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viper siren output malfunction


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mad_urban 
Member - Posts: 13
Member spacespace
Joined: September 21, 2006
Location: Texas, United States
Posted: November 11, 2012 at 1:55 PM / IP Logged  
I have searched the forum and can't seem to find an answer. I installed a Viper 5704v into a 2007 f-450 wrecker. Everything works fine except the output for the siren wire. When the siren is hooked up as it should be, only a muffled tone comes out, no confirmation chirps, nothing and it stays on constantly. I checked the output with my probe and get no signal, when testing with a volt meter, it reads 12v. No readable change when the unit is armed/disarmed/activated. I have never come across this problem before and can't seem to figure out a solution.
Just a note, the siren does work properly when hooked directly to the battery.
mad_urban 
Member - Posts: 13
Member spacespace
Joined: September 21, 2006
Location: Texas, United States
Posted: November 11, 2012 at 2:03 PM / IP Logged  
When the siren is connected to the output wire, the voltage drops from 12v to about 1.2v and when the alarm is triggered, there is no output from the siren wire and the muffled tone stops.
lurch228 
Silver - Posts: 1,338
Silver spacespace
Joined: August 08, 2012
Posted: November 11, 2012 at 3:40 PM / IP Logged  
Need to check your main power and ground to the alarm. And always run grounds together, ie ground siren to alarm brain ground.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: November 11, 2012 at 3:42 PM / IP Logged  
Or the siren output chip has failed or the siren itself. Connect 12V+ from the battery to the red wire and ground the black.
mad_urban 
Member - Posts: 13
Member spacespace
Joined: September 21, 2006
Location: Texas, United States
Posted: November 11, 2012 at 9:45 PM / IP Logged  
I checked and rechecked all of my connections. The power input is connected directly to a constant in the ignition harness and I made a new ground with a cleaned connection. The siren does work when tested on the truck's battery. I think the circuit may be bad in the unit. Luckily, the truck belongs to a friend of mine, so he was happy with hooking up the horn wire and I gave him a set of truck air horns I had in stock in the back to make it louder for him. He cared more about the remote start function than anything else. If it had been a normal customer, though, I would have had to simply send the brain back.

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