Got rear defroster to work w/remote start
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=21923
Printed Date: May 12, 2025 at 8:51 PM
Topic: Got rear defroster to work w/remote start
Posted By: cpgoose
Subject: Got rear defroster to work w/remote start
Date Posted: November 25, 2003 at 8:07 AM
What's up.....I hooked up my rear defroster to a separate channel on my alarm/remote starter. I went right to the switch, and I just give it a momentary pulse with a relay, and the defroster comes on for a specific amount of time. The only problem is that the car has to be running for it to work (which I guess is a good thing, too).
What I was trying to do, though, was hook up the remote starter and defroster to one channel on the remote, so both would work from 1 button. The problem is like I said, though....it won't turn on the defroster until the car is remotely started. Is there a way to activate the defroster after the car remotely starts?
Goal: Have channel 5 remotely start the car and have channel 6 remotely start the car and turn on the defroster (so I have the option of not having it on everytime I remotely start the car).
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Replies:
Posted By: 10nesne1
Date Posted: November 25, 2003 at 8:26 AM
you can only have it one way. You can't have it both way unless you have a timed output on channel 6. Normally, I would hookup the rear defroster through a relay on the status output or ground out when arming. It will turn on the rear defroster for as long as the vehilce is running. BTW, most remote starter by default it will run around 10 mins, 15 mins, or 20 mins and unless you change it to run it more than default, is it?
Hopefully, this will help. Good luck.
Posted By: cpgoose
Date Posted: November 25, 2003 at 8:34 AM
Thanks 10nesne1.....yea, I think mine is defaulted to about 10 or 15 minutes. I was just trying to avoid having it running everytime I remotely started. Oh well, I guess I can just leave it on it's own channel.
Yea, I was trying to think of a way to use the status output of the RS to only activate the defroster only when I wanted it to...but I guess that can't happen.
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Posted By: atomsite
Date Posted: November 25, 2003 at 8:36 AM
Too bad you can't AND the defroster with a temp/humidity sensor. Obviously you don't need the defroster on in the summer. Hmm, actually you probably could do this but it would require some work/investigation.
Posted By: cpgoose
Date Posted: November 25, 2003 at 9:29 AM
Murph] wrote:
Buy a new DEI remote start alarm and defroster is built in.
Ok, well that's not really an option.....but even so.....how does that work? Does it turn it on everytime you remote start....or do you have a choice? ------------- Q: What's the best nation in the world?
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Posted By: 10nesne1
Date Posted: November 25, 2003 at 11:36 AM
I read the DEI remote start and defroster is built in. You will need a relay to hookup a relay and program it to latch or pulsed. Latched for 10 mins or plused to 10 mins. It only works one way when vehicle started and in the summer the defroster stay on.
You don't have any choice. But this DEI (Clifford Matrix RSX3.5) alarm starter have a channel 4 output can be programmed to Latch output. This will work on your application.
Hopefully, this will help if you decided to upgrade.
Posted By: kenmci
Date Posted: November 25, 2003 at 12:05 PM
you could hook up the defroster to the so that when the car is started it will run, the you could break the ground when running wire that goes to the defroster with a latched relay that is hooked up to channel 6 so that when you remote start it the defroster will not come on unless you activate channel six, but if you activate channel 6 the defroster wouldn't come on unless the car is started. It's a little different then you wanted, but you could remote start it without the defroster coming on.
Posted By: G4UK
Date Posted: November 25, 2003 at 5:00 PM
Hi from sunny Yorkshire UK. This shouldn't pose a problem for a competent installer, in the past i've used various timers for a wide range of applications. Look at one of the electronics hobby stores for a delay timer, some of these have various functions such as delayed trigger or variable timed output via pots on the circuit board or build one round one of the many IC timers such as the old faithful 555 this can be configured to do virtually anything. Good Luck. G4UK
Posted By: the12volt
Date Posted: November 25, 2003 at 5:28 PM
If you do not need to turn off the remote start by the remote once it's started, you can use the same channel you used to activate the remote start to activate the defroster by adding a relay that is activated by the shock sensor bypass output from the remote start. Once the vehicle is started remotely, activating the same channel again will turn on the defroster. -------------  the12volt • Support the12volt.com
Posted By: JWorm
Date Posted: November 25, 2003 at 9:08 PM
Haven't done the rear defroster yet on any of the DEI systems I have installed. But when I do, I will Install a summer/winter switch on the trigger wire for the rear defroster. In the summer, turn it off so the defroster doesn't turn it on. Come winter, turn it back on. Customer will only have to hit the switch twice a year....not a big deal.
Posted By: mobiletoys2002
Date Posted: November 25, 2003 at 9:22 PM
good idea,i lik ethe switch but i was thinking of making a temperature module to clik my relay on when needed. actually i tried it today and it worked great .
when it is hot my relay turn on lead is open but when cold it automaticaly closes. 
Posted By: cpgoose
Date Posted: November 26, 2003 at 7:13 AM
Wow, thanks for all of the replies.....
The defroster option is working great nonetheless. I'm just being lazy by wanting to have it this way.
This morning was a bad one for frost, so I remotely started, waited for it to start, and then hit the next button for the defroster....and when I came out the entire back window was clear. Excellent. I just wish the front defroster worked as fast 
JWORM - I was thinking of hooking up that type of switch, too, so it would always turn on the rear defroster as long as that switch is on. But even so, there are times when I don't want it to go on, even in the cold. I can just hear my car strain when I put on the rear defroster, so I'm going to only try and use it when needed. ------------- Q: What's the best nation in the world?
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Posted By: cpgoose
Date Posted: November 26, 2003 at 7:19 AM
G4UK - Thanks, maybe I'll look into one of those.
KENMCI - I'm not quite sure I follow.....I think you're missing a word towards the beginning of your post. "you could hook up the defroster to the ____"
the12volt - Well, that's sort of how I have it now....I have the defroster on its own channel. What I'm trying to attempt is to have 1 channel for just the remote starter, and then a 2nd channel for both the remote starter AND the rear defroster.....this way I have the option of starting with or without it. ------------- Q: What's the best nation in the world?
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Posted By: the12volt
Date Posted: November 26, 2003 at 10:47 AM
Hi cpgoose, what I suggested uses only one channel to activate both the remote starter and the defroster and gives you the option of turning the defroster on when you want to. While this doesn't eliminate a step to operate it, it does free up a channel for you to use for something else. You could also add a switch to prevent the coil of the added relay from energizing so you can use the same channel to turn off the remote starter during the warmer months instead of turning on the defroster. However, if the accessory lead does not show 12V+ until after the vehicle is remotely started, I believe it can be done like you want with as little as three diodes and three relays. Measure the accessory lead to verify that it only shows 12V+ after the vehicle has started remotely and let me know if you are providing a negative or positive pulse to turn on the defroster and I'll try to draw a diagram for you sometime today. ------------- the12volt • Support the12volt.com
Posted By: cpgoose
Date Posted: November 26, 2003 at 11:00 AM
Thanks 12volt, I appreciate it.
I'm not really concerned with the channel, though, because I have a channel expander...so I have extra channels. That's why I was aiming towards using 2 channels, 1 for both, and 1 for just RS. It would sort of be like having the option of the "switch", but on my remote instead :-)
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Posted By: the12volt
Date Posted: November 26, 2003 at 8:33 PM
You're welcome. When you get a chance, verify the accessory lead as I described above and let me know if you are using a positive or negative pulse to turn on the defroster. ------------- the12volt • Support the12volt.com
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