defog wire for 07 honda odyssey

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=118084
Printed Date: May 15, 2025 at 9:25 PM

Topic: defog wire for 07 honda odyssey

Posted By: mark5000
Subject: defog wire for 07 honda odyssey
Date Posted: November 28, 2009 at 9:42 PM

Could anyone tell me which wire will trigger for the rear defogger on a 07 honda odyssey? I push the on/off button and I dont hear any relay clicking under the dash. I have an alarm I would like to control while the van is autostarted. I would like to use the trunk release channel on my alarm to trigger the the rear defogger.

thanks

mark

Replies:

Posted By: i am an idiot
Date Posted: November 28, 2009 at 10:13 PM

This is the note that Audiovox has for the vehicle. THIS VEHICLE USES DATA TO CARRY THE REAR DEFROST SIGNAL FROM THE A/C CONTROL UNIT TO THE UNDER HOOD FUSE/RELAY BOX, MUST USE RELAY AND FUSE AT 30 AMPS

This is the info thay have on the wiring.

Rear Defrost

BLACK / YELLOW

\They do not list a location for the wire. I can only assume that you need to catch it under the OEM relay at the under hood relay/fuse box.

Posted By: mark5000
Date Posted: November 28, 2009 at 10:32 PM

Thanks... what do you mean by the vehicle uses data to carry the rear defrost signal? I cant just trigger it with a relay using + / -

Posted By: i am an idiot
Date Posted: November 28, 2009 at 10:51 PM

They mean that you can not use the wires at the actual defrost switch mounted on or near the ac control unit. That switch sends a data signal to the AC control unit that in turn triggers the under hood relay. I have no idea if you will have problems if you just try to trigger the coil of that reay to get it to come on. I do know that if you use a second relay to apply power to the wire they have listed, there is no way to damage the AC control unit. That wire is isolated from the AC control unit. Groinding or powering the appropriate wire of the coil of the OEM relay could cause problems. Unlikely, but if it were me, the second relay would be the way to go.