rear defroster 2001 Grand Prix

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=57779
Printed Date: May 10, 2025 at 6:42 AM

Topic: rear defroster 2001 Grand Prix

Posted By: way2real
Subject: rear defroster 2001 Grand Prix
Date Posted: June 15, 2005 at 8:33 PM

I checked the polarity of the white defroster wire and it is negative but the multimeter doesnt ground to 0.0 when I press the defroster button. So my question is would it be safe to hook up the defroster to the -200 mA of the Viper 771xv using a relay as followed?

86 : 12 Volt Constant
87 : Ground
85 : Alarm input channel
30 : white defroster wire
87a: not used

Replies:

Posted By: Tangkilla69
Date Posted: June 16, 2005 at 12:15 AM

As long as you are sure that it is a negetive trigger then that relay setup should work fine. Alot of times a DMM will not read a perfect ground when the switch is turned on, even if it is negetive. Check it using Continuity and Resistance, but just be sure that its not switching to a positive 12volts or you could have a fire. Either way just use an in line fuse just to be safe.

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