i am reading this...

my assumption would be the switch causes 12V to 6, but thats purely a guess, i would really recommend removing the swich if possible and measuring what happens when pressed... does it look like it is just a button or does it appear to have some extra electronics with it?

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