Viper 791 rear defrost

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=70723
Printed Date: July 16, 2025 at 9:03 AM

Topic: Viper 791 rear defrost

Posted By: slo-sho
Subject: Viper 791 rear defrost
Date Posted: January 13, 2006 at 11:33 PM

Which wire do I use and how is it controlled?

Replies:

Posted By: Hornshockey
Date Posted: January 14, 2006 at 1:33 AM

do you mean which wire in the car or off the alarm?

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

Posted By: slo-sho
Date Posted: January 14, 2006 at 11:29 AM

Which wire coming off the alarm?

Posted By: mike swanson
Date Posted: January 14, 2006 at 11:34 AM

what kind of car??? Use a bypass mod and it will do it threw the diag plug

Posted By: slo-sho
Date Posted: January 14, 2006 at 10:33 PM

I was told that the 791 can controll the rear defrost but the wire was never hooked up...I would like to k now which wire I should use from the alarm. Also how do I control this output?

Posted By: Hornshockey
Date Posted: January 15, 2006 at 7:40 PM

the 791 has two options for activating the rear defroster. In the 5-pin H3 harness, the blue/white wire is a status output that outputs a negative whenever the remote start is running. The other option is to use your AUX channel 4 or 5, and set it to a latched output.

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Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

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