Viper 790 XV Additional Modules
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=11884
Printed Date: September 10, 2025 at 1:59 AM
Topic: Viper 790 XV Additional Modules
Posted By: pinchy
Subject: Viper 790 XV Additional Modules
Date Posted: April 06, 2003 at 11:37 PM
I just had the Viper 790XV installed in my car and now I'm trying to add the radar sensor myself. By looking at the installation guide that came with the alarm, it seems like there aren't any open ports to just plug the radar module in. Do I have to splice into the included shock sensor harness to use the same 1st and 2nd stage signal wires? Hmm...I'm guessing this probably isn't the right way to do it since the alarm has those different zone warnings on the remote lcd screen and this way would make everything trigger the same zones. Thanks.
Replies:
Posted By: x6369x
Date Posted: April 07, 2003 at 5:35 PM
If your using a DEI 508D proximity sensor, you can wire in the shock sensor's blue and green to the blue of the alarm, and the prox's blue and green to the green of the alarm. If either sensor detects a warning (green wire), the alarm will emit warning chirps, and if the sensor detects a trigger (blue wire), the alarm will go off.
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Posted By: pinchy
Date Posted: April 07, 2003 at 7:20 PM
Oh, thanks. For some reason, I thought each sensor had individual signals for the 1st and 2nd stages. Does anyone know how these sensors transmit the 2 different signals over 1 wire? Is it like PWM or some analog voltage signal or TTL? Just curious. Thanks again.
Posted By: x6369x
Date Posted: April 07, 2003 at 7:56 PM
The trigger (blue) sends a 1+ second pulse to the alarm, and the warning (green) sends a 0.5 second pulse to the alarm.
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Posted By: auex
Date Posted: April 07, 2003 at 9:38 PM
The shock sensor wiring is multiplexed and looks for two different times, and they are pretty much like what x6369x said.
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Posted By: pinchy
Date Posted: April 08, 2003 at 9:46 PM
Cool to know, thanks for the help. Does anyone know how to set the sentivity on the DEI dual stage shock sensor? I'm guessing it's a variable resistor...but do I turn it clockwise or counterclockwise for more or less? I tried to find out the default setting of the alarm by football tackling my jeep cherokee, but i could never get it to trigger or warn. I wonder how sensitive people set their alarms. I want to lean on the side of being conservative since I got the 790 so I wouldn't have one of those annoying alarms that went off all the time with the owner no where in sight.
Posted By: pinchy
Date Posted: April 08, 2003 at 10:08 PM
Oh, I just read another post about how the shock sensor doesn't respond to shaking, only impacts. Kinda weird...I wouldn't want anyone to hop on my bumper. Do people get the tilt sensor to handle shaking?
Posted By: x6369x
Date Posted: April 11, 2003 at 11:07 PM
The tilt sensor may not work as well as you think. I installed a Clifford tilt sensor in a friends Vette, and I can't get it to go off by rocking the car. There is no sensivity adjustment, only different trigger wires for 1/2 or 1 degree of tilt. The only way I've gotten the sensor to trigger is to set it in my hand, set the alarm, then move the sensor a few degrees. I installed it to Clifford's recommendations, but it still doesn't react to shaking or pushing up and down on the bumpers. I haven't tried a floor jack though.
The DEI shock sensor has 1 potentiometer for adjustment. Clockwise increases the sensivity.
In your situation, I would just increase the warning zone of the proximity sensor, so that if someone walked too close, it would emit the warning chirps.
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