adding horn chirp to keyless system

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=122177
Printed Date: May 15, 2025 at 3:12 AM

Topic: adding horn chirp to keyless system

Posted By: jaketime81
Subject: adding horn chirp to keyless system
Date Posted: June 06, 2010 at 11:35 AM

I need to turn a 1 second + pulse into a shorter chirp.

I ran into a weird situation maybe some one can help me out. I installed an old Viper Remote start/keyless entry system into a 2009 Toyota Tundra. The problem is that the system does not have a horn honk output wire like the newer systems do. So what I did is diode isolated the + lock and unlock wires through a relay to trigger the negative horn honk wire. This solution worked but the lock/unlock wires pulse for 1 second and the horn is soooo loud its abnoxous. So I need to change a 1 second pulse to a smaller pulse.

I thought about using an alarm siren instead of the horn and using a resister to turn the voltage down so it wasn't as loud, but ideally if I could get a chirp sound like the lexus' have, that would be Ideal any suggestions?

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jake

Replies:

Posted By: i am an idiot
Date Posted: June 06, 2010 at 1:42 PM

Any except the first one listed will work for you.

The third from the bottom is probably the best option for you.

https://www.radioshack.com/search/index.jsp?kwCatid=&kw=piezo%20buzzer&origkw=piezo%20buzzer&sr=1

Posted By: topinstaller200
Date Posted: June 08, 2010 at 1:59 AM

relay +552 flasher can = horn honk

siren + output to 85

ground to 86

12v bat to 87

flasher can input to 30

flasher can output to Positive horn at horn not before relay

Posted By: jaketime81
Date Posted: June 14, 2010 at 1:03 PM

The Radio Shack piezo buzzer worked perfectly, Thanks!

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jake