how do rear defrost buttons work?
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=112820
Printed Date: May 15, 2024 at 6:09 AM
Topic: how do rear defrost buttons work?
Posted By: sofakingslow
Subject: how do rear defrost buttons work?
Date Posted: March 31, 2009 at 4:27 PM
Are they simple on/off buttons, or do they "time out"?
The reason I ask is this: I want to get rid of my ignition cylinder, key and all. I plan to use the Defrost button for the first (ACC) position, the cruise control "set" button and this relay setup for the second (IGN) position, and a Honda S2000 starter button in the original cylinder location for the third (START) position.
Other info: Rear defroster was scraped off the window by previous owner. The wiper switch was broken, so I replaced it with one that has a rear wiper switch. Could I possibly use the rear wiper switch for the first position?
Replies:
Posted By: sofakingslow
Date Posted: March 31, 2009 at 4:28 PM
Forgot most basic info... Vehicle is '89 Honda Civic Hatchback. No rear wiper.
Posted By: i am an idiot
Date Posted: March 31, 2009 at 5:19 PM
There are different types. Most are momentary switches that turn on a controller. If you are willing to remove the switch and do a little footwork with a meter, I can help you figure out what type you have.
Posted By: tedmond
Date Posted: March 31, 2009 at 5:46 PM
i am an idiot wrote:
There are different types. Most are momentary switches that turn on a controller. If you are willing to remove the switch and do a little footwork with a meter, I can help you figure out what type you have.
just incase you didnt read the post, he doesnt want to get his defroster working, he wants to get rid of the ignition cylinder so he can have a push button start. I said the same thing, pull out the meter and ill show you how it works. After re reading the post, now i understand :p to the thread starter - if you search the forum, wiring up a push button as a start is very simple, but to make differant buttons in the car to create a start sequence is not easy. also i dont know how your going to diable the ignition switch without having the steering wheel locking up.
Posted By: i am an idiot
Date Posted: March 31, 2009 at 6:12 PM
I am planning on having to use the 4 relay latching relay on this site.
Posted By: sofakingslow
Date Posted: March 31, 2009 at 7:16 PM
Tedmond - The column lock will be removed with the ignition cylinder.
IAAI - Four relay latching relay? I don't follow... Unless you are counting the number of relays in total that I need. ACC=1 Ign=2 Start=1
Posted By: i am an idiot
Date Posted: March 31, 2009 at 7:56 PM
If the rear defrost button is a momentary switch (which I am betting it is) you will need a latching relay setup. Look Here
Posted By: howie ll
Date Posted: April 01, 2009 at 3:13 AM
Sofakingslow, you need to contact Kevin P. on this one, he's the expert, personally I'd run a mile from this.
Posted By: tedmond
Date Posted: April 01, 2009 at 7:02 PM
howie ll wrote:
Sofakingslow, you need to contact Kevin P. on this one, he's the expert, personally I'd run a mile from this.
run a mile FTW !!
Posted By: i am an idiot
Date Posted: April 01, 2009 at 7:42 PM
He isn't even trying to use anything wireless. Why are you guys telling him to run. This will be a simple project. His defrost button may be a latching switch. If that is the case it will be a piece of cake. Obviously he is not scared of relays. So even if it is a momentary switch, the simple latching relay is all he would need for Ignition and possibly for accessory. Other than the 4 relay latching relay possibilities, I really have no idea what he should run from.
Posted By: sofakingslow
Date Posted: April 01, 2009 at 10:20 PM
i am an idiot wrote:
Obviously he is not scared of relays. So even if it is a momentary switch, the simple latching relay is all he would need for Ignition and possibly for accessory. Other than the 4 relay latching relay possibilities, I really have no idea what he should run from.
I have done this before, only using rocker switches and a generic push-button start. All mounted on a piece of sheet metal resting on the exhaust hump. Worked great, up until the positive terminal made contact with the floorboard...
The only thing that really concerns me is this not working the first time I try it. Which brings to mind: As a new Mac convert, what program can i use to draw a schematic? I need someone to go over my wiring and connections before I actually begin this project.
I take it wireless applications are Kevin P's specialty?
Posted By: i am an idiot
Date Posted: April 02, 2009 at 2:33 AM
If you are using a Mac, I have no idea what you can draw with. Maybe a pencil and paper and a digital camera.
Posted By: howie ll
Date Posted: April 02, 2009 at 3:05 AM
OK so I over reacted, the defrost switch itself can be momentary or latching depending on testing, the same aplies to the rear wash/wipe switch mentioned, what vehicle are we talking about here? My Crystal Ball says Civic/Golf
Posted By: i am an idiot
Date Posted: April 02, 2009 at 3:09 AM
Vehicle is '89 Honda Civic Hatchback. No rear wiper.
Posted By: tedmond
Date Posted: April 02, 2009 at 6:49 AM
" plan to use the Defrost button for the first (ACC) position, the cruise control "set" button and this relay setup for the second (IGN) position, and a Honda S2000 starter button in the original cylinder location for the third (START) position" he is tapping into other electrical parts of the car to create a start sequence. if it was just switches then thats no biggie, but using cruise control to allow ignition power? if something happened to the ignition on the highway, then your in trouble. relays dont often fail, but if they did for somereason then problems arise.
Posted By: howie ll
Date Posted: April 02, 2009 at 6:54 AM
Sorry I just guessed at Civic but then I've done this whole post not reading it properly, what do you expect I'm going Cold Turkey on Cigs after 45 yrs! 
Posted By: tedmond
Date Posted: April 02, 2009 at 7:01 AM
ahah hey howie, should lay off the smokes. correct me if im wrong. civics has a button to enable cruise control. That turns on the CC system, but the set button does not actually have continuity to the CC computer until its around 45km/h (about 25m/h) so if the car is sitting still, there is no voltage running through the SET button. so how do you plan on powering ignition. are you planning on just running a power wire through the set switch to a relay?
Posted By: i am an idiot
Date Posted: April 02, 2009 at 8:25 PM
I am sure he plans on using only the switch and not the cruise control brain. Hey Howie, I have faith in you and know you can do it. Don't let me down.
Posted By: sofakingslow
Date Posted: April 02, 2009 at 11:27 PM
Tedmond - Exactly. The power steering controls are actually integrated into the steering wheel of the 89 Integra, which I have already put in my car.
Howie - I need to quit, too. Costs too much, in terms of money and quality of life. Funds could be better spent elsewhere. More money for toys!
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