2004 honda accord rear defogger
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=117326
Printed Date: May 19, 2025 at 1:57 PM
Topic: 2004 honda accord rear defogger
Posted By: Wyboy
Subject: 2004 honda accord rear defogger
Date Posted: October 28, 2009 at 5:11 PM
I have a Viper 5101 Remote Start system. It is going in a 2004 Honda Accord. I have located what I believe is the correct rear defogger wire. It is a large BLACK / YELLOW wire which rests at ground and shows 12 volts when the rear defogger button on the dash is activated. Is this the correct way to hook it up using a relay:
85-status output
86-12v
87-12v
30-BLACK / YELLOW defogger wire in vehicle
Thanks.
Replies:
Posted By: KarTuneMan
Date Posted: October 28, 2009 at 7:34 PM
Status output will trigger your defrost everytime you remote start the car. -------------
Posted By: Wyboy
Date Posted: October 28, 2009 at 7:51 PM
I understand that. Is my wiring of the relay correct though?
Posted By: t&t tech
Date Posted: October 28, 2009 at 8:39 PM
I've never installed rear defroster control in a 2004 honda accord, so i can't say if applying voltage directly won't cause any problems, so if i doubt here's a sure way to be safe, Pin 30- Cut that defogger wire in half and connect the side that goes to the glass here Pin 87a- Connect the other side here from the switch Pin 85- status output pin 86- ignition pin 87- Constant fused twelve
Posted By: t&t tech
Date Posted: October 28, 2009 at 8:41 PM
If you know personally that applying voltage directly will not cause any problems, or someone else can confirm this, then yes your diagram is good also! Cheers
Posted By: chriswallace187
Date Posted: October 29, 2009 at 5:58 AM
I would skip the add-on relay altogether. Find the factory defogger relay, use your DMM to identify which is the control terminal (most likely it's 85, and should go to ground with the defogger active).
Once you've done that, just solder the status output to that terminal, taking care that there aren't loose strands of wire that might accidentally short the other relay terminals.
The indicator light on the dash won't come on this way, but you can confirm that it's working if the relay clicks on when the remote start's activated.
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