Using car horn with alarm system

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swishs2k10

Member - Posts: 4

Joined: May 28, 2015

Posted: May 28, 2015 at 7:44 PM / IP Logged

Can some walk me through connecting a relay to my car alarm system so I can use my car horn instead of siren.

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swishs2k10

Member - Posts: 4

Joined: May 28, 2015

Posted: May 28, 2015 at 7:44 PM / IP Logged

Ford Expedition

2003

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davep.

Gold - Posts: 641

Joined: May 27, 2011

Location: California, United States

Posted: May 28, 2015 at 8:37 PM / IP Logged

You didn't say which alarm, but if it's a DEI, most of them can be programed for "horn honk" on the siren wire. There's a 6 or 8 pin connector at the base of the steering column. Dk blue wire pin 6 (-) trigger is horn. Test, to be sure. DEI sends a (-) pulse, and the dk blu accepts it. No relay required.

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swishs2k10

Member - Posts: 4

Joined: May 28, 2015

Posted: May 28, 2015 at 9:37 PM / IP Logged

I'm using a viper 5000 car alarm system. That's been installed for a while now. I know the location of the blue wire and I tested it today with a tester. So are you saying I don't need this relay?

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davep.

Gold - Posts: 641

Joined: May 27, 2011

Location: California, United States

Posted: May 28, 2015 at 9:50 PM / IP Logged

Yes, you WILL need a relay for the 5000. It only has the brown (+) siren output. Program 3-1 to "horn honk".

wire the relay as follows:

30 = Ground

87 = Horn blue wire @ steering column.

85 = Ground

86 = Brown siren/horn honk output from 5000.

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swishs2k10

Member - Posts: 4

Joined: May 28, 2015

Posted: May 29, 2015 at 11:24 AM / IP Logged

Thank you very much. I was able to wire my relay up and the car horn works perfect.

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