Viper 790XV Chirping Relay?
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=13682
Printed Date: May 14, 2025 at 7:57 AM
Topic: Viper 790XV Chirping Relay?
Posted By: pinchy
Subject: Viper 790XV Chirping Relay?
Date Posted: May 18, 2003 at 6:24 PM
I was wondering if anyone knows if the Viper 790XV brain uses a chirping relay to do the warn away sound. I'm asking because I hooked up my 508D radar sensor to constant GND, so it's always on and now the warn away doesn't work. The 508D instructions say: "If using the 508D with either a 516T-series voice module or a siren chirping relay, it must be turned off while the system is not armed." All this meaning the 508D must be connected GND when armed for the warn away feature to work. Is this true?
Replies:
Posted By: auex
Date Posted: May 18, 2003 at 7:45 PM
How did you wire the motion sensor to the alarm, specifically the blue and green wire?
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Posted By: jaxman
Date Posted: May 19, 2003 at 6:02 AM
Connect the Black wire of the 508D to the Orange wire of the system and you will have the sensor activated only when the system it is armed.
The answer to AUEX's question it is alos important.
Posted By: pinchy
Date Posted: May 19, 2003 at 7:35 AM
I shorted the blue and green wires of the 508D together then put them into one of the multiplexed inputs of the 790XV. Do you know if the 79-XV has an internal chirping relay, meaning I would have to connect the 508D to a GND when armed output for the warning mode to work? It's a long story, but I had both my 508D and my 507T (tilt/motion) both on the GND when armed line. Including the starter kill relay on that line, all 3 components were drawing more than 500mA, so the sensors were all acting weird. So I moved the 508D off the orange wire, since the 507T has to have it to calibrate the tilt. Now the 508D no longer has the warning mode. I just want to make sure I need it on the GND when armed for the warning mode to work, before I rip everything apart for the 5th time and add a relay to the orange wire to GND the 508D and 507T. Thanks for your help.
Posted By: CutDog504
Date Posted: May 19, 2003 at 11:44 AM
You can hook up all your sensors to a constant ground and you will be fine. The "chirping relay" they are speaking of is an aftermarket relay designed to give prewarning chirps to an alarm that didnt come with that feature. But on a viper, the siren will not chirp unless the alarm is armed, so you have nothing to worry about. You can have all your sensors hook up to a constant ground and the siren will not "accidently chirp" when the alarm is not armed. Go ahead and and put them to a constant ground, you'll be fine.
Posted By: slugger56
Date Posted: May 22, 2003 at 2:12 PM
The 790vx shock sensor has an extra wire connected to it (Green) This wire is used for a sensor such as the 508D. Connect the blue and Green from the sensor together with diodes (Stripe towards 508D) and connect both to the Green wire on the shock sensor plug. Both the Blue and Green wire on this plug are multiplex inputs, which means a pulse shorter that .8 seconds will trigger warn away and a pulse longer than .8 seconds will full trigger the alarm.
Posted By: slugger56
Date Posted: May 22, 2003 at 2:14 PM
By the way, Constant ground on the Field sensor works better and tends to make the 508D more stable.
Posted By: pinchy
Date Posted: May 22, 2003 at 7:15 PM
Thanks for all the help. My 508D seems to work normal like 90% of the time now. On some days, the warning mode seems to die out, but I guess it's no bi deal. I actually tied my green and blue wires on my shock sensor together and did the same to my radar sensor so they could each have their own multiplexed input. This way when a sensor goes off, I can tell which one by the zone 1 and 2 on the remote. I didn't use any diodes in this setup though. Just wondering if I need them if both sensors are isolated from each other since they're on their on mux input.
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